{
  "manageEntity": {
    "action": "Create",
    "entityId": "456320307",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"entity_type\":\"Track\",\"user_id\":20,\"entity_id\":1743198643,\"body\":\"oooof!\",\"track_timestamp_s\":57}}",
    "nonce": "0x455bd8389d9ef635260b4ab492fdde29a2595ef1af2663a5430a77d50be06275",
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    "signer": "0x1CE93c43F8574f553E8071e946654066188B61BC",
    "userId": "20"
  }
}