hash – How to calculate Merkle root? Need a twist?
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Episode 27
I downloaded the necessary information and created Coinbase. Then I calculated the merkle root… but when I submit the block I always get the error message “bad-txnmerkleroot”. Here is my code:
def dblsha(d)->bytes:
return hashlib.sha256(hashlib.sha256(d).digest()).digest()
def makeMerkleRoot()->None:
global merkleroot,txnlist
txnlist=(coinbase)+(unhexlify(a('data')) for a in tmpl('transactions'))
merklehashes=(dblsha
while len(merklehashes)>1:
if len(merklehashes)%2:
merklehashes.append(merklehashes(-1))
merklehashes=(dblsha(merklehashes(i)+merklehashes(i+1)) for i in range(0,len(merklehashes),2))
merkleroot=merklehashes(0)(::-1)
- All transaction data has been reversed (including Coinbase).
- Calculated hash (bytes).
- Calculated the merkle root (bytes).
- I reversed the Merkroot.
- Converted merkleroot (bytes) to hexadecimal. However, no matter how many times I invert it or not, I always get the error ‘bad-txnmerkleroot’. Do I actually need to flip the data during calculations? By the way, I tested your code in regtest. Need to test your code on the main network? Are there other reasons why the ‘bad-txnmerkle’ error occurs? Like Coinbase gone wrong. I really don’t know what to do.
asked 7 hours ago
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0
There is no need to revert anything. Hashes are never reversed in Bitcoin except for human marking purposes. So if you’re starting from txids obtained from Explorer or RPC output, you’ll need to invert them (to undo the inversion), but other than that, it’s of no use.
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