{
  "manageEntity": {
    "action": "Create",
    "entityId": "1628066688",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"entity_type\":\"Track\",\"user_id\":20,\"entity_id\":125725495,\"body\":\"oooh!\",\"comment_id\":1628066688,\"track_timestamp_s\":88,\"mentions\":[]}}",
    "nonce": "0x0ca7a2a222127b297b2cd94323b3c86f0e4817de4c7beab362297f4652416315",
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    "signer": "0x040629E31a68119093b9a0111257C8449c2f8e10",
    "userId": "20"
  }
}