[[appdxbitcoinimpproposals]]
[appendix]
== Bitcoin Improvement Proposals

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 BIP0001 _BIP Purpose and Guidelines_, there are three kinds of BIP:

* A _Standards_ Track 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.
* An _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 are free to ignore Informational BIPs or follow their advice.
* A _Process_ BIP describes a process surrounding bitcoin, or proposes a change to (or an event in) a process. Process BIPs are like Standards Track BIPs but apply to areas other than the bitcoin protocol itself. They may propose an implementation, but not to bitcoin's codebase; they often require community consensus; 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 are recorded in a versioned repository on https://github.com/bitcoin/bips[GitHub]. <<table_d-1>> shows a snapshot of BIPs in the Fall of 2014. Consult the authoritative repository for up-to-date information on existing BIPs and their contents.

[[table_d-1]]
.Snapshot of BIPs
[options="header"]
|=======================================================================
|BIP# | Link | Title |Owner |Type |Status
|[[bip0001]]1|http://bit.ly/1u0zCGj|BIP Purpose and Guidelines |Amir Taaki
|Standard |Active

|[[bip0010]]10|http://bit.ly/1u0zN4g|Multi-Sig Transaction Distribution |Alan
Reiner |Informational |Draft

|[[bip0011]]11|http://bit.ly/1u0zSoH|M-of-N Standard Transactions |Gavin
Andresen |Standard |Accepted

|[[bip0012]]12|http://bit.ly/1u0zXZu|OP_EVAL |Gavin Andresen |Standard
|Withdrawn

|[[bip0013]]13|http://bit.ly/1u0A5rW|Address Format for pay-to-script-hash
|Gavin Andresen |Standard |Final

|[[bip0014]]14|link:https://github.com/bitcoin/bips/blob/master/bip-0014.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0014.mediawiki]|Protocol Version and User Agent |Amir
Taaki, Patrick Strateman |Standard |Accepted

|[[bip0015]]15|link:https://github.com/bitcoin/bips/blob/master/bip-0015.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0015.mediawiki]|Aliases |Amir Taaki |Standard |Withdrawn

|[[bip0016]]16|link:https://github.com/bitcoin/bips/blob/master/bip-0016.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0016.mediawiki]|Pay To Script Hash |Gavin Andresen
|Standard |Accepted

|[[bip0017]]17|link:https://github.com/bitcoin/bips/blob/master/bip-0017.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0017.mediawiki]|OP_CHECKHASHVERIFY (CHV) |Luke Dashjr
|Withdrawn |Draft

|[[bip0018]]18|link:https://github.com/bitcoin/bips/blob/master/bip-0018.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0018.mediawiki]|hashScriptCheck |Luke Dashjr |Standard
|Draft

|[[bip0019]]19|link:https://github.com/bitcoin/bips/blob/master/bip-0019.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0019.mediawiki]|M-of-N Standard Transactions (Low SigOp)
|Luke Dashjr |Standard |Draft

|[[bip0020]]20|link:https://github.com/bitcoin/bips/blob/master/bip-0020.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0020.mediawiki]|URI Scheme |Luke Dashjr |Standard
|Replaced

|[[bip0021]]21|link:https://github.com/bitcoin/bips/blob/master/bip-0021.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0021.mediawiki]|URI Scheme |Nils Schneider, Matt Corallo
|Standard |Accepted

|[[bip0022]]22|link:https://github.com/bitcoin/bips/blob/master/bip-0022.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0022.mediawiki]|getblocktemplate - Fundamentals |Luke
Dashjr |Standard |Accepted

|[[bip0023]]23|link:https://github.com/bitcoin/bips/blob/master/bip-0023.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0023.mediawiki]|getblocktemplate - Pooled Mining |Luke
Dashjr |Standard |Accepted

|[[bip0030]]30|link:https://github.com/bitcoin/bips/blob/master/bip-0030.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0030.mediawiki]|Duplicate transactions |Pieter Wuille
|Standard |Accepted

|[[bip0031]]31|link:https://github.com/bitcoin/bips/blob/master/bip-0031.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0031.mediawiki]|Pong message |Mike Hearn |Standard
|Accepted

|[[bip0032]]32|link:https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki]|Hierarchical Deterministic Wallets |Pieter
Wuille |Informational |Accepted

