Bitcoin Improvement Proposals

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A Bitcoin Improvement Proposal (BIP) is a design document for introducing features or information to Bitcoin. This is the standard way of communicating ideas since Bitcoin has no formal structure.

The first BIP (BIP 0001) was submitted by Amir Taaki on 2011-08-19 and described what a BIP is.

BIP Types

There are three types of BIPs:

  • Standards Track BIPs - Changes to the network protocol, block or transaction validation, or anything affecting interoperability.
  • Informational BIPs - Design issues, general guidelines. This type of BIP is NOT for proposing new features and do not represent community consensus
  • Process BIPs - Describes or proposes a change in process. Similar to Standards BIPs but apply outside the Bitcoin protocol.

List of BIPs

Please see the README for the up-to-date text and status.

People wishing to submit BIPs, first should propose their idea or document to the mailing list. After discussion they should email Greg Maxwell <>. After copy-editing and acceptance, it will be published here.

We are fairly liberal with approving BIPs, and try not to be too involved in decision making on behalf of the community. The exception is in very rare cases of dispute resolution when a decision is contentious and cannot be agreed upon. In those cases, the conservative option will always be preferred.

Having a BIP here does not make it a formally accepted standard until its status becomes Active. For a BIP to become Active requires the mutual consent of the community.

Those proposing changes should consider that ultimately consent may rest with the consensus of the Bitcoin users (see also: economic majority).

Number Title Owner Type Status
1 BIP Purpose and Guidelines Amir Taaki Standard Active
9 Version bits with timeout and delay Pieter Wuille, Peter Todd, Greg Maxwell, Rusty Russell Informational Draft
10 Multi-Sig Transaction Distribution Alan Reiner Informational Withdrawn
11 M-of-N Standard Transactions Gavin Andresen Standard Accepted
12 OP_EVAL Gavin Andresen Standard Withdrawn
13 Address Format for pay-to-script-hash Gavin Andresen Standard Final
14 Protocol Version and User Agent Amir Taaki, Patrick Strateman Standard Accepted
15 Aliases Amir Taaki Standard Deferred
16 Pay To Script Hash Gavin Andresen Standard Final
17 OP_CHECKHASHVERIFY (CHV) Luke Dashjr Standard Withdrawn
18 hashScriptCheck Luke Dashjr Standard Draft
19 M-of-N Standard Transactions (Low SigOp) Luke Dashjr Standard Draft
20 URI Scheme Luke Dashjr Standard Replaced
21 URI Scheme Nils Schneider, Matt Corallo Standard Accepted
22 getblocktemplate - Fundamentals Luke Dashjr Standard Accepted
23 getblocktemplate - Pooled Mining Luke Dashjr Standard Accepted
30 Duplicate transactions Pieter Wuille Standard Final
31 Pong message Mike Hearn Standard Accepted
32 Hierarchical Deterministic Wallets Pieter Wuille Informational Accepted
33 Stratized Nodes Amir Taaki Standard Draft
34 Block v2, Height in coinbase Gavin Andresen Standard Accepted
35 mempool message Jeff Garzik Standard Accepted
36 Custom Services Stefan Thomas Standard Draft
37 Bloom filtering Mike Hearn and Matt Corallo Standard Accepted
38 Passphrase-protected private key Mike Caldwell Standard Draft
39 Mnemonic code for generating deterministic keys Slush Standard Draft
40 Stratum wire protocol Slush Standard BIP number allocated
41 Stratum mining protocol Slush Standard BIP number allocated
42 A finite monetary supply for Bitcoin Pieter Wuille Standard Draft
43 Purpose Field for Deterministic Wallets Slush Standard Draft
44 Multi-Account Hierarchy for Deterministic Wallets Slush Standard Draft
45 Structure for Deterministic P2SH Multisignature Wallets Manuel Araoz Standard Draft
47 Reusable Payment Codes for Hierarchical Deterministic Wallets Justus Ranvier Informational Draft
50 March 2013 Chain Fork Post-Mortem Gavin Andresen Informational Draft
60 Fixed Length "version" Message (Relay-Transactions Field) Amir Taaki Standard Draft
61 "reject" P2P message Gavin Andresen Standard Final
62 Dealing with malleability Pieter Wuille Standard Draft
63 Stealth Addresses Peter Todd Standard BIP number allocated
64 getutxos message Mike Hearn Standard Draft
65 OP_CHECKLOCKTIMEVERIFY Peter Todd Standard Draft
66 Strict DER signatures Pieter Wuille Standard Draft
67 Deterministic P2SH multi-signature addresses Thomas Kerin Standard Draft
68 Consensus-enforced transaction replacement signalled via sequence numbers Mark Friedenbach Standard Draft
69 Lexicographical Indexing of Transaction Inputs and Outputs Kristov Atlas Standard Draft
70 Payment protocol Gavin Andresen Standard Final
71 Payment protocol MIME types Gavin Andresen Standard Final
72 Payment protocol URIs Gavin Andresen Standard Final
73 Use "Accept" header with Payment Request URLs Stephen Pair Standard Draft
99 Motivation and deployment of consensus rule changes ([soft/hard]forks) Jorge Timón Process Draft
100 Floating block size hard limit Jeff Garzik Standard Draft
101 Increase maximum block size Gavin Andresen Standard Draft
102 Block size increase to 2MB Jeff Garzik Standard Draft
103 Block size following technological growth Pieter Wuille Standard Draft
105 Consensus based block size retargeting algorithm BtcDrak Standard Draft
106 Dynamically Controlled Bitcoin Block Size Max Cap Upal Chakraborty Standard Draft
111 NODE_BLOOM service bit Matt Corallo and Peter Todd Standard Draft
112 CHECKSEQUENCEVERIFY BtcDrak and Mark Friedenbach Standard Draft
113 Median time-past as endpoint for lock-time calculations Thomas Kerin and Mark Friedenbach Standard Draft
120 Proof of Payment Kalle Rosenbaum Standard Draft
121 Proof of Payment URI scheme Kalle Rosenbaum Standard Draft
123 BIP Classification Eric Lombrozo Process Draft