Contains a 1-byte bool and 8-byte LE version number. Indicates that a node is willing to provide blocks via "cmpctblock" messages. May indicate that a node prefers to receive new block announcements via a "cmpctblock" message rather than an "inv", depending on message contents.
Declared in <protocol.h>
inline constexpr char const* SENDCMPCT = {"sendcmpct"};