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QC2 and checklist edits

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Clare Laylock 2023-11-01 11:02:42 -04:00
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@ -1,6 +1,7 @@
[[satoshi_whitepaper]] [[satoshi_whitepaper]]
[appendix] [appendix]
== The Bitcoin Whitepaper by Satoshi Nakamoto == The Bitcoin Whitepaper [.keep-together]#by Satoshi Nakamoto#
[NOTE] [NOTE]
==== ====

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@ -2,7 +2,7 @@
[appendix] [appendix]
== Bitcoin Improvement Proposals == Bitcoin Improvement Proposals
Bitcoin Improvement Proposals are design documents providing information to the Bitcoin community, or for describing a new feature for Bitcoin or its processes or environment. Bitcoin Improvement Proposals are design documents providing information to the Bitcoin community or describing a new feature for Bitcoin or its processes or environment.
As per BIP1 _BIP Purpose and Guidelines_, there are three((("BIPs (Bitcoin Improvement Proposals)", "types of"))) kinds of BIPs: As per BIP1 _BIP Purpose and Guidelines_, there are three((("BIPs (Bitcoin Improvement Proposals)", "types of"))) kinds of BIPs:
@ -30,37 +30,37 @@ BIPs that are ((("BIPs (Bitcoin Improvement Proposals)", "implemented by Bitcoin
- BIP31: The 'pong' protocol message (and the protocol version bump to 60001) has been implemented since v0.6.1 (PR #1081). - BIP31: The 'pong' protocol message (and the protocol version bump to 60001) has been implemented since v0.6.1 (PR #1081).
- BIP32: Hierarchical Deterministic Wallets has been implemented since v0.13.0 (PR #8035). - BIP32: Hierarchical Deterministic Wallets has been implemented since v0.13.0 (PR #8035).
- BIP34: The rule that requires blocks to contain their height (number) in the coinbase input, and the introduction of version 2 blocks has been implemented since v0.7.0. The rule took effect for version 2 blocks as of block 224413 (March 5th 2013), and version 1 blocks are no longer allowed since block 227931 (March 25th 2013) (PR #1526). - BIP34: The rule that requires blocks to contain their height (number) in the coinbase input, and the introduction of version 2 blocks has been implemented since v0.7.0. The rule took effect for version 2 blocks as of block 224413 (March 5th 2013), and version 1 blocks are no longer allowed since block 227931 (March 25th 2013) (PR #1526).
- BIP35: The 'mempool' protocol message (and the protocol version bump to 60002) has been implemented since v0.7.0 (PR #1641). As of v0.13.0, this is only available for NODE_BLOOM (BIP111) peers. - BIP35: The 'mempool' protocol message (and the protocol version bump to 60002) has been implemented since v0.7.0 (PR #1641). As of v0.13.0, this is only available for +NODE_BLOOM+ (BIP111) peers.
[role="less_space pagebreak-before"] [role="less_space pagebreak-before"]
- BIP37: The bloom filtering for transaction relaying, partial Merkle trees for blocks, and the protocol version bump to 70001 (enabling low-bandwidth lightweight clients) has been implemented since v0.8.0 (PR #1795). Disabled by default since v0.19.0, can be enabled by the -peerbloomfilters option. - BIP37: The bloom filtering for transaction relaying, partial Merkle trees for blocks, and the protocol version bump to 70001 (enabling low-bandwidth lightweight clients) has been implemented since v0.8.0 (PR #1795). Disabled by default since v0.19.0, can be enabled by the +-peerbloomfilters+ option.
- BIP42: The bug that would have caused the subsidy schedule to resume after block 13440000 was fixed in v0.9.2 (PR #3842). - BIP42: The bug that would have caused the subsidy schedule to resume after block 13440000 was fixed in v0.9.2 (PR #3842).
- BIP43: The experimental descriptor wallets introduced in v0.21.0 by default use the Hierarchical Deterministic Wallet derivation proposed by BIP43. (PR #16528) - BIP43: The experimental descriptor wallets introduced in v0.21.0 by default use the Hierarchical Deterministic Wallet derivation proposed by BIP43 (PR #16528).
- BIP44: The experimental descriptor wallets introduced in v0.21.0 by default use the Hierarchical Deterministic Wallet derivation proposed by BIP44. (PR #16528) - BIP44: The experimental descriptor wallets introduced in v0.21.0 by default use the Hierarchical Deterministic Wallet derivation proposed by BIP44 (PR #16528).
- BIP49: The experimental descriptor wallets introduced in v0.21.0 by default use the Hierarchical Deterministic Wallet derivation proposed by BIP49. (PR #16528) - BIP49: The experimental descriptor wallets introduced in v0.21.0 by default use the Hierarchical Deterministic Wallet derivation proposed by BIP49 (PR #16528).
- BIP61: The 'reject' protocol message (and the protocol version bump to 70002) was added in v0.9.0 (PR #3185). Starting v0.17.0, whether to send reject messages can be configured with the -enablebip61 option, and support is deprecated (disabled by default) as of v0.18.0. Support was removed in v0.20.0 (PR #15437). - BIP61: The 'reject' protocol message (and the protocol version bump to 70002) was added in v0.9.0 (PR #3185). Starting v0.17.0, whether to send reject messages can be configured with the ++-enablebip61++ option, and support is deprecated (disabled by default) as of v0.18.0. Support was removed in v0.20.0 (PR #15437).
- BIP65: The CHECKLOCKTIMEVERIFY soft fork was merged in v0.12.0 (PR #6351), and backported to v0.11.2 and v0.10.4. Mempool-only CLTV was added in PR #6124. - BIP65: The ++CHECKLOCKTIMEVERIFY++ soft fork was merged in v0.12.0 (PR #6351), and backported to v0.11.2 and v0.10.4. Mempool-only +CLTV+ was added in PR #6124.
- BIP66: The strict DER rules and associated version 3 blocks have been implemented since v0.10.0 (PR #5713). - BIP66: The strict DER rules and associated version 3 blocks have been implemented since v0.10.0 (PR #5713).
- BIP68: Sequence locks have been implemented as of v0.12.1 (PR #7184), and have been buried since v0.19.0 (PR #16060). - BIP68: Sequence locks have been implemented as of v0.12.1 (PR #7184), and have been buried since v0.19.0 (PR #16060).
- BIP70 71 72: Payment Protocol support has been available in Bitcoin Core GUI since v0.9.0 (PR #5216). Support can be optionally disabled at build time since v0.18.0 (PR 14451), and it is disabled by default at build time since v0.19.0 (PR #15584). It has been removed as of v0.20.0 (PR 17165). - BIP70 71 72: Payment Protocol support has been available in Bitcoin Core GUI since v0.9.0 (PR #5216). Support can be optionally disabled at build time since v0.18.0 (PR 14451), and it is disabled by default at build time since v0.19.0 (PR #15584). It has been removed as of v0.20.0 (PR 17165).
- BIP84: The experimental descriptor wallets introduced in v0.21.0 by default use the Hierarchical Deterministic Wallet derivation proposed by BIP84. (PR #16528) - BIP84: The experimental descriptor wallets introduced in v0.21.0 by default use the Hierarchical Deterministic Wallet derivation proposed by BIP84. (PR #16528)
- BIP86: Descriptor wallets by default use the Hierarchical Deterministic Wallet derivation proposed by BIP86 since v23.0 (PR #22364). - BIP86: Descriptor wallets by default use the Hierarchical Deterministic Wallet derivation proposed by BIP86 since v23.0 (PR #22364).
- BIP90: Trigger mechanism for activation of BIPs 34, 65, and 66 has been simplified to block height checks since v0.14.0 (PR #8391). - BIP90: Trigger mechanism for activation of BIPs 34, 65, and 66 has been simplified to block height checks since v0.14.0 (PR #8391).
- BIP111: NODE_BLOOM service bit added and enforced for all peer versions as of v0.13.0 (PR #6579 and PR #6641). - BIP111: +NODE_BLOOM+ service bit added and enforced for all peer versions as of v0.13.0 (PR #6579 and PR #6641).
- BIP112: The CHECKSEQUENCEVERIFY opcode has been implemented since v0.12.1 (PR #7524), and has been buried since v0.19.0 (PR #16060). - BIP112: The +CHECKSEQUENCEVERIFY+ opcode has been implemented since v0.12.1 (PR #7524), and has been buried since v0.19.0 (PR #16060).
- BIP113: Median time past lock-time calculations have been implemented since v0.12.1 (PR #6566), and has been buried since v0.19.0 (PR #16060). - BIP113: Median time past lock-time calculations have been implemented since v0.12.1 (PR #6566), and has been buried since v0.19.0 (PR #16060).
- BIP125: Opt-in full replace-by-fee signaling partially implemented. See doc/policy/mempool-replacements.md. - BIP125: Opt-in full replace-by-fee signaling partially implemented.
- BIP130: direct headers announcement is negotiated with peer versions >=70012 as of v0.12.0 (PR 6494). - BIP130: direct headers announcement is negotiated with peer versions 70012 as of v0.12.0 (PR 6494).
- BIP133: feefilter messages are respected and sent for peer versions >=70013 as of v0.13.0 (PR 7542). - BIP133: feefilter messages are respected and sent for peer versions 70013 as of v0.13.0 (PR 7542).
- BIP141: Segregated Witness (Consensus Layer) as of v0.13.0 (PR 8149), defined for mainnet as of v0.13.1 (PR 8937), and buried since v0.19.0 (PR #16060). - BIP141: Segregated Witness (Consensus Layer) as of v0.13.0 (PR 8149), defined for mainnet as of v0.13.1 (PR 8937), and buried since v0.19.0 (PR #16060).
- BIP143: Transaction Signature Verification for Version 0 Witness Program as of v0.13.0 (PR 8149), defined for mainnet as of v0.13.1 (PR 8937), and buried since v0.19.0 (PR #16060). - BIP143: Transaction Signature Verification for Version 0 Witness Program as of v0.13.0 (PR 8149), defined for mainnet as of v0.13.1 (PR 8937), and buried since v0.19.0 (PR #16060).
- BIP144: Segregated Witness as of 0.13.0 (PR 8149). - BIP144: Segregated Witness as of 0.13.0 (PR 8149).
- BIP145: getblocktemplate updates for Segregated Witness as of v0.13.0 (PR 8149). - BIP145: getblocktemplate updates for Segregated Witness as of v0.13.0 (PR 8149).
- BIP147: NULLDUMMY soft fork as of v0.13.1 (PR 8636 and PR 8937), buried since v0.19.0 (PR #16060). - BIP147: +NULLDUMMY+ soft fork as of v0.13.1 (PR 8636 and PR 8937), buried since v0.19.0 (PR #16060).
- BIP152: Compact block transfer and related optimizations are used as of v0.13.0 (PR 8068). - BIP152: Compact block transfer and related optimizations are used as of v0.13.0 (PR 8068).
- BIP155: The 'addrv2' and 'sendaddrv2' messages which enable relay of Tor V3 addresses (and other networks) are supported as of v0.21.0 (PR 19954). - BIP155: The 'addrv2' and 'sendaddrv2' messages which enable relay of Tor V3 addresses (and other networks) are supported as of v0.21.0 (PR 19954).
- BIP157 158: Compact Block Filters for Light Clients can be indexed as of v0.19.0 (PR #14121) and served to peers on the P2P network as of v0.21.0 (PR #16442). - BIP157 158: Compact Block Filters for Light Clients can be indexed as of v0.19.0 (PR #14121) and served to peers on the P2P network as of v0.21.0 (PR #16442).
- BIP159: The NODE_NETWORK_LIMITED service bit is signalled as of v0.16.0 (PR 11740), and such nodes are connected to as of v0.17.0 (PR 10387). - BIP159: The +NODE_NETWORK_LIMITED+ service bit is signalled as of v0.16.0 (PR 11740), and such nodes are connected to as of v0.17.0 (PR 10387).
- BIP173: Bech32 addresses for native Segregated Witness outputs are supported as of v0.16.0 (PR 11167). Bech32 addresses are generated by default as of v0.20.0 (PR 16884). - BIP173: Bech32 addresses for native Segregated Witness outputs are supported as of v0.16.0 (PR 11167). Bech32 addresses are generated by default as of v0.20.0 (PR 16884).
- BIP174: RPCs to operate on Partially Signed Bitcoin Transactions (PSBT) are present as of v0.17.0 (PR 13557). - BIP174: RPCs to operate on Partially Signed Bitcoin Transactions (PSBT) are present as of v0.17.0 (PR 13557).
- BIP176: Bits Denomination [QT only] is supported as of v0.16.0 (PR 12035). - BIP176: Bits Denomination [QT only] is supported as of v0.16.0 (PR 12035).
@ -70,4 +70,4 @@ BIPs that are ((("BIPs (Bitcoin Improvement Proposals)", "implemented by Bitcoin
- BIP350: Addresses for native v1+ segregated Witness outputs use bech32m instead of bech32 as of v22.0 (PR 20861). - BIP350: Addresses for native v1+ segregated Witness outputs use bech32m instead of bech32 as of v22.0 (PR 20861).
- BIP371: Taproot fields for PSBT as of v24.0 (PR 22558). - BIP371: Taproot fields for PSBT as of v24.0 (PR 22558).
- BIP380 381 382 383 384 385: Output Script Descriptors, and most of Script Expressions are implemented as of v0.17.0 (PR 13697). - BIP380 381 382 383 384 385: Output Script Descriptors, and most of Script Expressions are implemented as of v0.17.0 (PR 13697).
- BIP386: tr() Output Script Descriptors are implemented as((("BIPs (Bitcoin Improvement Proposals)", "implemented by Bitcoin Core", startref="bips-implement")))((("Bitcoin Core", "BIPs implemented by", startref="bitcoin-core-bips"))) of v22.0 (PR 22051). - BIP386: +tr()+ Output Script Descriptors are implemented as((("BIPs (Bitcoin Improvement Proposals)", "implemented by Bitcoin Core", startref="bips-implement")))((("Bitcoin Core", "BIPs implemented by", startref="bitcoin-core-bips"))) of v22.0 (PR 22051).

