Recently, software developer Unwriter announced BOB (Bitcoin OP_RETURN bytecode) – a new transaction serialization format for handling bitcoin transactions, especially OP_RETURN. In the introduction of BOB's Medium post, Unwriter first explained that the Planaria system exists based on a serialized format called TXO. He further pointed out that "BOB is a new modified version of TXO, which adopts the concept of abstract machine. In short, BOB is a serialized format and a convenient way to handle OP_RETURN scripts. Unwriter claims that "this is BOB's first A version that will evolve over usage patterns and feedback. So he encourages users to send questions and feedback.