|[[bip0033]]33|link:https://github.com/bitcoin/bips/blob/master/bip-0033.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0033.mediawiki]|Stratized Nodes |Amir Taaki |Standard
|Draft

|[[bip0034]]34|link:https://github.com/bitcoin/bips/blob/master/bip-0034.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0034.mediawiki]|Block v2, Height in coinbase |Gavin
Andresen |Standard |Accepted

|[[bip0035]]35|link:https://github.com/bitcoin/bips/blob/master/bip-0035.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0035.mediawiki]|mempool message |Jeff Garzik |Standard
|Accepted

|[[bip0036]]36|link:https://github.com/bitcoin/bips/blob/master/bip-0036.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0036.mediawiki]|Custom Services |Stefan Thomas |Standard
|Draft

|[[bip0037]]37|link:https://github.com/bitcoin/bips/blob/master/bip-0037.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0037.mediawiki]|Bloom filtering |Mike Hearn and Matt
Corallo |Standard |Accepted

|[[bip0038]]38|link:https://github.com/bitcoin/bips/blob/master/bip-0038.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0038.mediawiki]|Passphrase-protected private key |Mike
Caldwell |Standard |Draft

|[[bip0039]]39|link:https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki]|Mnemonic code for generating deterministic
keys |Slush |Standard |Draft

|[[bip0040]]40|link:https://github.com/bitcoin/bips/blob/master/bip-0040.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0040.mediawiki]|Stratum wire protocol |Slush |Standard |BIP number allocated

|[[bip0041]]41|link:https://github.com/bitcoin/bips/blob/master/bip-0041.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0041.mediawiki]|Stratum mining protocol |Slush |Standard |BIP number allocated

|[[bip0042]]42|link:https://github.com/bitcoin/bips/blob/master/bip-0042.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0042.mediawiki]|A finite monetary supply for bitcoin
|Pieter Wuille |Standard |Draft

|[[bip0043]]43|link:https://github.com/bitcoin/bips/blob/master/bip-0043.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0043.mediawiki]|Purpose Field for Deterministic Wallets
|Slush |Standard |Draft

|[[bip0044]]44|link:https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki]|Multi-Account Hierarchy for Deterministic
Wallets |Slush |Standard |Draft

|[[bip0050]]50|link:https://github.com/bitcoin/bips/blob/master/bip-0050.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0050.mediawiki]|March 2013 Chain Fork Post-Mortem |Gavin
Andresen |Informational |Draft

|[[bip0060]]60|link:https://github.com/bitcoin/bips/blob/master/bip-0060.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0060.mediawiki]|Fixed Length "version" Message
(Relay-Transactions Field) |Amir Taaki |Standard |Draft

|[[bip0061]]61|link:https://github.com/bitcoin/bips/blob/master/bip-0061.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0061.mediawiki]|"reject" P2P message |Gavin Andresen
|Standard |Draft

|[[bip0062]]62|link:https://github.com/bitcoin/bips/blob/master/bip-0062.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0062.mediawiki]|Dealing with malleability |Pieter Wuille
|Standard |Draft

|[[bip0063]]63|link:https://github.com/bitcoin/bips/blob/master/bip-0063.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0063.mediawiki]|Stealth Addresses |Peter Todd |Standard |BIP number allocated

|[[bip0064]]64|link:https://github.com/bitcoin/bips/blob/master/bip-0064.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0064.mediawiki]|getutxos message |Mike Hearn |Standard
|Draft

|[[bip0070]]70|link:https://github.com/bitcoin/bips/blob/master/bip-0070.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0070.mediawiki]|Payment protocol |Gavin Andresen |Standard
|Draft

|[[bip0071]]71|link:https://github.com/bitcoin/bips/blob/master/bip-0071.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0071.mediawiki]|Payment protocol MIME types |Gavin
Andresen |Standard |Draft

|[[bip0072]]72|link:https://github.com/bitcoin/bips/blob/master/bip-0072.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0072.mediawiki]|Payment protocol URIs |Gavin Andresen
|Standard |Draft

|[[bip0073]]73|link:https://github.com/bitcoin/bips/blob/master/bip-0073.mediawiki[https://github.com/bitcoin/bips/blob/master/bip-0073.mediawiki]|Use "Accept" header with Payment Request
URLs |Stephen Pair |Standard |Draft
|=======================================================================