{
  "manageEntity": {
    "action": "Create",
    "entityId": "1518942201",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"entity_type\":\"Track\",\"user_id\":52309,\"entity_id\":1885964597,\"body\":\"very nice!\",\"track_timestamp_s\":165}}",
    "nonce": "0xf3172b395bd722b5034aa377c30389357a742f761e3cb9caca8b3473b0c66102",
    "signature": "0x08fa5aa29c04a6d4b9c0be4df1cc6bc310dd4ca2175a4a569651ce87882d2f9f2edc166f2e25116a2797a3dfa67d8c3794db71028e3cb4672be0e64d1ad70c661c",
    "signer": "0x1CE93c43F8574f553E8071e946654066188B61BC",
    "userId": "52309"
  }
}