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@ -9,5 +9,5 @@
<p>As a bitcoin entrepreneur, Andreas has founded a number of Bitcoin businesses and launched several community open source projects. He serves as an advisor to several bitcoin and cryptocurrency companies. He is a widely published author of articles and blog posts on bitcoin, a permanent host on the popular Lets Talk Bitcoin podcast, and a frequent speaker at technology and security conferences worldwide.</p> <p>As a bitcoin entrepreneur, Andreas has founded a number of Bitcoin businesses and launched several community open source projects. He serves as an advisor to several bitcoin and cryptocurrency companies. He is a widely published author of articles and blog posts on bitcoin, a permanent host on the popular Lets Talk Bitcoin podcast, and a frequent speaker at technology and security conferences worldwide.</p>
<p><strong>David A. Harding</strong> is a technical writer focused on creating documentation for open source software. He is the coauthor of the Bitcoin Optech weekly newsletter (201823), 21.co Bitcoin Computer tutorials (201517), and Bitcoin.org developer documentation (201415). He is also a Brink.dev grant committee member (202223) and former board member (202022).</p> <p><strong>David A. Harding</strong> is a technical writer focused on creating documentation for open source software. He is the coauthor of the Bitcoin Optech weekly newsletter (20182023), 21.co Bitcoin Computer tutorials (20152017), and Bitcoin.org developer documentation (20142015). He is also a Brink.dev grant committee member (20222023) and former board member (20202022).</p>
</section> </section>

