<p><code>1111111111111111111114oLvT2</code> is the P2PKH address derived from a HASH160 consisting of all 0s.</p>

<p><code>mfWxJ45yp2SFn7UciZyNpvDKrzbhyfKrY8</code> is the same P2PKH address, but in its testnet encoding.</p>

<p>These are well known burn addresses, and any coins sent to either of them will be permanently lost. The example you linked uses them as they are easy to search for (which I don't really follow - any known address is easy to search for). You should replace them with an address for which you have the private key in your own code.</p>

CC BY-SA 4.0
2019-10-28T10:49:42.483Z
Can you elaborate on the last sentence, please? Why do I need to do that? Does it relate to [this](https://bitcoin.stackexchange.com/questions/91313/who-do-i-send-money-to-if-i-want-to-create-an-op-return-transaction)?
Lance Pollard
CC BY-SA 4.0
2019-10-28T10:41:23.973Z
2019-10-28T10:41:23.973Z
Raghav Sood
<p><a href="https://bitcoin.stackexchange.com/questions/25224/what-is-a-step-by-step-way-to-insert-data-in-op-return/36439#36439">Here</a> we see:</p>

<pre><code>mainnet = 0
if mainnet:
    dummy_address = "1111111111111111111114oLvT2"
else:
    dummy_address = "mfWxJ45yp2SFn7UciZyNpvDKrzbhyfKrY8"
</code></pre>

<p>What is this? No explanation is given. Can I create my own dummy address? What is this doing exactly, with some detail?</p>

<address><testnet>
What is the dummy_address when creating an OP_RETURN in this example?
Lance Pollard
# What is the dummy_address when creating an OP_RETURN in this example?

(Asked by: username_0 on 2019-10-28)

[Here](https://bitcoin.stackexchange.com/questions/25224/what-is-a-step-by-step-way-to-insert-data-in-op-return/36439#36439) we see:

```
mainnet = 0
if mainnet:
    dummy_address = "1111111111111111111114oLvT2"
else:
    dummy_address = "mfWxJ45yp2SFn7UciZyNpvDKrzbhyfKrY8"

```

What is this? No explanation is given. Can I create my own dummy address? What is this doing exactly, with some detail?

**Tags:** address, testnet


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## 1 answers

### Answer by username_1 on 2019-10-28. Score: 1

`1111111111111111111114oLvT2` is the P2PKH address derived from a HASH160 consisting of all 0s.

`mfWxJ45yp2SFn7UciZyNpvDKrzbhyfKrY8` is the same P2PKH address, but in its testnet encoding.

These are well known burn addresses, and any coins sent to either of them will be permanently lost. The example you linked uses them as they are easy to search for (which I don't really follow - any known address is easy to search for). You should replace them with an address for which you have the private key in your own code.

> **Comments:**
> **username_0**: Can you elaborate on the last sentence, please? Why do I need to do that? Does it relate to [this](https://bitcoin.stackexchange.com/questions/91313/who-do-i-send-money-to-if-i-want-to-create-an-op-return-transaction)?  

---

