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[[appdxbitcoinimpproposals]]
[appendix]
== Bitcoin Improvement Proposals
((("bitcoin improvement proposals", "types of")))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.
As per BIP-01 _BIP Purpose and Guidelines_, there are three kinds of BIPs:
_Standard_ BIP:: Describes any change that affects most or all bitcoin implementations, such as a change to the network protocol, a change in block or transaction validity rules, or any change or addition that affects the interoperability of applications using bitcoin.
_Informational_ BIP:: Describes a bitcoin design issue, or provides general guidelines or information to the bitcoin community, but does not propose a new feature. Informational BIPs do not necessarily represent a bitcoin community consensus or recommendation, so users and implementors may ignore informational BIPs or follow their advice.
_Process_ BIP:: Describes a bitcoin process, or proposes a change to (or an event in) a process. Process BIPs are like standard BIPs but apply to areas other than the Bitcoin protocol itself. They might propose an implementation, but not to bitcoin's codebase; they often require community consensus; and unlike informational BIPs, they are more than recommendations, and users are typically not free to ignore them. Examples include procedures, guidelines, changes to the decision-making process, and changes to the tools or environment used in bitcoin development. Any meta-BIP is also considered a process BIP.
((("bitcoin improvement proposals", "repository of")))BIPs are recorded in a versioned repository on GitHub: https://github.com/bitcoin/bips[https://github.com/bitcoin/bips]. <<table_d-1>> shows a snapshot of the BIPs in April 2017. Consult the authoritative repository for up-to-date information on existing BIPs and their contents.((("bitcoin improvement proposals", "snapshot of", id="BIPsnap15")))
[[table_d-1]]
.Snapshot of BIPs
[options="header"]
|=======================================================================
|BIP# | Title |Owner |Type |Status
|[[bip-1]]https://github.com/bitcoin/bips/blob/master/bip-0001.mediawiki[BIP-1] |BIP Purpose and Guidelines |Amir Taaki |Process |Replaced
|[[bip-2]]https://github.com/bitcoin/bips/blob/master/bip-0002.mediawiki[BIP-2] |BIP process, revised |Luke Dashjr |Process |Active
|[[bip-8]]https://github.com/bitcoin/bips/blob/master/bip-0008.mediawiki[BIP-8] |Version bits with guaranteed lock-in |Shaolin Fry |Informational |Draft
|[[bip-9]]https://github.com/bitcoin/bips/blob/master/bip-0009.mediawiki[BIP-9] |Version bits with timeout and delay |Pieter Wuille, Peter Todd, Greg Maxwell, Rusty Russell |Informational |Final
|[[bip-10]]https://github.com/bitcoin/bips/blob/master/bip-0010.mediawiki[BIP-10] |Multi-Sig Transaction Distribution |Alan Reiner |Informational |Withdrawn
|[[bip-11]]https://github.com/bitcoin/bips/blob/master/bip-0011.mediawiki[BIP-11] |M-of-N Standard Transactions |Gavin Andresen |Standard |Final
|[[bip-12]]https://github.com/bitcoin/bips/blob/master/bip-0012.mediawiki[BIP-12] |OP_EVAL |Gavin Andresen |Standard |Withdrawn
|[[bip-13]]https://github.com/bitcoin/bips/blob/master/bip-0013.mediawiki[BIP-13] |Address Format for pay-to-script-hash |Gavin Andresen |Standard |Final
|[[bip-14]]https://github.com/bitcoin/bips/blob/master/bip-0014.mediawiki[BIP-14] |Protocol Version and User Agent |Amir Taaki, Patrick Strateman |Standard |Final
