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CH04: edits suggested by arufino (thanks!)

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David A. Harding 2023-02-20 08:46:26 -10:00
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@ -23,7 +23,7 @@ that itself commits to Bob's public key and other transaction details.
image::images/mbc2_abin01.png["Transaction chain from original Bitcoin paper"] image::images/mbc2_abin01.png["Transaction chain from original Bitcoin paper"]
We'll examine public keys, private keys, signatures, and hash functions We'll examine public keys, private keys, signatures, and hash functions
in the following sections, and then use all of them together to describe in this chapter, and then use all of them together to describe
the addresses used by modern Bitcoin software. the addresses used by modern Bitcoin software.
=== Public Key Cryptography === Public Key Cryptography
@ -1087,7 +1087,7 @@ The "32" stands for the number of characters in the bech32 alphabet
base58check. For longer errors, it will fail to detect them less than base58check. For longer errors, it will fail to detect them less than
one time in a billion, which is roughly the same reliability as one time in a billion, which is roughly the same reliability as
base58check. Even better, for an address typed with just a few base58check. Even better, for an address typed with just a few
errors, it can tell the user where those errors occurred, allowing them errors, it can tell the user where those errors occurred, allowing them to
quickly correct minor transcription mistakes. See <<bech32_typo_detection>> quickly correct minor transcription mistakes. See <<bech32_typo_detection>>
for an example of an address entered with errors. for an example of an address entered with errors.
@ -1139,8 +1139,9 @@ algorithm just happened to make it very easy to add or remove the letter
"p". In those cases, you can also add or remove the letter "q" multiple "p". In those cases, you can also add or remove the letter "q" multiple
times. This will be caught by the checksum some of the time, but it times. This will be caught by the checksum some of the time, but it
will be missed far more often than the one-in-a-billion expectations for will be missed far more often than the one-in-a-billion expectations for
bech32's substitution errors. bech32's substitution errors. For an example, see <<bech32_length_extension_example>>.
[[bech32_length_extension_example]]
.Extending the length of bech32 address without invalidating its checksum .Extending the length of bech32 address without invalidating its checksum
==== ====
---- ----
@ -1203,8 +1204,10 @@ Bitcoin wallets.
Bech32m addresses start with a Human Readable Part (HRP). There are Bech32m addresses start with a Human Readable Part (HRP). There are
rules in BIP173 for creating your own HRPs, but for Bitcoin you only rules in BIP173 for creating your own HRPs, but for Bitcoin you only
need to know about the HRPs already chosen: need to know about the HRPs already chosen, shown in
<<bech32_hrps_for_bitcoin>>.
[[bech32_hrps_for_bitcoin]]
.Bech32 HRPs for Bitcoin .Bech32 HRPs for Bitcoin
[cols="1,1"] [cols="1,1"]
|=== |===
@ -1259,7 +1262,8 @@ for Python].
Let's start by generating four output scripts, one for each of the Let's start by generating four output scripts, one for each of the
different segwit outputs in use at the time of publication, plus one for different segwit outputs in use at the time of publication, plus one for
a future segwit version that doesn't yet have a defined meaning. a future segwit version that doesn't yet have a defined meaning. The
scripts are listed in <<scripts_for_diff_segwit_outputs>>.
// bc1q9d3xa5gg45q2j39m9y32xzvygcgay4rgc6aaee // bc1q9d3xa5gg45q2j39m9y32xzvygcgay4rgc6aaee
// 2b626ed108ad00a944bb2922a309844611d25468 // 2b626ed108ad00a944bb2922a309844611d25468
@ -1273,6 +1277,7 @@ a future segwit version that doesn't yet have a defined meaning.
// bc1sqqqqkfw08p // bc1sqqqqkfw08p
// O_16 OP_PUSH2 0000 // O_16 OP_PUSH2 0000
[[scripts_for_diff_segwit_outputs]]
.Scripts for different types of segwit outputs .Scripts for different types of segwit outputs
[cols="1,1"] [cols="1,1"]
|=== |===
@ -1399,7 +1404,7 @@ When implementing bech32m encoding or decoding, we very strongly
recommend that you use the test vectors provided in BIP350. We also ask recommend that you use the test vectors provided in BIP350. We also ask
that you ensure your code passes the test vectors related to paying future segwit that you ensure your code passes the test vectors related to paying future segwit
versions that haven't been defined yet. This will help make your versions that haven't been defined yet. This will help make your
software usable for many years to come even if you aren't able to add software is usable for many years to come even if you aren't able to add
support for new Bitcoin features as soon as they become available. support for new Bitcoin features as soon as they become available.
[[priv_formats]] [[priv_formats]]
@ -1739,3 +1744,13 @@ startref="Wpaper04")))((("", startref="paperw04")))
[[paper_wallet_spw]] [[paper_wallet_spw]]
.An example of a paper wallet with additional copies of the keys on a backup "stub" .An example of a paper wallet with additional copies of the keys on a backup "stub"
image::images/mbc2_0412.png[] image::images/mbc2_0412.png[]
From the original public-key focused design of Bitcoin to modern addresses
and scripts like bech32m and pay-to-taproot--and even addresses for
future Bitcoin upgrades--you've learned how the Bitcoin protocol allows
spenders to identify the wallets which should receive their payments.
But when it's actually your wallet receiving the payments, you're going
to want the assurance that you'll still have access to that money even
if something happens to your wallet data. In the next chapter, we'll
look at how Bitcoin wallets are designed to protect their funds from a
variety of threats.