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@ -374,7 +374,7 @@ nodes (called "peers"), consuming upload internet bandwidth. If your
internet connection is limited, has a low data cap, or is metered internet connection is limited, has a low data cap, or is metered
(charged by the gigabit), you should probably not run a Bitcoin node on (charged by the gigabit), you should probably not run a Bitcoin node on
it, or run it in a way that constrains its bandwidth (see it, or run it in a way that constrains its bandwidth (see
<<constrained_resources>>). You may connect your node instead to an <<bitcoincorenode_config>>). You may connect your node instead to an
alternative network, such as a free satellite data provider like alternative network, such as a free satellite data provider like
https://oreil.ly/cIwf3[Blockstream Satellite]. https://oreil.ly/cIwf3[Blockstream Satellite].
@ -390,7 +390,7 @@ transactions or update account balances until the full blockchain
dataset is downloaded. Make sure you have enough disk space, bandwidth, dataset is downloaded. Make sure you have enough disk space, bandwidth,
and time to complete the initial synchronization. You can configure and time to complete the initial synchronization. You can configure
Bitcoin Core to reduce the size of the blockchain by discarding old Bitcoin Core to reduce the size of the blockchain by discarding old
blocks (see <<constrained_resources>>), but it will still download the blocks, but it will still download the
entire dataset. entire dataset.
==== ====
@ -423,6 +423,7 @@ If you're reading this book and interested in strong security, superior
privacy, or developing Bitcoin software, you should be running your ((("Bitcoin Core", "nodes", "running", startref="bitcoin-core-nodes-running")))((("nodes", "running", startref="nodes-running")))((("running nodes", startref="running-nodes")))own privacy, or developing Bitcoin software, you should be running your ((("Bitcoin Core", "nodes", "running", startref="bitcoin-core-nodes-running")))((("nodes", "running", startref="nodes-running")))((("running nodes", startref="running-nodes")))own
node. node.
[[bitcoincorenode_config]]
=== Configuring the Bitcoin Core Node === Configuring the Bitcoin Core Node
Bitcoin Core will((("Bitcoin Core", "nodes", "configuring", id="bitcoin-core-nodes-configure")))((("nodes", "configuring", id="nodes-configure")))((("configuring", "nodes", id="configure-nodes"))) look for a Bitcoin Core will((("Bitcoin Core", "nodes", "configuring", id="bitcoin-core-nodes-configure")))((("nodes", "configuring", id="nodes-configure")))((("configuring", "nodes", id="configure-nodes"))) look for a
@ -813,11 +814,11 @@ returned by +getrawtransaction+ and paste it as a parameter to
++++ ++++
<pre data-type="programlisting"> <pre data-type="programlisting">
$ bitcoin-cli decoderawtransaction 01000000000101eb3ae38f27191aa5f3850dc9cad0&#x21b5; $ bitcoin-cli decoderawtransaction 01000000000101eb3ae38f27191aa5f3850dc9cad0\
0492b88b72404f9da135698679268041c54a0100000000ffffffff02204e00000000000022512&#x21b5; 0492b88b72404f9da135698679268041c54a0100000000ffffffff02204e00000000000022512\
03b41daba4c9ace578369740f15e5ec880c28279ee7f51b07dca69c7061e07068f82401000000&#x21b5; 03b41daba4c9ace578369740f15e5ec880c28279ee7f51b07dca69c7061e07068f82401000000\
00001600147752c165ea7be772b2c0acb7f4d6047ae6f4768e0141cf5efe2d8ef13ed0af21d4f&#x21b5; 00001600147752c165ea7be772b2c0acb7f4d6047ae6f4768e0141cf5efe2d8ef13ed0af21d4f\
4cb82422d6252d70324f6f4576b727b7d918e521c00b51be739df2f899c49dc267c0ad280aca6&#x21b5; 4cb82422d6252d70324f6f4576b727b7d918e521c00b51be739df2f899c49dc267c0ad280aca6\
dab0d2fa2b42a45182fc83e817130100000000 dab0d2fa2b42a45182fc83e817130100000000
</pre> </pre>
++++ ++++
@ -909,7 +910,7 @@ the parameter:
++++ ++++
<pre data-type="programlisting"> <pre data-type="programlisting">
$ bitcoin-cli getblock 0000000000002917ed80650c6174aac8dfc46f5fe36480aaef682f&#x21b5; $ bitcoin-cli getblock 0000000000002917ed80650c6174aac8dfc46f5fe36480aaef682f\
f6cd83c3ca f6cd83c3ca
</pre> </pre>
++++ ++++
@ -973,10 +974,9 @@ The
and testing functions. But the whole point of an API is to access functions programmatically. In this section we and testing functions. But the whole point of an API is to access functions programmatically. In this section we
will demonstrate accessing Bitcoin Core from another program. will demonstrate accessing Bitcoin Core from another program.
Bitcoin Core's API is a JSON-RPC interface. JSON stands for JavaScript Bitcoin Core's API is a JSON-RPC interface. JSON is a very convenient way to present data that
Object Notation, and it is a very convenient way to present data that both humans and programs can easily read. RPC stands for remote
both humans and programs can easily read. RPC stands for Remote procedure call, which means that we are calling procedures (functions)
Procedure Call, which means that we are calling procedures (functions)
that are remote (on the Bitcoin Core node) via a network protocol. In that are remote (on the Bitcoin Core node) via a network protocol. In
this case, the network protocol is HTTP. this case, the network protocol is HTTP.
@ -1168,7 +1168,7 @@ and more are created all the time.
If you followed the instructions in this chapter, you now have Bitcoin If you followed the instructions in this chapter, you now have Bitcoin
Core running and have begun exploring the network and blockchain using Core running and have begun exploring the network and blockchain using
your own full node. From now on you can independently use software you your own full node. From now on you can independently use software you
control, on a computer you control, to verify any bitcoins you receive control—on a computer you control—to verify that any bitcoins you receive
follow every rule in the Bitcoin system without having to trust any follow every rule in the Bitcoin system without having to trust any
outside authority. In the coming chapters, we'll learn more about the outside authority. In the coming chapters, we'll learn more about the
rules of the system and how your node and your wallet use them to secure rules of the system and how your node and your wallet use them to secure

