Bitcoin Improvement Proposals

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.

BIP Workflow

As described in BIP 0001 the workflow of a BIP is as follows:

List of BIPs

Please do not modify this page. This is a mirror of the BIP from the source Git repository here.

People wishing to submit BIPs, first should propose their idea or document to the mailing list. After discussion they should email Greg Maxwell <gmaxwell@gmail.com>. 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
10	Multi-Sig Transaction Distribution	Alan Reiner	Informational	Withdrawn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12	OP_EVAL	Gavin Andresen	Standard	Withdrawn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17	OP_CHECKHASHVERIFY (CHV)	Luke Dashjr	Standard	Withdrawn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

Hardfork Wishlist