{
  "manageEntity": {
    "action": "Create",
    "entityId": "1251932323",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"entity_type\":\"Track\",\"user_id\":52309,\"entity_id\":1922135946,\"body\":\"nice one\",\"track_timestamp_s\":99}}",
    "nonce": "0x68c65e7d5b0bb47f9d79ec3cbf0510eb767e59dcd14b9390f64fb0a726868853",
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    "signer": "0x1CE93c43F8574f553E8071e946654066188B61BC",
    "userId": "52309"
  }
}