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@ -384,7 +384,7 @@ geometric operation on the curve.
[TIP] [TIP]
==== ====
Many Bitcoin implementations use Many Bitcoin implementations use
the https://oreil.ly/wD60m[libsecp256k1 crytographic the https://oreil.ly/wD60m[libsecp256k1 cryptographic
library] to do the elliptic curve((("public keys", "generating", startref="public-key-generate")))((("elliptic curve multiplication", startref="elliptic-multiply"))) math. library] to do the elliptic curve((("public keys", "generating", startref="public-key-generate")))((("elliptic curve multiplication", startref="elliptic-multiply"))) math.
==== ====
@ -620,7 +620,7 @@ output, causing them to be lost forever. In the next section, we'll
look at compact encoding and reliable ((("public key cryptography", "hash functions and", startref="pub-key-hash")))((("hash functions", "Bitcoin payments and", startref="hash-payment")))((("payments", "with hash functions", secondary-sortas="hash functions", startref="payment-hash")))((("P2PKH (pay to public key hash)", startref="p2pkh-legacy")))((("addresses", "P2PKH (pay to public key hash)", startref="address-p2pkh-legacy")))((("commitments", startref="commitment")))checksums. look at compact encoding and reliable ((("public key cryptography", "hash functions and", startref="pub-key-hash")))((("hash functions", "Bitcoin payments and", startref="hash-payment")))((("payments", "with hash functions", secondary-sortas="hash functions", startref="payment-hash")))((("P2PKH (pay to public key hash)", startref="p2pkh-legacy")))((("addresses", "P2PKH (pay to public key hash)", startref="address-p2pkh-legacy")))((("commitments", startref="commitment")))checksums.
[[base58]] [[base58]]
=== Base58Check Encoding === Base58check Encoding
In order((("public key cryptography", "base58check encoding", id="pub-key-base58")))((("base58check encoding", id="base58-ch4")))((("encoding", "base58check", id="encode-base58"))) to represent long numbers in a compact way, In order((("public key cryptography", "base58check encoding", id="pub-key-base58")))((("base58check encoding", id="base58-ch4")))((("encoding", "base58check", id="encode-base58"))) to represent long numbers in a compact way,
using fewer symbols, many computer systems use mixed-alphanumeric using fewer symbols, many computer systems use mixed-alphanumeric
@ -690,7 +690,7 @@ encoding process.
[[base58check_encoding]] [[base58check_encoding]]
.Base58check encoding: a base58, versioned, and checksummed format for unambiguously encoding bitcoin data. .Base58check encoding: a base58, versioned, and checksummed format for unambiguously encoding bitcoin data.
image::images/mbc3_0406.png["Base58CheckEncoding"] image::images/mbc3_0406.png["Base58checkEncoding"]
++++ ++++
<p class="fix_tracking2"> <p class="fix_tracking2">
@ -786,7 +786,7 @@ coordinate and reducing the size of the key and the space required to
store it by 256 bits. An almost 50% reduction in size in every store it by 256 bits. An almost 50% reduction in size in every
transaction adds up to a lot of data saved over time! transaction adds up to a lot of data saved over time!
Here's the public key generated by the private key we created in Here is the public key generated by the private key we created in
<<public_key_derivation>>: <<public_key_derivation>>:
---- ----
@ -800,8 +800,8 @@ y+:
++++ ++++
<pre data-type="programlisting"> <pre data-type="programlisting">
K = 04F028892BAD7ED57D2FB57BF33081D5CFCF6F9ED3D3D7F159C2E2FFF579DC341A&#x21b5; K = 04F028892BAD7ED57D2FB57BF33081D5CFCF6F9ED3D3D7F159C2E2FFF579DC341A\
07CF33DA18BD734C600B96A72BBC4749D5141C90EC8AC328AE52DDFE2E505BDB 07CF33DA18BD734C600B96A72BBC4749D5141C90EC8AC328AE52DDFE2E505BDB
</pre> </pre>
++++ ++++
@ -1082,7 +1082,7 @@ The "32" stands for the number of characters in the bech32 alphabet
- Bech32 uses only numbers and a single case of letters (preferably - Bech32 uses only numbers and a single case of letters (preferably
rendered in lowercase). Despite its alphabet being almost half the rendered in lowercase). Despite its alphabet being almost half the
size of the base58check alphabet, a bech32 address for a P2WPKH script size of the base58check alphabet, a bech32 address for a pay to witness public key hash (P2WPKH) script
is only slightly longer than a legacy address for an equivalent P2PKH is only slightly longer than a legacy address for an equivalent P2PKH
script. script.
@ -1331,7 +1331,7 @@ function. The resultant 32-byte digest is then passed into a RIPEMD-160
hash function. The digest of that function (the commitment) is placed hash function. The digest of that function (the commitment) is placed
in the witness program. in the witness program.
For the P2WSH output, we don't use the P2SH algorithm. Instead we take For the pay to witness script hash (P2WSH) output, we don't use the P2SH algorithm. Instead we take
the script, pass it into a SHA256 hash function, and use the 32-byte the script, pass it into a SHA256 hash function, and use the 32-byte
digest of that function in the witness program. For P2SH, the SHA256 digest of that function in the witness program. For P2SH, the SHA256
digest was hashed again with RIPEMD-160, but that may not be secure in digest was hashed again with RIPEMD-160, but that may not be secure in

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@ -508,7 +508,7 @@ and automatically create complete backups of their wallet database
encrypted by one of the keys derived from their seed. Bitcoin keys must encrypted by one of the keys derived from their seed. Bitcoin keys must
be unguessable and modern encryption algorithms are considered very be unguessable and modern encryption algorithms are considered very
secure, so nobody should be able to open the encrypted backup except secure, so nobody should be able to open the encrypted backup except
someone who can generate the seed, making it safe to store the backup on someone who can generate the seed. This makes it safe to store the backup on
untrusted computers such as cloud hosting services or even random untrusted computers such as cloud hosting services or even random
network peers. network peers.
@ -807,7 +807,7 @@ data and the length of recovery code in((("wallets", "recovery codes", "generati
The ((("wallets", "recovery codes", "seed generation", id="wallet-recovery-bip39-seed")))((("recovery codes", "seed generation", id="recovery-code-bip39-seed")))((("BIP39 recovery codes", "seed generation", primary-sortas="BIP039", id="bip39-recovery-seed")))((("entropy", "seed generation", id="entropy-seed-generate")))((("seeds", "generating", id="seed-generate")))((("key-stretching functions", id="key-stretch")))recovery code The ((("wallets", "recovery codes", "seed generation", id="wallet-recovery-bip39-seed")))((("recovery codes", "seed generation", id="recovery-code-bip39-seed")))((("BIP39 recovery codes", "seed generation", primary-sortas="BIP039", id="bip39-recovery-seed")))((("entropy", "seed generation", id="entropy-seed-generate")))((("seeds", "generating", id="seed-generate")))((("key-stretching functions", id="key-stretch")))recovery code
represents entropy with a length of 128 to 256 bits. The entropy is then represents entropy with a length of 128 to 256 bits. The entropy is then
used to derive a longer (512-bit) seed through the use of the used to derive a longer (512-bit) seed through the use of the
key-stretching function PBKDF2. The seed produced is then used to build https://oreil.ly/6lwbd[key-stretching function PBKDF2]. The seed produced is then used to build
a deterministic wallet and derive its keys. a deterministic wallet and derive its keys.
The key-stretching function takes two The key-stretching function takes two
@ -1061,14 +1061,14 @@ wallet is shown in <<HDWalletFromSeed>>.
image::images/mbc3_0506.png["HDWalletFromRootSeed"] image::images/mbc3_0506.png["HDWalletFromRootSeed"]
The root seed is input into the HMAC-SHA512 algorithm and the resulting The root seed is input into the HMAC-SHA512 algorithm and the resulting
hash is used to create a _master private key_ (m) and a _master chain hash is used to create a _master private key_ (_m_) and a _master chain
code_ (c). code_ (_c_).
The master private key (m) then generates a corresponding master public The master private key (_m_) then generates a corresponding master public
key (M) using the normal elliptic curve multiplication process m × _G_ key (_M_) using the normal elliptic curve multiplication process _m_ × _G_
that we saw in <<public_key_derivation>>. that we saw in <<public_key_derivation>>.
The chain code (c) is used to introduce entropy in the function that The master chain code (_c_) is used to introduce entropy in the function that
creates child keys from parent keys, as we will see in the next section. creates child keys from parent keys, as we will see in the next section.
===== Private child key derivation ===== Private child key derivation
@ -1385,8 +1385,8 @@ The index number ((("index numbers for hardened derivation")))used in the deriva
easily distinguish between keys created through the normal derivation easily distinguish between keys created through the normal derivation
function versus keys derived through hardened derivation, this index function versus keys derived through hardened derivation, this index
number is split into two ranges. Index numbers between 0 and number is split into two ranges. Index numbers between 0 and
2^31^&#x2013;1 (0x0 to 0x7FFFFFFF) are used _only_ for normal 2^31^ &#x2013; 1 (0x0 to 0x7FFFFFFF) are used _only_ for normal
derivation. Index numbers between 2^31^ and 2^32^&#x2013;1 (0x80000000 derivation. Index numbers between 2^31^ and 2^32^ &#x2013; 1 (0x80000000
to 0xFFFFFFFF) are used _only_ for hardened derivation. Therefore, if to 0xFFFFFFFF) are used _only_ for hardened derivation. Therefore, if
the index number is less than 2^31^, the child is normal, whereas if the the index number is less than 2^31^, the child is normal, whereas if the
index number is equal or above 2^31^, the child is hardened. index number is equal or above 2^31^, the child is hardened.

