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About Transactions Lifecycle

Transaction states

State Diagram

About forget

Importantly, a transaction, when sent, cannot be cancelled. One can only request forgetting about it in order to try spending (concurrently) the same UTxO in another transaction. But, the transaction may still show up later in a block and therefore, appear in the wallet.

About discover

Discovering a transaction happens regardless of a transaction being present or not as pending. Actually, only outgoing transactions are going through the pending state. Incoming ones or, outgoing ones that have been forgotten may be discovered directly in blocks.

Submitting a transaction

Sequence Diagram