coinbase transaction – What’s OP_RETURN b9e11b6d?

Whereas investigating some Bitcoin coinbase transactions, I discover that quite a lot of them have an output of the shape


the place ‘…’ is 32 bytes, most likely a hash of one thing. I do know coinbase outputs can be utilized for regardless of the miner likes, so might be arbitrary. Nonetheless, I do see quite a lot of examples beginning with the very same b9e11b6d 4 bytes. Merge mining is one chance, however with some googling, I couldn’t discover examples utilizing this format.

For instance, I began by taking a look at block 733528. It has 3 op-return outputs. The primary is for merge mining with RSK, the third is the Merkle root of the signature information (indicated by the 4 bytes aa21a9ed), and the second is the thriller one I’m asking about.

The earlier block 733527 additionally has this thriller output as its fourth op-return. The block earlier than that doesn’t have such an output, however the one earlier than that does.

Even going again a number of years to dam 580000 (created 9 June 2019), I see outputs of this manner.

Can somebody establish what that is? Is it merge mining another blockchain, or is there one other function to those outputs?

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