View File

@ -193,7 +193,7 @@ The validation software combines the scripts:
2 3 OP_ADD 5 OP_EQUAL 2 3 OP_ADD 5 OP_EQUAL
---- ----
As we saw in <<simplemath_script>>, when As we see in <<simplemath_script>>, when
this script is executed, the result is +OP_TRUE+, making the transaction this script is executed, the result is +OP_TRUE+, making the transaction
valid. Not only have we shown a valid transaction output script, but valid. Not only have we shown a valid transaction output script, but
the resulting UTXO could be spent by anyone with the arithmetic skills the resulting UTXO could be spent by anyone with the arithmetic skills
@ -242,7 +242,7 @@ a vulnerability known as the +1 OP_RETURN+ bug. In the current
implementation, the scripts are executed separately with the stack implementation, the scripts are executed separately with the stack
transferred between the two executions. transferred between the two executions.
First, the input script executed using the stack execution First, the input script is executed using the stack execution
engine. If the input script is executed without errors and has engine. If the input script is executed without errors and has
no operations left over, the stack is copied and the no operations left over, the stack is copied and the
output script is executed. If the result of executing the output script output script is executed. If the result of executing the output script
@ -376,7 +376,7 @@ scripts wrapped in another structure like P2SH, P2WSH, or P2TR.
P2SH multisignature scripts are limited by both policy and consensus to P2SH multisignature scripts are limited by both policy and consensus to
15 keys, allowing for up to a 15-of-15 multisignature. We will learn about 15 keys, allowing for up to a 15-of-15 multisignature. We will learn about
P2SH in <<p2sh>>. All other scripts are consensus limited to 20 keys P2SH in <<p2sh>>. All other scripts are consensus limited to 20 keys
per +OP_CHECKMULTSIG+ or +OP_CHECKMULTISIGVERIFY+ opcode, although one per +OP_CHECKMULTISIG+ or +OP_CHECKMULTISIGVERIFY+ opcode, although one
script may include multiple of those opcodes. script may include multiple of those opcodes.
[role="less_space pagebreak-before"] [role="less_space pagebreak-before"]
@ -417,7 +417,7 @@ replicated forever. Therefore a script should look
like this: like this:
---- ----
OP_0 <Sign B> <Sig C> 2 <Pubkey A> <Pubkey B> <Pubkey C> 3 OP_CHECKMULTISIG OP_0 <Sig B> <Sig C> 2 <Pubkey A> <Pubkey B> <Pubkey C> 3 OP_CHECKMULTISIG
---- ----
Thus the input script actually used in multisig is not: Thus the input script actually used in multisig is not:
@ -780,7 +780,7 @@ It is important to understand the limitations of transaction lock time. The only
In ((("transactions", "timelocks", "verifying", id="transaction-timelock-op-cltv")))((("timelocks", "verifying", id="timelock-op-cltv")))((("lock time", "verifying", id="lock-time-op-cltv")))((("OP_CLTV script operator", id="op-cltv")))((("verifying", "lock time", id="verify-lock-time")))((("scripts", "timelocks", "verifying", id="script-timelock-verify")))December 2015, a new form of In ((("transactions", "timelocks", "verifying", id="transaction-timelock-op-cltv")))((("timelocks", "verifying", id="timelock-op-cltv")))((("lock time", "verifying", id="lock-time-op-cltv")))((("OP_CLTV script operator", id="op-cltv")))((("verifying", "lock time", id="verify-lock-time")))((("scripts", "timelocks", "verifying", id="script-timelock-verify")))December 2015, a new form of
timelock was introduced to Bitcoin as a soft fork upgrade. Based on a timelock was introduced to Bitcoin as a soft fork upgrade. Based on a
specification in BIP65, a new script operator called specification in BIP65, a new script operator called
_OP_CHECKLOCKTIMEVERIFY_ (_CLTV_) was added to the scripting language. +OP_CHECKLOCKTIMEVERIFY+ (+OP_CLTV+) was added to the scripting language.
+OP_CLTV+ is a per-output timelock rather than a per-transaction timelock, +OP_CLTV+ is a per-output timelock rather than a per-transaction timelock,
as is the case with lock time. This allows for additional as is the case with lock time. This allows for additional
flexibility in the way timelocks are applied. flexibility in the way timelocks are applied.
@ -1184,7 +1184,7 @@ account directly after he gains access to the capital account's
transaction records. transaction records.
<<variable_timelock_multisig>> is the redeem script that Mohammed designs to achieve this (line <<variable_timelock_multisig>> is the redeem script that Mohammed designs to achieve this (line
number prefixed as XX). number have been prefixed).
[[variable_timelock_multisig]] [[variable_timelock_multisig]]
.Variable multi-signature with timelock .Variable multi-signature with timelock
@ -1467,7 +1467,7 @@ backward-compatible upgrade, where _old and new clients can coexist_.
Wallet developers independently upgraded wallet software to add Wallet developers independently upgraded wallet software to add
segwit capabilities. segwit capabilities.
Legacy P2PKH and Legacy P2PKH and
P2SH continue to work for nonupgraded wallets. That leaves two P2SH continue to work for [.keep-together]#nonupgraded# wallets. That leaves two
important scenarios, which are addressed in the next section: important scenarios, which are addressed in the next section:
- Ability of a spender's wallet that is not segwit-aware to make a - Ability of a spender's wallet that is not segwit-aware to make a
@ -1962,7 +1962,7 @@ called _tapscript_. The major differences include:
[role="less_space pagebreak-before"] [role="less_space pagebreak-before"]
Scripted multisignature changes:: Scripted multisignature changes::
The old +OP_CHECKMULTSIG+ and +OP_CHECKMULTISIGVERIFY+ opcodes are The old +OP_CHECKMULTISIG+ and +OP_CHECKMULTISIGVERIFY+ opcodes are
removed. Those opcodes don't combine well with one of the other removed. Those opcodes don't combine well with one of the other
changes in the taproot soft fork, the ability to use schnorr signatures changes in the taproot soft fork, the ability to use schnorr signatures
with batch validation (see <<schnorr_signatures>>). A new +OP_CHECKSIGADD+ opcode is provided with batch validation (see <<schnorr_signatures>>). A new +OP_CHECKSIGADD+ opcode is provided

View File

@ -416,7 +416,7 @@ The nonce (k)::
In step 1, ((("digital signatures", "schnorr signature algorithm", "security features")))((("schnorr signature algorithm", "security features")))Alice chooses a number that Bob doesn't In step 1, ((("digital signatures", "schnorr signature algorithm", "security features")))((("schnorr signature algorithm", "security features")))Alice chooses a number that Bob doesn't
know and can't guess and gives him the scaled form of that number, know and can't guess and gives him the scaled form of that number,
_kG_. At that point, Bob also already has her public key (_xG_), _kG_. At that point, Bob also already has her public key (_xG_),
which is the scaled form of _x_), her private key. That means when Bob is working on which is the scaled form of _x_, her private key. That means when Bob is working on
the final equation (_sG_ = _kG_ + _exG_), there are two independent the final equation (_sG_ = _kG_ + _exG_), there are two independent
variables that Bob doesn't know (_x_ and _k_). It's possible to use variables that Bob doesn't know (_x_ and _k_). It's possible to use
simple algebra to solve an equation with one unknown variable but not simple algebra to solve an equation with one unknown variable but not
@ -520,10 +520,10 @@ full commitment _hash_(_kG_ || _xG_ || _m_).
Now that we've described each part of the BIP340 schnorr signature Now that we've described each part of the BIP340 schnorr signature
algorithm and explained what it does for us, we can define the protocol. algorithm and explained what it does for us, we can define the protocol.
Multiplication of integers are performed _modulus p_, indicating that the Multiplication of integers are performed _modulus p_, indicating that the
result of the operation divided by the number _p_ (as defined in the result of the operation is divided by the number _p_ (as defined in the
secp256k1 standard) and the remainder is used. The number _p_ is very secp256k1 standard) and the remainder is used. The number _p_ is very
large, but if it was 3 and the result of an operation was 5, the actual large, but if it was 3 and the result of an operation was 5, the actual
number we would use is 2 (i.e., 5 divided by 3 is 2). number we would use is 2 (i.e., 5 divided by 3 has a remainder of 2).
Setup: Alice chooses a large random number (_x_) as her private key Setup: Alice chooses a large random number (_x_) as her private key
(either directly or by using a protocol like BIP32 to deterministically (either directly or by using a protocol like BIP32 to deterministically
@ -620,10 +620,10 @@ simple multisignature protocol:
3. Alice produces the scalar _q_ = _a_ + _ey_. Bob produces the scalar 3. Alice produces the scalar _q_ = _a_ + _ey_. Bob produces the scalar
_r_ = _b_ + _ez_. They add the scalars together to produce _r_ = _b_ + _ez_. They add the scalars together to produce
_s_ = _q_ + _r_. Their signature is the two values _kG_ and _s_. _s_ = _q_ + _r_. Their signature is the two values _kG_ [.keep-together]#and _s_.#
4. The verifiers check their public key and signature using the normal 4. The verifiers check their public key and signature using the normal
equation: _sG_ == _kG_ + _hash_(_kG_ || _xG_ || _m_) × _xG_. equation: [.keep-together]#_sG_ ==# _kG_ + _hash_(_kG_ || _xG_ || _m_) × _xG_.
Alice and Bob have proven that they know the sum of their private keys without Alice and Bob have proven that they know the sum of their private keys without
either one of them revealing their private key to the other or anyone either one of them revealing their private key to the other or anyone

