verack message is sent in reply to a version message.
verack in response to a
version message indicates to the remote that its connection and version has been accepted.
There is no version negotiation functionality between nodes; therefore if the node does not accept the version supplied by the remote then the node disconnects instead of responding with a
verack message consists of only a message header; the command string is “verack”.
Command String (“verack”)(BE)
Payload Byte Count(LE)