{
  "manageEntity": {
    "action": "Create",
    "entityId": "507589010",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"entity_type\":\"Track\",\"user_id\":120501,\"entity_id\":1991039548,\"body\":\"👍\",\"comment_id\":507589010,\"track_timestamp_s\":15,\"mentions\":[]}}",
    "nonce": "0x64c7a9a526a4144a40ef731ecdc0719697c73f7fa3661a5e3b68bbb7486752da",
    "signature": "0xe32ca631a3e7d61c4069477a7a607cba37787223b4d408744bf19c87be4e65df470bbaedf9ef730fd971cd9d658d0ba9c2612242c7684a5e0c04f9f88d051fdd1c",
    "signer": "0x38bB298DBEbdb95aDB71E0b6d265CFBd2341DccD",
    "userId": "120501"
  }
}