# Class BSV::Wallet::Store::Models::TransmissionTxid <a id="class-BSV-Wallet-Store-Models-TransmissionTxid"></a>

**Inherits:** `Sequel::Model`

Pure membership: a wtxid carried by a transmission's BEEF. The
per-counterparty known set (BeefParty trimming) is the union of these rows
across all of a counterparty's transmissions. Rows are written only on ack
(Store#mark_transmission_acked), never on the transmission record itself — see
HLR #385 two-phase note.