|[[bip-15]]https://github.com/bitcoin/bips/blob/master/bip-0015.mediawiki[BIP-15] |Aliases |Amir Taaki |Standard |Deferred
|[[bip-16]]https://github.com/bitcoin/bips/blob/master/bip-0016.mediawiki[BIP-16] |Pay to Script Hash |Gavin Andresen |Standard |Final
|[[bip-17]]https://github.com/bitcoin/bips/blob/master/bip-0017.mediawiki[BIP-17] |OP_CHECKHASHVERIFY (CHV) |Luke Dashjr |Standard |Withdrawn
|[[bip-18]]https://github.com/bitcoin/bips/blob/master/bip-0018.mediawiki[BIP-18] |hashScriptCheck |Luke Dashjr |Standard |Proposed
|[[bip-19]]https://github.com/bitcoin/bips/blob/master/bip-0019.mediawiki[BIP-19] |M-of-N Standard Transactions (Low SigOp) |Luke Dashjr |Standard |Draft
|[[bip-20]]https://github.com/bitcoin/bips/blob/master/bip-0020.mediawiki[BIP-20] |URI Scheme |Luke Dashjr |Standard |Replaced
|[[bip-21]]https://github.com/bitcoin/bips/blob/master/bip-0021.mediawiki[BIP-21] |URI Scheme |Nils Schneider, Matt Corallo |Standard |Final
|[[bip-22]]https://github.com/bitcoin/bips/blob/master/bip-0022.mediawiki[BIP-22] |getblocktemplate - Fundamentals |Luke Dashjr |Standard |Final
|[[bip-23]]https://github.com/bitcoin/bips/blob/master/bip-0023.mediawiki[BIP-23] |getblocktemplate - Pooled Mining |Luke Dashjr |Standard |Final
|[[bip-30]]https://github.com/bitcoin/bips/blob/master/bip-0030.mediawiki[BIP-30] |Duplicate transactions |Pieter Wuille |Standard |Final
|[[bip-31]]https://github.com/bitcoin/bips/blob/master/bip-0031.mediawiki[BIP-31] |Pong message |Mike Hearn |Standard |Final
|[[bip-32]]https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki[BIP-32] |Hierarchical Deterministic Wallets |Pieter Wuille |Informational |Final
|[[bip-33]]https://github.com/bitcoin/bips/blob/master/bip-0033.mediawiki[BIP-33] |Stratized Nodes |Amir Taaki |Standard |Draft
|[[bip-34]]https://github.com/bitcoin/bips/blob/master/bip-0034.mediawiki[BIP-34] |Block v2, Height in Coinbase |Gavin Andresen |Standard |Final
|[[bip-35]]https://github.com/bitcoin/bips/blob/master/bip-0035.mediawiki[BIP-35] |mempool message |Jeff Garzik |Standard |Final
|[[bip-36]]https://github.com/bitcoin/bips/blob/master/bip-0036.mediawiki[BIP-36] |Custom Services |Stefan Thomas |Standard |Draft
|[[bip-37]]https://github.com/bitcoin/bips/blob/master/bip-0037.mediawiki[BIP-37] |Connection Bloom filtering |Mike Hearn, Matt Corallo |Standard |Final
|[[bip-38]]https://github.com/bitcoin/bips/blob/master/bip-0038.mediawiki[BIP-38] |Passphrase-protected private key |Mike Caldwell, Aaron Voisine |Standard |Draft
|[[bip-39]]https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki[BIP-39] |Mnemonic code for generating deterministic keys |Marek Palatinus, Pavol Rusnak, Aaron Voisine, Sean Bowe |Standard |Proposed
|[[bip-40]]https://github.com/bitcoin/bips/blob/master/bip-0040.mediawiki[BIP-40] |Stratum wire protocol |Marek Palatinus |Standard |BIP number allocated
|[[bip-41]]https://github.com/bitcoin/bips/blob/master/bip-0041.mediawiki[BIP-41] |Stratum mining protocol |Marek Palatinus |Standard |BIP number allocated
|[[bip-42]]https://github.com/bitcoin/bips/blob/master/bip-0042.mediawiki[BIP-42] |A finite monetary supply for Bitcoin |Pieter Wuille |Standard |Draft
|[[bip-43]]https://github.com/bitcoin/bips/blob/master/bip-0043.mediawiki[BIP-43] |Purpose Field for Deterministic Wallets |Marek Palatinus, Pavol Rusnak |Informational |Draft
|[[bip-44]]https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki[BIP-44] |Multi-Account Hierarchy for Deterministic Wallets |Marek Palatinus, Pavol Rusnak |Standard |Proposed
