Bitcoin/address validation: Difference between revisions

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     substr sha256(sha256 pack 'C*', @byte[0..20]), 0, 4;
 }</lang>
+=={{header|Python}}==
+<lang python>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(25, '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) )</lang>
+{{out}}
+No output signifying success.
 =={{header|Tcl}}==