New answers tagged hash
3
I addition to Claris' answer, if your question is about ECDSA, the hashing step is actually an essential part of the signature scheme and not just a step we choose to do before invoking it. Without it, the signature would not be secure. This is because given a public key, it is possible to compute (signature, message hash) pairs such that the signature is ...
1
Hashing ensures we get a constant length input for the signature operation.
0
Bitcoin uses double hashing almost everywhere>SHA256[SH256[X]]called Hash256 which produces a 160 bit out.Linking transaction outputs and inputs.Generating the checsum in a bitcoin address.Hashing the block in a merkle tree.
0
I figured it out, I simply was missing a step. I wasn't signing my transaction before sending.
>>> t.sign('my_private_key')
>>> res = srv.sendrawtransaction(t.raw_hex())
>>> res
{
'txid':
'8ca3d23d55dbded21a3ee8809ba55e2fa97394332020fad55582ab29e9619de4',
'response_dict':
'...
-3
c0e2d0a89a348de88fda08211c70d1d7e52ccef2eb9459911bf977d587784c6e is the k1 nonce.
a3c2dce777813dc3f0d7a105a5fd56d5894ba30ffa01ba79667cadba37a9d8df is the private key.
2
Assuming you're talking about ECDSA signing. For BIP340/Schnorr signatures, see this answer.
For valid signatures
Let:
d: the private key
P=d*G: the public key
k1: the (first) nonce
R1=k1*G: the public first nonce
r1=R1.x mod n: the public first nonce as it will be encoded in the signature.
k2=2*k1, R2=k2*G=2*R1, r2=R2.x mod n: the same for the second nonce
...
1
I solved the problem by installing the bitcoin package again.
I was getting this error message with my script doubleslow-base.py:
Traceback (most recent call last):
File "./doubleslow-base.py", line 136, in <module>
print_the_secrets(digest256_final)
File "/home/valentin/python/doubleslow/doubleslow_module.py", line 301, in ...
0
From this only for example, only for outgoing transaction
https://blockchain.info/rawtx/3090cb29cf6c4ad0572f1fc7050ee0e796c2b30a226926aff3685875acc422ef?format=hex
With this: https://cryptoxploit.com/rsz-key/
https://github.com/CryptoXploit/bitcoin-key-compression/blob/main/RawTX_RSZ.py
Top 50 recent answers are included