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Some time a go I heard from Bitcoin Mechanic that there was a coin join implementation that inscribes some data that they need in order to determine their pricing. Is that true? Do custodians such as Liquid use OP_RETURN for anything? Other than for many forms of spam, what is OP_RETURN used for in non-coinbase transactions? Or in other words, lets say that starting from tomorrow there is no OP_RETURN other than that used in coinbase transactions, what would be broken in such scenario?

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The main use of op_return outputs is that junk gets written to op_return outputs instead of output scripts that are part of the UTXO set.

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