<p>The decoded OP_RETURN output</p>
<pre><code>OUT:D304E780755F46E62A42884421E39AF06342F0A4989704EE02989043769C4F93
</code></pre>
<p>matches the transaction identifier of the Ethereum transaction you mention first</p>
<pre><code>0xd304e780755f46e62a42884421e39af06342f0a4989704ee02989043769c4f93
</code></pre>

CC BY-SA 4.0
2024-01-18T03:48:32.280Z
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.
user2334659
CC BY-SA 4.0
2024-01-18T03:45:59.747Z
2024-01-18T03:45:59.747Z
Murch
<p>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.</p>
<p>It starts with a ETH transaction:</p>
<p><code>0xd304e780755f46e62a42884421e39af06342f0a4989704ee02989043769c4f93</code></p>
<p>When decoded, the input data mentions a Bitcoin address:</p>
<p><code>bc1q0rggj4h837qcldhv8hwxpva32nf645excexqq2</code></p>
<p>When I looked at this Bitcoin address I noticed the following transaction:</p>
<p><code>444a6542a01d6ce10c9fe01e323447fcf73047b78d8de10a05fa14243233a3a2</code></p>
<p>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:</p>
<p><code>OUT:D304E780755F46E62A42884421E39AF06342F0A4989704EE02989043769C4F93 </code> &lt;-- there is a space on the end</p>
<p>First I thought this might be a Doge Coin address as it starts with &quot;D&quot; but it is too long and now my curiosity has the better of me. Does anyone know what that D304... might be?</p>

CC BY-SA 4.0
2024-01-18T10:53:07.147Z
could be a Thorchain memo https://dev.thorchain.org/protocol-development/chain-clients/utxo.html?highlight=op_return#utxo
bca-0353f40e
<transactions><address><op-return>
What could this OP_RETURN value be
user2334659
# What could this OP_RETURN value be

(Asked by: username_0 on 2024-01-18)

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?

**Tags:** transactions, address, op-return

> **Comments:**
> **username_1**: could be a Thorchain memo https://dev.thorchain.org/protocol-development/chain-clients/utxo.html?highlight=op_return#utxo  

---

## 1 answers

### Answer by username_2 on 2024-01-18. Score: 4 | Accepted answer

The decoded OP\_RETURN output

```
OUT:D304E780755F46E62A42884421E39AF06342F0A4989704EE02989043769C4F93

```

matches the transaction identifier of the Ethereum transaction you mention first

```
0xd304e780755f46e62a42884421e39af06342f0a4989704ee02989043769c4f93

```

> **Comments:**
> **username_0**: 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.  

---

