{
  "manageEntity": {
    "action": "Create",
    "entityId": "1358282563",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"entity_type\":\"Track\",\"user_id\":52309,\"entity_id\":650358338,\"body\":\"nice!\",\"track_timestamp_s\":68}}",
    "nonce": "0x72ad47be0275fb1b491dee9180d55c1fbdda4277385d9575de2231c8da96b50c",
    "signature": "0x54b8a6ba0b1f1eda6bc2fde59dfb0123962ac49c0a13009b7499cf3378bb940200bff7064cccea0d7fb6b1d735bbfd9f3d0a58bee6df8cc5d9a12d1d4d79cd871c",
    "signer": "0x1CE93c43F8574f553E8071e946654066188B61BC",
    "userId": "52309"
  }
}