{
  "manageEntity": {
    "action": "Create",
    "entityId": "1197653590",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"entity_type\":\"Track\",\"user_id\":20,\"entity_id\":1356264204,\"body\":\"heat!\",\"track_timestamp_s\":19}}",
    "nonce": "0x08856e5b86b633108f5b52c514d6b2cd0a6e7b2e91982a69f8502cae34757518",
    "signature": "0x3da2755cbc0d2ec7c6271992bd554dd026236ed33ef978ef4f367587f4d8c86c6f034b3e0981299ba39860dd0994eb5e886372a9ebecb7677cd0d288b2d981de1b",
    "signer": "0x1CE93c43F8574f553E8071e946654066188B61BC",
    "userId": "20"
  }
}