Network Protocol Version History

Version Number	Proposed In	Summary
106	???	Added the following fields to the `version` message: `address-from`, `nonce`, `user-agent`, `current block height`
209	???	`address` message may accept a list of network addresses.
31 402	???	Time field added to `address` messages.
	BIP-0014	Network Version decoupled from Block Version. User-agent replaced sub-version number.
60 000	BIP-0031	Added pong.
70 001	BIP-0037	Added `relay` flag to the `version` message.