View File

@ -6,11 +6,11 @@
The digital signature we saw Alice create in <a data-type="xref" href="#c_signatures">#c_signatures</a> only The digital signature we saw Alice create in <a data-type="xref" href="#c_signatures">#c_signatures</a> only
proves that she knows her private key and that she committed to a proves that she knows her private key and that she committed to a
transaction that pays Bob. She can create another signature that transaction that pays Bob. She can create another signature that
instead commits to a transaction paying Carol--a transaction that spends instead commits to a transaction paying Carola transaction that spends
the same output (bitcoins) that she used to pay Bob. Those two the same output (bitcoins) that she used to pay Bob. Those two
transactions are now <em>conflicting transactions</em> because only one transactions are now <em>conflicting transactions</em> because only one
transaction spending a particular output can be included in the valid transaction spending a particular output can be included in the valid
blockchain with the most proof of work--the blockchain that full nodes blockchain with the most proof of workthe blockchain that full nodes
use to determine which keys control which bitcoins. use to determine which keys control which bitcoins.
</p> </p>
++++ ++++
@ -39,7 +39,7 @@ previous transaction and is also an exception to several other rules
that apply to other transactions. Coinbase transactions don't pay that apply to other transactions. Coinbase transactions don't pay
transaction fees, don't need to be fee bumped, aren't subject to transaction fees, don't need to be fee bumped, aren't subject to
transaction pinning, and are largely uninteresting to the following transaction pinning, and are largely uninteresting to the following
discussion about fees--so we're going to ignore them in this chapter. discussion about feesso we're going to ignore them in this chapter.
</p> </p>
</div> </div>
++++ ++++
@ -133,7 +133,7 @@ fee rates.
Be careful ((("absurd fees")))((("excessive fees")))((("transaction fees", "overpaying")))((("overpaying transaction fees")))accepting input for fee rates. If a user copies and pastes a Be careful ((("absurd fees")))((("excessive fees")))((("transaction fees", "overpaying")))((("overpaying transaction fees")))accepting input for fee rates. If a user copies and pastes a
fee rate printed in one denominator into a field using a different fee rate printed in one denominator into a field using a different
denominator, they could overpay fees by 1,000 times. If they instead denominator, they could overpay fees by 1,000 times. If they instead
switch the denominator, they could theoretically overpay by 100,000,000 switch the numerator, they could theoretically overpay by 100,000,000
times. Wallets should make it hard for the user to pay an excessive times. Wallets should make it hard for the user to pay an excessive
fee rate and may want to prompt the user to confirm any fee rate that was fee rate and may want to prompt the user to confirm any fee rate that was
not generated by the wallet itself using a trusted data source. not generated by the wallet itself using a trusted data source.
@ -639,7 +639,7 @@ you intended.
Fee sniping ((("transaction fees", "fee sniping", id="transaction-fee-sniping")))((("fee sniping", id="fee-snipe")))((("timelocks", "fee sniping and", id="timelock-fee-snipe")))((("lock time", "fee sniping and", id="lock-time-fee-snipe")))is a theoretical Fee sniping ((("transaction fees", "fee sniping", id="transaction-fee-sniping")))((("fee sniping", id="fee-snipe")))((("timelocks", "fee sniping and", id="timelock-fee-snipe")))((("lock time", "fee sniping and", id="lock-time-fee-snipe")))is a theoretical
attack scenario where miners attempting to rewrite past blocks "snipe" attack scenario where miners attempting to rewrite past blocks "snipe"
higher-fee transactions from future blocks to maximize their higher-fee transactions from future blocks to maximize their
profitability. [.keep-together]#profitability.#
For example, let's say the highest block in existence is block For example, let's say the highest block in existence is block
#100,000. If instead of attempting to mine block #100,001 to extend the #100,000. If instead of attempting to mine block #100,001 to extend the

View File

@ -523,7 +523,7 @@ both tourists can verify the existence of a street by visiting it, the
tourist without a map doesn't know what lies down any of the side tourist without a map doesn't know what lies down any of the side
streets and doesn't know what other streets exist. Positioned in front streets and doesn't know what other streets exist. Positioned in front
of 23 Church Street, the tourist without a map cannot know if there are of 23 Church Street, the tourist without a map cannot know if there are
a dozen other "23 Church Street" addresses in the city and whether this a dozen other [.keep-together]#"23 Church# Street" addresses in the city and whether this
is the right one. The mapless tourist's best chance is to ask enough is the right one. The mapless tourist's best chance is to ask enough
people and hope some of them are not trying to mug him. people and hope some of them are not trying to mug him.
@ -720,7 +720,7 @@ pattern is definitely((("Bitcoin network", "bloom filters", "operational overvie
.Testing the existence of pattern "Y" in the bloom filter. The result is a definitive negative match, meaning "Definitely Not!" .Testing the existence of pattern "Y" in the bloom filter. The result is a definitive negative match, meaning "Definitely Not!"
image::images/mbc3_1010.png[] image::images/mbc3_1010.png[]
=== How Lightweight Clients Use Bloom Filters ==== How Lightweight Clients Use Bloom Filters
Bloom filters ((("Bitcoin network", "bloom filters", "lightweight clients and", id="bitcoin-network-bloom-lightweight")))((("bloom filters", "lightweight clients and", id="bloom-lightweight")))((("lightweight clients", "bloom filters and", id="lightweight-bloom")))are used to filter the transactions (and blocks containing Bloom filters ((("Bitcoin network", "bloom filters", "lightweight clients and", id="bitcoin-network-bloom-lightweight")))((("bloom filters", "lightweight clients and", id="bloom-lightweight")))((("lightweight clients", "bloom filters and", id="lightweight-bloom")))are used to filter the transactions (and blocks containing
them) that a lightweight client receives from its peers, selecting only them) that a lightweight client receives from its peers, selecting only
@ -1170,8 +1170,6 @@ As a way to increase the privacy and security of the Bitcoin P2P
network, there is a solution that provides encryption of the network, there is a solution that provides encryption of the
communications: _Tor transport_. communications: _Tor transport_.
==== Tor Transport
Tor, which Tor, which
stands for _The Onion Routing network_, is a software project and stands for _The Onion Routing network_, is a software project and
network that offers encryption and encapsulation of data through network that offers encryption and encapsulation of data through

View File

@ -6,7 +6,7 @@ It's what allows every full node to independently determine what keys and
scripts control which bitcoins. In this chapter, we'll look at the scripts control which bitcoins. In this chapter, we'll look at the
structure of the blockchain and see how it uses cryptographic structure of the blockchain and see how it uses cryptographic
commitments and other clever tricks to make every part of it easy for commitments and other clever tricks to make every part of it easy for
full nodes (and sometimes light clients) to validate. full nodes (and sometimes lightweight clients) to validate.
The blockchain data structure is The blockchain data structure is
an ordered, back-linked list of blocks of transactions. The blockchain an ordered, back-linked list of blocks of transactions. The blockchain
@ -382,7 +382,7 @@ Bitcoin's merkle trees is SHA256 applied twice, also known as
double-SHA256. double-SHA256.
When N data elements are hashed and summarized in a merkle tree, you can When N data elements are hashed and summarized in a merkle tree, you can
check to see if any one data element is included in the tree with at check to see if any one data element is included in the tree with
about +log~2~(N)+ calculations, making this a very efficient data about +log~2~(N)+ calculations, making this a very efficient data
structure. structure.
@ -812,7 +812,7 @@ $ bitcoin-cli -regtest generatetoaddress 500 \
It will only take a few seconds to mine all these blocks, which It will only take a few seconds to mine all these blocks, which
certainly makes it easy for testing. If you check your wallet balance, certainly makes it easy for testing. If you check your wallet balance,
you will see that you earned a reward for the first 400 blocks (coinbase you will see that you earned the rewards for the first 400 blocks (coinbase
rewards must be 100 blocks deep before you can ((("blockchain", "test blockchains", "regtest", startref="blockchain-test-regtest")))((("test blockchains", "regtest", startref="test-block-regtest")))((("regtest", startref="regtest")))spend them): rewards must be 100 blocks deep before you can ((("blockchain", "test blockchains", "regtest", startref="blockchain-test-regtest")))((("test blockchains", "regtest", startref="test-block-regtest")))((("regtest", startref="regtest")))spend them):
---- ----
@ -826,7 +826,7 @@ Bitcoin's ((("blockchain", "test blockchains", "development usage")))((("test bl
blockchains (regtest, signet, testnet3, mainnet) offer a range blockchains (regtest, signet, testnet3, mainnet) offer a range
of testing environments for bitcoin development. Use the test of testing environments for bitcoin development. Use the test
blockchains whether you are developing for Bitcoin Core or another blockchains whether you are developing for Bitcoin Core or another
full-node consensus client (an application such as a wallet, exchange, full-node consensus client; an application such as a wallet, exchange,
ecommerce site; or even developing novel smart contracts and complex ecommerce site; or even developing novel smart contracts and complex
scripts). scripts).

View File

@ -167,8 +167,7 @@ The most ((("deflation", id="deflation")))((("inflation", id="inflation")))impor
fixed and diminishing monetary issuance is that the currency tends to be fixed and diminishing monetary issuance is that the currency tends to be
inherently _deflationary_. Deflation is the phenomenon of appreciation inherently _deflationary_. Deflation is the phenomenon of appreciation
of value due to a mismatch in supply and demand that drives up the value of value due to a mismatch in supply and demand that drives up the value
(and exchange rate) of a currency. The opposite of inflation, price (and exchange rate) of a currency. Price deflation is the opposite of inflation; it means that the money has more purchasing power over time.
deflation, means that the money has more purchasing power over time.
Many economists argue that a deflationary economy is a disaster that Many economists argue that a deflationary economy is a disaster that
should be avoided at all costs. That is because in a period of rapid should be avoided at all costs. That is because in a period of rapid
@ -947,7 +946,7 @@ New Target = Old Target * (20,160 minutes / Actual Time of Last 2015 Blocks)
[NOTE] [NOTE]
==== ====
While the target calibration happens every 2,016 blocks, because of an While the target calibration happens every 2,016 blocks, because of an
off-by-one error in the original Bitcoin software it is based on the off-by-one error in the original Bitcoin software, it is based on the
total time of the previous 2,015 blocks (not 2,016 as it should be), total time of the previous 2,015 blocks (not 2,016 as it should be),
resulting in a retargeting bias toward higher difficulty by 0.05%. resulting in a retargeting bias toward higher difficulty by 0.05%.
==== ====
@ -1397,8 +1396,7 @@ eight-or-less wasn't winning, it was a fair way to measure dice throws
for the players, and it occasionally produces a less-than-four throw. for the players, and it occasionally produces a less-than-four throw.
Similarly, a mining pool will set a (higher and easier) pool target that Similarly, a mining pool will set a (higher and easier) pool target that
will ensure that an individual pool miner can find block header hashes will ensure that an individual pool miner frequently earns shares by finding block header hashes that are less than the pool target. Every now and
that are less than the pool target often, earning shares. Every now and
then, one of these attempts will produce a block header hash that is then, one of these attempts will produce a block header hash that is
less than the Bitcoin network target, making it a valid block and the less than the Bitcoin network target, making it a valid block and the
whole pool wins. whole pool wins.
@ -2015,7 +2013,7 @@ a different bit, renewing the activation period.
Furthermore, after the +TIMEOUT+ has passed and a feature has been Furthermore, after the +TIMEOUT+ has passed and a feature has been
activated or rejected, the signaling bit can be reused for another activated or rejected, the signaling bit can be reused for another
feature without confusion. Therefore, up to 29 changes can be signaled feature without confusion. Therefore, up to 29 changes can be signaled
in parallel and after +TIMEOUT+, the bits can be "recycled" to propose in parallel. After +TIMEOUT+, the bits can be "recycled" to propose
new changes. new changes.
[NOTE] [NOTE]

View File

@ -145,7 +145,7 @@ intrinsic to the blockchain.
Colored coins are used to track digital Colored coins are used to track digital
assets as well as physical assets held by third parties and traded assets as well as physical assets held by third parties and traded
through colored coins certificates of ownership. Digital asset colored through certificates of ownership associated with colored coins. Digital asset colored
coins can represent intangible assets such as a stock certificate, coins can represent intangible assets such as a stock certificate,
license, virtual property (game items), or most any form of licensed license, virtual property (game items), or most any form of licensed
intellectual property (trademarks, copyrights, etc.). Tangible asset intellectual property (trademarks, copyrights, etc.). Tangible asset
@ -340,7 +340,7 @@ Translated forwarding::
support forwarding bitcoin [.keep-together]#payments.# support forwarding bitcoin [.keep-together]#payments.#
Native forwarding is conceptually simpler but essentially requires a Native forwarding is conceptually simpler but essentially requires a
separate LN for every asset. Translated forwarding separate Lightning-type network for every asset. Translated forwarding
allows building on the economies of scale of the Bitcoin LN, but it may be vulnerable to a problem called((("free American call option"))) the _free American allows building on the economies of scale of the Bitcoin LN, but it may be vulnerable to a problem called((("free American call option"))) the _free American
call option_, where a receiver may selectively accept or reject certain call option_, where a receiver may selectively accept or reject certain
payments depending on recent changes to the exchange rate in order to payments depending on recent changes to the exchange rate in order to
@ -1038,7 +1038,7 @@ efficient route.
Alice's node then constructs an HTLC, payable to the hash +H+, with a Alice's node then constructs an HTLC, payable to the hash +H+, with a
10-block refund timeout (current block + 10), for an amount of 1.003 10-block refund timeout (current block + 10), for an amount of 1.003
bitcoins (see <<ln_payment_process>> step 2). The extra 0.003 will be bitcoins (see <<ln_payment_process>>, step 2). The extra 0.003 will be
used to compensate the intermediate nodes for their participation in used to compensate the intermediate nodes for their participation in
this payment route. Alice offers this HTLC to Bob, deducting 1.003 this payment route. Alice offers this HTLC to Bob, deducting 1.003
bitcoins from her channel balance with Bob and committing it to the HTLC. bitcoins from her channel balance with Bob and committing it to the HTLC.
@ -1068,7 +1068,7 @@ Carol now has a commitment that if she gets +R+ within the next nine
blocks, she can claim 1.002 bitcoins locked by Bob. Now she can make an blocks, she can claim 1.002 bitcoins locked by Bob. Now she can make an
HTLC commitment on her channel with Diana. She commits an HTLC of 1.001 HTLC commitment on her channel with Diana. She commits an HTLC of 1.001
bitcoins to hash +H+, for eight blocks, which Diana can redeem if she has bitcoins to hash +H+, for eight blocks, which Diana can redeem if she has
secret +R+ (see <<ln_payment_process>> step 4). From Carol's secret +R+ (see <<ln_payment_process>>, step 4). From Carol's
perspective, if this works she is 0.001 bitcoins better off and if it perspective, if this works she is 0.001 bitcoins better off and if it
doesn't she loses nothing. Her HTLC to Diana is only viable if +R+ is doesn't she loses nothing. Her HTLC to Diana is only viable if +R+ is
revealed, at which point she can claim the HTLC from Bob. The channel revealed, at which point she can claim the HTLC from Bob. The channel
@ -1076,27 +1076,27 @@ balance between Carol and Diana is now: 2 to Diana, 0.999 to Carol,
1.001 committed by Carol to the HTLC. 1.001 committed by Carol to the HTLC.
Finally, Diana can offer an HTLC to Eric, committing 1 bitcoin for seven Finally, Diana can offer an HTLC to Eric, committing 1 bitcoin for seven
blocks to hash +H+ (see <<ln_payment_process>> step 5). The channel blocks to hash +H+ (see <<ln_payment_process>>, step 5). The channel
balance between Diana and Eric is now: 2 to Eric, 1 to Diana, 1 balance between Diana and Eric is now: 2 to Eric, 1 to Diana, 1
committed by Diana to the HTLC. committed by Diana to the HTLC.
However, at this hop in the route, Eric _has_ secret +R+. He can However, at this hop in the route, Eric _has_ secret +R+. He can
therefore claim the HTLC offered by Diana. He sends +R+ to Diana and therefore claim the HTLC offered by Diana. He sends +R+ to Diana and
claims the 1 bitcoin, adding it to his channel balance (see claims the 1 bitcoin, adding it to his channel balance (see
<<ln_payment_process>> step 6). The channel balance is now: 1 to Diana, <<ln_payment_process>>, step 6). The channel balance is now: 1 to Diana,
3 to Eric. 3 to Eric.
Now, Diana has secret +R+. Therefore, she can now claim the HTLC from Now, Diana has secret +R+. Therefore, she can now claim the HTLC from
Carol. Diana transmits +R+ to Carol and adds the 1.001 bitcoins to her Carol. Diana transmits +R+ to Carol and adds the 1.001 bitcoins to her
channel balance (see <<ln_payment_process>> step 7). Now the channel channel balance (see <<ln_payment_process>>, step 7). Now the channel
balance between Carol and Diana is: 0.999 to Carol, 3.001 to Diana. balance between Carol and Diana is: 0.999 to Carol, 3.001 to Diana.
Diana has "earned" 0.001 for participating in this payment route. Diana has "earned" 0.001 for participating in this payment route.
Flowing back through the route, the secret +R+ allows each participant Flowing back through the route, the secret +R+ allows each participant
to claim the outstanding HTLCs. Carol claims 1.002 from Bob, setting the to claim the outstanding HTLCs. Carol claims 1.002 from Bob, setting the
balance on their channel to: 0.998 to Bob, 3.002 to Carol (see balance on their channel to: 0.998 to Bob, 3.002 to Carol (see
<<ln_payment_process>> step 8). Finally, Bob claims the HTLC from Alice <<ln_payment_process>>, step 8). Finally, Bob claims the HTLC from Alice
(see <<ln_payment_process>> step 9). Their channel balance is updated (see <<ln_payment_process>>, step 9). Their channel balance is updated
as: 0.997 to Alice, 3.003 to Bob. as: 0.997 to Alice, 3.003 to Bob.
Alice has paid Eric 1 bitcoin without opening a channel to Eric. None of Alice has paid Eric 1 bitcoin without opening a channel to Eric. None of

