{
  "manageEntity": {
    "action": "Create",
    "entityId": "504517863",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"entity_type\":\"Track\",\"user_id\":10209,\"entity_id\":212896575,\"body\":\"Sick!\",\"comment_id\":504517863,\"track_timestamp_s\":138,\"mentions\":[]}}",
    "nonce": "0x73e1c15259cf89273d180df9c4978efbea0b29713bd446c3442cf7b5414c83ee",
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    "signer": "0x7F0D837d65C527D885076B2feB23Eb406A62F893",
    "userId": "10209"
  }
}