Bitcoin Cash Specification

Request: Send Compact Blocks (“sendcmpct”)

This message notifies the peer that this node support Compact Block Relay. Node should only send this message after protocol version >= 70014. This message can indicate the High Bandwidth Relaying mode or Low Bandwidth Relaying mode by setting the Mode field. Upon receipt of this message from the peer, node should announce new block via cmpctblock message if Mode = 1, or node should announce new block via inv or header message as defined in BIP-0130.

Format

Field Length Format Description
Mode 1 byte Integer 1: High Bandwidth Relaying mode; 0: Low Bandwidth Relaying mode; Other: Invalid
Version 8 bytes Integer (LE) Must set to 1, otherwise invalid.