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