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  1. from hashlib import sha256
  2.  
  3. digits58 = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
  4.  
  5. def decode_base58(bc, length):
  6.  n = 0
  7.  for char in bc:
  8.   n = n * 58 + digits58.index(char)
  9.  return n.to_bytes(length, 'big')
  10.  
  11. def check_bc(bc):
  12.  bcbytes = decode_base58(bc, 25)
  13.  return bcbytes[-4:] == sha256(sha256(bcbytes[:-4]).digest()).digest()[:4]
  14.  
  15. if __name__ == '__main__':
  16.  bc = '1AGNa15ZQXAZUgFiqJ2i7Z2DPU2J6hW62i'
  17.  assert check_bc(bc)
  18.  assert not check_bc( bc.replace('N', 'P', 1) )
  19.  assert check_bc('1111111111111111111114oLvT2')
  20.  assert check_bc("17NdbrSGoUotzeGCcMMCqnFkEvLymoou9j")
Success #stdin #stdout 0.03s 11108KB
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stdin
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from hashlib import sha256

digits58 = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'

def decode_base58(bc, length):
 n = 0
 for char in bc:
  n = n * 58 + digits58.index(char)
 return n.to_bytes(length, 'big')
 
def check_bc(bc):
 bcbytes = decode_base58(bc, 25)
 return bcbytes[-4:] == sha256(sha256(bcbytes[:-4]).digest()).digest()[:4]

if __name__ == '__main__':
 bc = '1AGNa15ZQXAZUgFiqJ2i7Z2DPU2J6hW62i'
 assert check_bc(bc)
 assert not check_bc( bc.replace('N', 'P', 1) )
 assert check_bc('1111111111111111111114oLvT2')
 assert check_bc("17NdbrSGoUotzeGCcMMCqnFkEvLymoou9j")
stdout
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Standard output is empty
https://ideone.com/7MMrBR
language:
Python 3 (python  3.12)
created:
4 days ago
visibility:
public

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