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@ -10,5 +10,5 @@
<p>Many of the animals on O'Reilly covers are endangered; all of them are important to the world. To learn more about how you can help, go to <a class="orm:hideurl" href="https://animals.oreilly.com"><em>animals.oreilly.com</em></a>.</p> <p>Many of the animals on O'Reilly covers are endangered; all of them are important to the world. To learn more about how you can help, go to <a class="orm:hideurl" href="https://animals.oreilly.com"><em>animals.oreilly.com</em></a>.</p>
<p>The cover image is from <em>Insects Abroad</em>. The cover fonts are URW Typewriter and Guardian Sans. The text font is Adobe Minion Pro; the heading font is Adobe Myriad Condensed; and the code font is Dalton Maag's Ubuntu Mono.</p> <p>The cover illustration is by Karen Montgomery, based on an image from <em>Insects Abroad</em>. The cover fonts are Gilroy Semibold and Guardian Sans. The text font is Adobe Minion Pro; the heading font is Adobe Myriad Condensed; and the code font is Dalton Maag's Ubuntu Mono.</p>
</section> </section>

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@ -12,7 +12,7 @@ development in 2023 have been added.
Old Chapters 6 and 7:: Old Chapters 6 and 7::
Text from previous versions of Chapter 6, "Transactions," and Chapter 7, Text from previous versions of Chapter 6, "Transactions," and Chapter 7,
"Advanced Transactions," has been rearranged and expanded across four "Advanced Transactions," has been rearranged and expanded across four
new chapters: pass:[<a data-type="xref" data-xrefstyle="chap-num-title" href="#c_transactions">#c_transactions</a>] (the structure of txes), pass:[<a data-type="xref" data-xrefstyle="chap-num-title" href="#c_authorization_authentication">#c_authorization_authentication</a>], pass:[<a data-type="xref" data-xrefstyle="chap-num-title" href="#c_signatures">#c_signatures</a>], and new chapters: pass:[<a data-type="xref" data-xrefstyle="chap-num-title" href="#c_transactions">#c_transactions</a>] (the structure of transactions), pass:[<a data-type="xref" data-xrefstyle="chap-num-title" href="#c_authorization_authentication">#c_authorization_authentication</a>], pass:[<a data-type="xref" data-xrefstyle="chap-num-title" href="#c_signatures">#c_signatures</a>], and
pass:[<a data-type="xref" data-xrefstyle="chap-num-title" href="#tx_fees">#tx_fees</a>]. pass:[<a data-type="xref" data-xrefstyle="chap-num-title" href="#tx_fees">#tx_fees</a>].
<<c_transactions>>:: <<c_transactions>>::

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@ -169,7 +169,7 @@ During the development of the book, I made early drafts available on GitHub and
Once the book was drafted, it went through several rounds of technical review. Thanks to Cricket Liu and Lorne Lantz for their thorough review, comments, and support. Once the book was drafted, it went through several rounds of technical review. Thanks to Cricket Liu and Lorne Lantz for their thorough review, comments, and support.
Several Bitcoin developers contributed code samples, reviews, comments, and encouragement. Thanks to Amir Taaki and Eric Voskuil for example code snippets and many great comments; Chris Kleeschulte for contributing the Bitcore appendix; Vitalik Buterin and Richard Kiss for help with elliptic curve math and code contributions; Gavin Andresen for corrections, comments, and encouragement; Michalis Kargakis for comments, contributions, and btcd writeup; and Robin Inge for errata submissions improving the second print. In the second edition, I again received a lot of help from many Bitcoin Core developers, including Eric Lombrozo who demystified segregated witness, Luke Dashjr who helped improve the chapter on transactions, Johnson Lau who reviewed segregated witness and other chapters, and many others. I owe thanks to Joseph Poon, Tadge Dryja, and Olaoluwa Osuntokun who explained Lightning Network, reviewed my writing, and answered questions when I got stuck. Several Bitcoin developers contributed code samples, reviews, comments, and encouragement. Thanks to Amir Taaki and Eric Voskuil for example code snippets and many great comments; Chris Kleeschulte for contributing information about Bitcore; Vitalik Buterin and Richard Kiss for help with elliptic curve math and code contributions; Gavin Andresen for corrections, comments, and encouragement; Michalis Kargakis for comments, contributions, and btcd writeup; and Robin Inge for errata submissions improving the second print. In the second edition, I again received a lot of help from many Bitcoin Core developers, including Eric Lombrozo who demystified segregated witness, Luke Dashjr who helped improve the chapter on transactions, Johnson Lau who reviewed segregated witness and other chapters, and many others. I owe thanks to Joseph Poon, Tadge Dryja, and Olaoluwa Osuntokun who explained Lightning Network, reviewed my writing, and answered questions when I got stuck.
I owe my love of words and books to my mother, Theresa, who raised me in a house with books lining every wall. My mother also bought me my first computer in 1982, despite being a self-described technophobe. My father, Menelaos, a civil engineer who just published his first book at 80 years old, was the one who taught me logical and analytical thinking and a love of science and engineering. I owe my love of words and books to my mother, Theresa, who raised me in a house with books lining every wall. My mother also bought me my first computer in 1982, despite being a self-described technophobe. My father, Menelaos, a civil engineer who just published his first book at 80 years old, was the one who taught me logical and analytical thinking and a love of science and engineering.