A transaction is a cryptographically signed instruction that changes the state of the chain. Arc commits transactions under Malachite BFT consensus: once a block carries more than two thirds of the validator set's precommits it is final, permanently, and there is no confirmation window to wait out.
Unrecognised method 0x39ecce49
No published ABI and no signature directory entry names this selector, so the payload is shown exactly as it was sent. Verifying the contract's source would name it permanently.
The decoder's reason: unknown function selector