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I was messing around on the blockchain learning about OP_RETURN outputs and the equivalent use of Input Data in Ethereum and came across something interesting and I can't make sense of it.

It starts with a ETH transaction:

0xd304e780755f46e62a42884421e39af06342f0a4989704ee02989043769c4f93

When decoded, the input data mentions a Bitcoin address:

bc1q0rggj4h837qcldhv8hwxpva32nf645excexqq2

When I looked at this Bitcoin address I noticed the following transaction:

444a6542a01d6ce10c9fe01e323447fcf73047b78d8de10a05fa14243233a3a2

Based on the timing and values in the ETH and BTC transactions I figured this was some kind of coin exchange (they were swapping ETH for BTC) which I thought was rather neat as I never thought of using OP_RETURN in this way. But then I noticed that in the Bitcoin transaction above we have another OP_RETURN output which decodes to:

OUT:D304E780755F46E62A42884421E39AF06342F0A4989704EE02989043769C4F93 <-- there is a space on the end

First I thought this might be a Doge Coin address as it starts with "D" but it is too long and now my curiosity has the better of me. Does anyone know what that D304... might be?

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The decoded OP_RETURN output

OUT:D304E780755F46E62A42884421E39AF06342F0A4989704EE02989043769C4F93

matches the transaction identifier of the Ethereum transaction you mention first

0xd304e780755f46e62a42884421e39af06342f0a4989704ee02989043769c4f93
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  • Don't know how I didn't see that. I got so hung up on it being a hex encoding and trying to decode it. Commented Jan 18 at 3:48

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