|[[bip-45]]https://github.com/bitcoin/bips/blob/master/bip-0045.mediawiki[BIP-45] |Structure for Deterministic P2SH Multisignature Wallets |Manuel Araoz, Ryan X. Charles, Matias Alejo Garcia |Standard |Proposed
|[[bip-47]]https://github.com/bitcoin/bips/blob/master/bip-0047.mediawiki[BIP-47] |Reusable Payment Codes for Hierarchical Deterministic Wallets |Justus Ranvier |Informational |Draft
|[[bip-49]]https://github.com/bitcoin/bips/blob/master/bip-0049.mediawiki[BIP-49] |Derivation scheme for P2WPKH-nested-in-P2SH based accounts |Daniel Weigl |Informational |Draft
|[[bip-50]]https://github.com/bitcoin/bips/blob/master/bip-0050.mediawiki[BIP-50] |March 2013 Chain Fork Post-Mortem |Gavin Andresen |Informational |Final
|[[bip-60]]https://github.com/bitcoin/bips/blob/master/bip-0060.mediawiki[BIP-60] |Fixed Length "version" Message (Relay-Transactions Field) |Amir Taaki |Standard |Draft
|[[bip-61]]https://github.com/bitcoin/bips/blob/master/bip-0061.mediawiki[BIP-61] |Reject P2P message |Gavin Andresen |Standard |Final
|[[bip-62]]https://github.com/bitcoin/bips/blob/master/bip-0062.mediawiki[BIP-62] |Dealing with malleability |Pieter Wuille |Standard |Withdrawn
|[[bip-63]]https://github.com/bitcoin/bips/blob/master/bip-0063.mediawiki[BIP-63] |Stealth Addresses |Peter Todd |Standard |BIP number allocated
|[[bip-64]]https://github.com/bitcoin/bips/blob/master/bip-0064.mediawiki[BIP-64] |getutxo message |Mike Hearn |Standard |Draft
|[[bip-65]]https://github.com/bitcoin/bips/blob/master/bip-0065.mediawiki[BIP-65] |OP_CHECKLOCKTIMEVERIFY |Peter Todd |Standard |Final
|[[bip-66]]https://github.com/bitcoin/bips/blob/master/bip-0066.mediawiki[BIP-66] |Strict DER signatures |Pieter Wuille |Standard |Final
|[[bip-67]]https://github.com/bitcoin/bips/blob/master/bip-0067.mediawiki[BIP-67] |Deterministic Pay-to-script-hash multi-signature addresses through public key sorting |Thomas Kerin, Jean-Pierre Rupp, Ruben de Vries |Standard |Proposed
|[[bip-68]]https://github.com/bitcoin/bips/blob/master/bip-0068.mediawiki[BIP-68] |Relative lock-time using consensus-enforced sequence numbers |Mark Friedenbach, BtcDrak, Nicolas Dorier, kinoshitajona |Standard |Final
|[[bip-69]]https://github.com/bitcoin/bips/blob/master/bip-0069.mediawiki[BIP-69] |Lexicographical Indexing of Transaction Inputs and Outputs |Kristov Atlas |Informational |Proposed
|[[bip-70]]https://github.com/bitcoin/bips/blob/master/bip-0070.mediawiki[BIP-70] |Payment Protocol |Gavin Andresen, Mike Hearn |Standard |Final
|[[bip-71]]https://github.com/bitcoin/bips/blob/master/bip-0071.mediawiki[BIP-71] |Payment Protocol MIME types |Gavin Andresen |Standard |Final
|[[bip-72]]https://github.com/bitcoin/bips/blob/master/bip-0072.mediawiki[BIP-72] |bitcoin: uri extensions for Payment Protocol |Gavin Andresen |Standard |Final
|[[bip-73]]https://github.com/bitcoin/bips/blob/master/bip-0073.mediawiki[BIP-73] |Use "Accept" header for response type negotiation with Payment Request URLs |Stephen Pair |Standard |Final
|[[bip-74]]https://github.com/bitcoin/bips/blob/master/bip-0074.mediawiki[BIP-74] |Allow zero value OP_RETURN in Payment Protocol |Toby Padilla |Standard |Draft
|[[bip-75]]https://github.com/bitcoin/bips/blob/master/bip-0075.mediawiki[BIP-75] |Out of Band Address Exchange using Payment Protocol Encryption |Justin Newton, Matt David, Aaron Voisine, James MacWhyte |Standard |Draft
|[[bip-80]]https://github.com/bitcoin/bips/blob/master/bip-0080.mediawiki[BIP-80] |Hierarchy for Non-Colored Voting Pool Deterministic Multisig Wallets |Justus Ranvier, Jimmy Song |Informational |Deferred
