Polkadot announced the complete design of the XCMP cross-chain messaging.

Polkadot reported successful sending of XCMP cross-chain messages. XCMP is currently under development, all design and manufacturing decisions include: the transmission line is not sent to the chain link, the communication line is larger than the size limit (bytes); Parachains cannot accept messages from other Parachains, in which case the Parachain sender will be aware of the block. These nodes are responsible for routing messages between chains. The author creates a list of "out" messages and sends the receipt. In any block of messages "received" from other Parachains, Parachains must send messages from some of all other Parachains. The user acknowledges that the new candidate for the next Parachain block has requirements to access this Parachain. Note: XCMP is one of the keys to the Polkadot cross chain design, which allows crosslinking between the connections of multiple Polkadot lines.