# What is CKB Open Transaction ## Metadata **Status**:: #x **Zettel**:: #zettel/permanent **Created**:: [[2022-09-19]] **Topic**:: [[♯ CKB Open Transaction]] **Parent**:: [[Describe the CKB Open Transaction Project]] ## Notes A CKB Open Transaction is a format to describe a partial CKB transaction and the allowed modifications. Open transaction helps multiple parties to construct a transaction at different times via incremental build or aggregation. In incremental build, participants create new open transactions or change the existing ones, then they relay the transactions to the next participant or submit the transaction to the chain. Aggregation means combining matched open transactions into one CKB transaction. Third party service can run the aggregation service for users to improve the experience. ## Prior Work A Partially Signed Bitcoin Transaction (PSBT) is a Bitcoin standard which allows multiple parties to sign the same transaction easily. ## References - (j:: [[Partially Signed Bitcoin Transaction]])