|[[bip-81]]https://github.com/bitcoin/bips/blob/master/bip-0081.mediawiki[BIP-81] |Hierarchy for Colored Voting Pool Deterministic Multisig Wallets |Justus Ranvier, Jimmy Song |Informational |Deferred
|[[bip-83]]https://github.com/bitcoin/bips/blob/master/bip-0083.mediawiki[BIP-83] |Dynamic Hierarchical Deterministic Key Trees |Eric Lombrozo |Standard |Draft
|[[bip-90]]https://github.com/bitcoin/bips/blob/master/bip-0090.mediawiki[BIP-90] |Buried Deployments |Suhas Daftuar |Informational |Draft
|[[bip-99]]https://github.com/bitcoin/bips/blob/master/bip-0099.mediawiki[BIP-99] |Motivation and deployment of consensus rule changes ([soft/hard]forks) |Jorge Timón |Informational |Draft
|[[bip-101]]https://github.com/bitcoin/bips/blob/master/bip-0101.mediawiki[BIP-101] |Increase maximum block size |Gavin Andresen |Standard |Withdrawn
|[[bip-102]]https://github.com/bitcoin/bips/blob/master/bip-0102.mediawiki[BIP-102] |Block size increase to 2MB |Jeff Garzik |Standard |Draft
|[[bip-103]]https://github.com/bitcoin/bips/blob/master/bip-0103.mediawiki[BIP-103] |Block size following technological growth |Pieter Wuille |Standard |Draft
|[[bip-104]]https://github.com/bitcoin/bips/blob/master/bip-0104.mediawiki[BIP-104] |'Block75' - Max block size like difficulty |t.khan |Standard |Draft
|[[bip-105]]https://github.com/bitcoin/bips/blob/master/bip-0105.mediawiki[BIP-105] |Consensus based block size retargeting algorithm |BtcDrak |Standard |Draft
|[[bip-106]]https://github.com/bitcoin/bips/blob/master/bip-0106.mediawiki[BIP-106] |Dynamically Controlled Bitcoin Block Size Max Cap |Upal Chakraborty |Standard |Draft
|[[bip-107]]https://github.com/bitcoin/bips/blob/master/bip-0107.mediawiki[BIP-107] |Dynamic limit on the block size |Washington Y. Sanchez |Standard |Draft
|[[bip-109]]https://github.com/bitcoin/bips/blob/master/bip-0109.mediawiki[BIP-109] |Two million byte size limit with sigop and sighash limits |Gavin Andresen |Standard |Rejected
|[[bip-111]]https://github.com/bitcoin/bips/blob/master/bip-0111.mediawiki[BIP-111] |NODE_BLOOM service bit |Matt Corallo, Peter Todd |Standard |Proposed
|[[bip-112]]https://github.com/bitcoin/bips/blob/master/bip-0112.mediawiki[BIP-112] |CHECKSEQUENCEVERIFY |BtcDrak, Mark Friedenbach, Eric Lombrozo |Standard |Final
|[[bip-113]]https://github.com/bitcoin/bips/blob/master/bip-0113.mediawiki[BIP-113] |Median time-past as endpoint for lock-time calculations |Thomas Kerin, Mark Friedenbach |Standard |Final
|[[bip-114]]https://github.com/bitcoin/bips/blob/master/bip-0114.mediawiki[BIP-114] |Merkelized Abstract Syntax Tree |Johnson Lau |Standard |Draft
|[[bip-120]]https://github.com/bitcoin/bips/blob/master/bip-0120.mediawiki[BIP-120] |Proof of Payment |Kalle Rosenbaum |Standard |Draft
|[[bip-121]]https://github.com/bitcoin/bips/blob/master/bip-0121.mediawiki[BIP-121] |Proof of Payment URI scheme |Kalle Rosenbaum |Standard |Draft
|[[bip-122]]https://github.com/bitcoin/bips/blob/master/bip-0122.mediawiki[BIP-122] |URI scheme for Blockchain references / exploration |Marco Pontello |Standard |Draft
|[[bip-123]]https://github.com/bitcoin/bips/blob/master/bip-0123.mediawiki[BIP-123] |BIP Classification |Eric Lombrozo |Process |Active
|[[bip-124]]https://github.com/bitcoin/bips/blob/master/bip-0124.mediawiki[BIP-124] |Hierarchical Deterministic Script Templates |Eric Lombrozo, William Swanson |Informational |Draft
