{
  "manageEntity": {
    "action": "Create",
    "entityId": "399733844",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"entity_type\":\"Track\",\"body\":\"nice\",\"entity_id\":2125369206,\"track_timestamp_s\":128}}",
    "nonce": "0x8a78b4f913942005afbcbc4a7cc59f709607e645b78b505e318c1f9710b7a133",
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    "signer": "0x36d29AA5C780341f3b35bDE6c1411a7Abcf8794C",
    "userId": "571117272"
  }
}