<p>I have found what I was missing.</p>

<p>Dogecoin switch to merged mining so the header has a new structure which I didn't know about. I found this wikipedia page (<a href="https://en.bitcoin.it/wiki/Merged_mining_specification#Merkle_Branch" rel="nofollow noreferrer">https://en.bitcoin.it/wiki/Merged_mining_specification#Merkle_Branch</a>) which explain everything.</p>

<p>I should have noticed also that my nonce is 0. When I see this and that the next bit is not null I can extend my structure to a merged mining header.</p>

<p>I hope it will help people.</p>

CC BY-SA 4.0
2018-05-19T18:27:42.397Z
2018-05-20T17:35:03.233Z
2018-05-20T17:35:03.233Z
rllola
<p>I am coding an spv node for dogecoin. I am syncing the headers and I am exceping to have nTx=0 for all the headers received but for one of the headers i have a nTx = 2 and some weird data following...</p>

<pre><code>{ version: 6422786,
 previousHash: 'b7ac5cc3ca94d8b154661cba795fc4912f3b6ce83a3c5669053e7f677b360dab',
 merklerootHash: 'd55d5c789080a64707a528ce06c80b36708910d80126f0b0f5c5a73534333354',
 time: 1407228150,
 nBits: 503697504,
 nonce: 0,
 hash: '47cf9eaf17f37672ef610c15c6aeb5257c318e76943b809d79c6fb486fd36115',
 transactionCount: 2 }
</code></pre>

<p>I am doing something wrong ?</p>

CC BY-SA 4.0
2018-05-19T14:26:03.630Z
I think I might have found what I am doing wrong. At one point Dogecoin switch to AuxPow and so I believe that the headers might have a diifferent structure that the one in Bitcoin (because of the lack of documentation for DOGE I use the Bitcoin ones). Here a page which explain the differences : https://en.bitcoin.it/wiki/Merged_mining_specification
rllola
<dogecoin><spv>
My spv node received in a nTx = 2 in headers message
rllola
# My spv node received in a nTx = 2 in headers message

(Asked by: username_0 on 2018-05-19)

I am coding an spv node for dogecoin. I am syncing the headers and I am exceping to have nTx=0 for all the headers received but for one of the headers i have a nTx = 2 and some weird data following...
{ version: 6422786,
 previousHash: 'b7ac5cc3ca94d8b154661cba795fc4912f3b6ce83a3c5669053e7f677b360dab',
 merklerootHash: 'd55d5c789080a64707a528ce06c80b36708910d80126f0b0f5c5a73534333354',
 time: 1407228150,
 nBits: 503697504,
 nonce: 0,
 hash: '47cf9eaf17f37672ef610c15c6aeb5257c318e76943b809d79c6fb486fd36115',
 transactionCount: 2 }

I am doing something wrong ?

**Tags:** dogecoin, spv

> **Comments:**
> **username_0**: I think I might have found what I am doing wrong. At one point Dogecoin switch to AuxPow and so I believe that the headers might have a diifferent structure that the one in Bitcoin (because of the lack of documentation for DOGE I use the Bitcoin ones). Here a page which explain the differences : https://en.bitcoin.it/wiki/Merged_mining_specification  

---

## 1 answers

### Answer by username_0 on 2018-05-19. Score: 1 | Accepted answer

I have found what I was missing.

Dogecoin switch to merged mining so the header has a new structure which I didn't know about. I found this wikipedia page (<https://en.bitcoin.it/wiki/Merged_mining_specification#Merkle_Branch>) which explain everything.

I should have noticed also that my nonce is 0. When I see this and that the next bit is not null I can extend my structure to a merged mining header.

I hope it will help people.


---

