==== BIP 0014 - Protocol Version and User Agent ====
[[dido:public:ra:xapend:xapend.b_stds:defact:bitcoin:bips| return to the Bitcoin Improvement Proposals ]]

<table>
<caption>Data sheet for Protocol Version and User Agent </caption>
| Title                      | Protocol Version and User Agent  |
| Layer                      | Peer Services |
| Author                     | Amir Taaki, Patrick Strateman	 |
| Comments-Summary           | No comments yet. |
| Comments-URI               | [[https://github.com/bitcoin/bips/wiki/Comments:BIP-0014]]    |
| Status                      | Final | 
| Type                       | Standards Track | 
| Created                    | 2011-11-10  |
| Post History               | 2011-11-02 |
| Description                | [[https://github.com/bitcoin/bips/blob/master/bip-0014.mediawiki]] |
</table>

  : **Note**: The following is an excerpt from the official Bitcoin site. It is provided here as a convenience and is not authoritative. Refer to the original document(s) as the authoritative reference.

----

|  ** * * * NOTE * * * **  |
|In this document, [[dido:public:ra:xapend:xapend.a_glossary:b:bitcoin|bitcoin]] will be used to refer to the protocol while Satoshi will refer to the current [[dido:public:ra:xapend:xapend.a_glossary:c:client|client]] in order to prevent confusion. |

===  Proposal ===  
  : //The version field in ''version'' and ''getblocks'' packets will become the protocol version number. The version number in the "blocks" reflects the protocol version from when that block was created.//

  : //The currently unused ''sub_version_num field'' in ''version'' packets will become the new user-agent string.//

  : //Bitcoin user agents are a modified browser user agent with more structure to aid parsers and provide some coherence. In bitcoin, the software usually works like a stack starting from the core code-base up to the end graphical interface. Therefore the user agent strings codify this relationship.//

    : //**Basic format:**//

        /Name:Version/Name:Version/.../

    : //**Example:**//

       /Satoshi:5.64/bitcoin-qt:0.4/
       /Satoshi:5.12/Spesmilo:0.8/