What's the difference between transaction payload and OP_RETURN data?
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What's the difference between Kaspa's transaction payload and Bitcoin's OP_RETURN data?
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In Bitcoin, OP_RETURN is essentially a hack for publishing data on-chain without bloating the UTXO set:
OP_RETURN is a Bitcoin opcode that makes the script fail instantly. Therefore, an output with scriptPubKey of OP_RETURN <SOME ARBITRARY DATA> is provably unspendable and therefore Bitcoin Core v0.9 introduced a policy of excluding it from the UTXO set.
Kaspa chose to avoid such hacks, and instead dedicated a transaction field, called payload, for storing data. Since this field is not part of the output, it won't be stored in the UTXO set in the first place.
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