|[[bip-125]]https://github.com/bitcoin/bips/blob/master/bip-0125.mediawiki[BIP-125] |Opt-in Full Replace-by-Fee Signaling |David A. Harding, Peter Todd |Standard |Proposed
|[[bip-126]]https://github.com/bitcoin/bips/blob/master/bip-0126.mediawiki[BIP-126] |Best Practices for Heterogeneous Input Script Transactions |Kristov Atlas |Informational |Draft
|[[bip-130]]https://github.com/bitcoin/bips/blob/master/bip-0130.mediawiki[BIP-130] |sendheaders message |Suhas Daftuar |Standard |Proposed
|[[bip-131]]https://github.com/bitcoin/bips/blob/master/bip-0131.mediawiki[BIP-131] |"Coalescing Transaction" Specification (wildcard inputs) |Chris Priest |Standard |Draft
|[[bip-132]]https://github.com/bitcoin/bips/blob/master/bip-0132.mediawiki[BIP-132] |Committee-based BIP Acceptance Process |Andy Chase |Process |Withdrawn
|[[bip-133]]https://github.com/bitcoin/bips/blob/master/bip-0133.mediawiki[BIP-133] |feefilter message |Alex Morcos |Standard |Draft
|[[bip-134]]https://github.com/bitcoin/bips/blob/master/bip-0134.mediawiki[BIP-134] |Flexible Transactions |Tom Zander |Standard |Draft
|[[bip-140]]https://github.com/bitcoin/bips/blob/master/bip-0140.mediawiki[BIP-140] |Normalized TXID |Christian Decker |Standard |Draft
|[[bip-141]]https://github.com/bitcoin/bips/blob/master/bip-0141.mediawiki[BIP-141] |Segregated Witness (Consensus layer) |Eric Lombrozo, Johnson Lau, Pieter Wuille |Standard |Draft
|[[bip-142]]https://github.com/bitcoin/bips/blob/master/bip-0142.mediawiki[BIP-142] |Address Format for Segregated Witness |Johnson Lau |Standard |Deferred
|[[bip-143]]https://github.com/bitcoin/bips/blob/master/bip-0143.mediawiki[BIP-143] |Transaction Signature Verification for Version 0 Witness Program |Johnson Lau, Pieter Wuille |Standard |Draft
|[[bip-144]]https://github.com/bitcoin/bips/blob/master/bip-0144.mediawiki[BIP-144] |Segregated Witness (Peer Services) |Eric Lombrozo, Pieter Wuille |Standard |Draft
|[[bip-145]]https://github.com/bitcoin/bips/blob/master/bip-0145.mediawiki[BIP-145] |getblocktemplate Updates for Segregated Witness |Luke Dashjr |Standard |Draft
|[[bip-146]]https://github.com/bitcoin/bips/blob/master/bip-0146.mediawiki[BIP-146] |Dealing with signature encoding malleability |Johnson Lau, Pieter Wuille |Standard |Draft
|[[bip-147]]https://github.com/bitcoin/bips/blob/master/bip-0147.mediawiki[BIP-147] |Dealing with dummy stack element malleability |Johnson Lau |Standard |Draft
|[[bip-148]]https://github.com/bitcoin/bips/blob/master/bip-0148.mediawiki[BIP-148] |Mandatory activation of segwit deployment |Shaolin Fry |Standard |Draft
|[[bip-150]]https://github.com/bitcoin/bips/blob/master/bip-0150.mediawiki[BIP-150] |Peer Authentication |Jonas Schnelli |Standard |Draft
|[[bip-151]]https://github.com/bitcoin/bips/blob/master/bip-0151.mediawiki[BIP-151] |Peer-to-Peer Communication Encryption |Jonas Schnelli |Standard |Draft
|[[bip-152]]https://github.com/bitcoin/bips/blob/master/bip-0152.mediawiki[BIP-152] |Compact Block Relay |Matt Corallo |Standard |Draft
|[[bip-171]]https://github.com/bitcoin/bips/blob/master/bip-0171.mediawiki[BIP-171] |Currency/exchange rate information API |Luke Dashjr |Standard |Draft
|[[bip-180]]https://github.com/bitcoin/bips/blob/master/bip-0180.mediawiki[BIP-180] |Block size/weight fraud proof |Luke Dashjr |Standard |Draft
|[[bip-199]]https://github.com/bitcoin/bips/blob/master/bip-0199.mediawiki[BIP-199] |Hashed Time-Locked Contract transactions |Sean Bowe, Daira Hopwood |Standard |Draft((("", startref="BIPsnap15")))
|=======================================================================