{
  "manageEntity": {
    "action": "Create",
    "entityId": "1914369159",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"entity_type\":\"Track\",\"user_id\":20,\"entity_id\":1196681918,\"body\":\"fire!\",\"track_timestamp_s\":75}}",
    "nonce": "0x9aa4a46c4f5eef74c7c6eb93c44051c0514ec2f6095b070383adb5dc4019ddd7",
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    "signer": "0x1CE93c43F8574f553E8071e946654066188B61BC",
    "userId": "20"
  }
}