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2019-12-05 12:52:18 -05:00
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protocol/network/messages/version.md
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The version message is a part of the node connection handshake and indicates various connection settings, networking information, and the services provided by the sending node (see Services Bitmask below).
The node connection is not considered established until both nodes have sent and received both a [version](/protocol/network/messages/version) and [verack](/protocol/network/messages/verack) message.
## Message Format
| Field | Length | Format | Description |
|--|--|--|--|
| version | 4 bytes | uint | |
| services | 8 bytes | bitmask | |
| timestamp | 8 bytes | unix timestamp | |
| remote address | 26 bytes | network address | |
| local address | 26 bytes | network address | |
| nonce | 8 bytes | big-endian bytes | |
| user agent | variable | string | | |
| block height | 4 bytes | uint | | |
| relay indicator | 1 byte | boolean | | |
| version | 4 bytes | uint | The version number supported by the sending node. |
| services | 8 bytes | bitmask | An indication of the services supported by the sending node. See Services Bitmask section below. |
| timestamp | 8 bytes | unix timestamp | The time the message was generated on the sending node. |
| remote address | 26 bytes | network address | The network address of the remote node. |
| local address | 26 bytes | network address | The network address of the sending node. |
| nonce | 8 bytes | big-endian bytes | Random nonce for the connection, used to detect connections to self. |
| user agent | variable | string | A user agent string identifying the node implementation as described in [BIP-14](https://github.com/bitcoin/bips/blob/master/bip-0014.mediawiki). |
| block height | 4 bytes | uint | The height of the block with the highest height known to the sending node. |
| relay flag | 1 byte | boolean | Indicates whether the sending node would like all broadcasted transactions relayed to it. See [BIP-37](https://github.com/bitcoin/bips/blob/master/bip-0037.mediawiki). |
## Services Bitmask
The services field is an 8 byte little-endian-serialized bitfield that described peer capabilities. The following capabilities are defined, by bit position: