Great idea but where do you get actually the hash from?

Raw JSON

{
  "kind": 1,
  "id": "46693441f3b45f1f726468b1467f78ad721fabae324bd4cd7a0bcb7fd39ffc14",
  "pubkey": "f901616f00a63f4f9c7881d4871a03df3d4cee7291eafd7adcbeea7c95c58e27",
  "created_at": 1777635256,
  "tags": [
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    ]
  ],
  "content": "Great idea but where do you get actually the hash from?",
  "sig": "4ac4c82424e89058936674041f818af84b304342af0a7233cfa475493d804598213ee91a7152dec1d3ff7af92a21e5bc37ea288ea3f5adc712494d9a3999bfc7"
}