{
  "address": "0xcfcb12d849569a3d1cf971721665b2dce0279a91",
  "msg": "0x4469672066726f6d20626974636f696e74616c6b2c206e6f7420746865206f776e65722c206a75737420666f756e64206974206f6e207468652077656220616e642077696c6c206e6576657220746f7563682074686573652073686974746f6b656e73206f7220616e7920636f696e2f746f6b656e20746861742773206e6f74206d696e652e",
  "sig": "f0842c11e60863ec78847b9f27fd2259e8a33cb7d9d8b947889afd691e7582a7413b22488149afe0a0fa30683e1d6807a45cb8ceda5c8b2900d11051edea30ad1c",
  "version": "3",
  "signer": "MEW"
}

import codecs

def decode_hex(hex_string):
    return codecs.decode(hex_string, 'hex').decode('utf-8')

hex_string = "0x4469672066726f6d20626974636f696e74616c6b2c206e6f7420746865206f776e65722c206a75737420666f756e64206974206f6e207468652077656220616e642077696c6c206e6576657220746f7563682074686573652073686974746f6b656e73206f7220616e7920636f696e2f746f6b656e20746861742773206e6f74206d696e652e"
decoded_message = decode_hex(hex_string)
print(decoded_message)

import ecdsa
import hashlib
import re

# Hexadecimal string range to use as input
start_hex_string = "0000000000000000000000000000000000000000000000020000000000000000"
end_hex_string = "000000000000000000000000000000000000000000000003ffffffffffffffff" 

# Convert hexadecimal strings to integers
start_int = int(start_hex_string, 16)
end_int = int(end_hex_string, 16) 

# Target public key to find a match for
target_public_key = "13zb1hQbWVsc2S7ZTZnP2G4undNNpdh5so"

# Iterate through the range of integers
for i in range(start_int, end_int+1):
  # Convert integer to hexadecimal string
  hex_string = hex(i)[2:]
  # Check if the string contains only hexadecimal characters
  if re.match(r'^[0-9a-fA-F]+$', hex_string):
    # Convert hexadecimal string to bytes
    hex_bytes = bytes.fromhex( '200000000000000000000000000000000000000000000003ffffffffffffffff')
  else:
    print("Invalid hexadecimal string")
    continue
  # Use SHA256 hash function to generate a private key from the bytes
  private_key = hashlib.sha256(hex_bytes).digest()
  # Use the ECDSA algorithm to create a public key from the private key
  sk = ecdsa.SigningKey.from_string(private_key, curve=ecdsa.SECP256k1)
  vk = sk.get_verifying_key()
  # Encode the public key as a hexadecimal string
  public_key = vk.to_string().hex()
  # Compare the generated public key with the target public key
  if public_key == target_public_key:
    print("Match found! Private key:", private_key.hex())
    # Save the private key here (e.g. write it to a file)
    break

  else:
    print("No match found")