pub type Channel = [u8; 32];Expand description
Identifier of a per-account communication channel, used for message replacement.
A channel is unique per (account, channel) pair: a new statement on an existing channel
replaces the previous one from the same account when it has a strictly higher expiry (see
Statement::channel). The 32 bytes are opaque to the store — it does not prescribe how a
channel id is generated. A statement with no channel is subject only to priority-based eviction.