{
  "manageEntity": {
    "action": "Create",
    "entityId": "75514744",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"entity_type\":\"Track\",\"body\":\"inspired by frightening black hole.\\n\",\"entity_id\":1295522097,\"track_timestamp_s\":51}}",
    "nonce": "0x84b871237e3dd6b90459d8eef513660176b746ce17b07d4f765752f9cb056d7a",
    "signature": "0x10b4f325011ffa6b9968f637ff24fab5c834a105d55993caae9b77d2c388338f39eb190c2eca64bd8f632b314fc7a51fa3f9fce94f7683063e209151025282851b",
    "signer": "0x4fCF26571935c240F182d98b6630B5D3CeBC9d7B",
    "userId": "605939603"
  }
}