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How to verify the signature of data returned from $ cleos get block BLOCKNUM to insure that the data returned came from the blockchain and not 'spoofed' by a man-in-the-middle?

cleos get block 132

{"producer_signature":
  "SIG_K1_JzJjQSJdXdqE9H9JDgXumppkjv2AhpJWNxXuoJzqrQsmNDBqyhrz1TnkRUMT7WbGJwpA3kyj3c9TSthJwfzb22se4CPdbD",
  ...
  "trx": {
    "id": "a4c3cd072387dbb00dd27b99b2ed6d4ea8520239a11a775fdc6036bdc690aa55",
    "signatures": [
      "SIG_K1_KVXChzbL8gnEELY72qXhBd1xYfPkez2AAFtAB1RyiwbtEkt5zRSBSzXwDotdzymB75WLi9e7i4178HXDVk8yAci5tYWTnU"
    ],

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