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I am wondering if I can inject multiple OP_RETURN outputs in one transaction?

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Can inject multiple OP_RETURN outputs in one transaction?

At the protocol level, absolutely nothing prevents you from doing this. However, such a transaction would not be considered a 'standard' transaction and would not be relayed (propagated) through the network.

Let's say, though, you were a miner yourself. Then you could mine a transaction with 100 OP_RETURN outputs in it, and no one would reject your block because of it.

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    I'm confused, because I found a transaction with three OP_RETURN outputs in it: blockchain.com/btc/tx/… So it is possible now ?
    – csstudent1418
    Aug 2, 2021 at 17:33
  • @csstudent1418 I misread the answer too. So multiple OP_RETURNs are only denied in propagating txs, not blocks. So, only a miner can do multiple OP_RETURNs as their transaction doesn't need to be propagated. The tx you point out is a coinbase tx, and thus comes from the miner.
    – Bitcoingraffiti
    Nov 8, 2021 at 14:36

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