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10 sats \ 1 reply \ @tidwell OP 9h \ on: Quick questions about OP_RETURN? Quick answers here. bitcoin
Why would a spammer use OP_RETURN if it's cheaper to use Witness data to store arbitrary data?
OP_RETURN data is signed by the signatures in inputs, and therefore cannot be malleated, while at least the signatures in witness data are malleable. Some users also perceive OP_RETURN as the "correct/righteous" way to embed data.
OP_RETURN outputs are also slightly cheaper for small data payloads up to 143 bytes, but more expensive for bigger data payloads.
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