{
  "manageEntity": {
    "action": "Create",
    "entityId": "533089014",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"entity_type\":\"Track\",\"user_id\":868248368,\"entity_id\":1285604129,\"body\":\"very nice track!\",\"comment_id\":533089014,\"track_timestamp_s\":39,\"mentions\":[]}}",
    "nonce": "0xc0bcc1778f4b9c71417f573c42ce8e22b15d65324021db60c6e7b6db84efc68c",
    "signature": "0x452a6a3cd100884fbab5ed72b2a2a0a98789aa0d8ae244be41ee1310f5d8047271939a162d5e647378f7bf12f44eae884b2acbc3184b3fa27d8bac885a6c41391b",
    "signer": "0x9B1Bddbfd19BB66717F178D531ce37dC714fAA1E",
    "userId": "868248368"
  }
}