{
  "manageEntity": {
    "action": "Create",
    "entityId": "325602121",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"entity_type\":\"Track\",\"body\":\"hello\",\"entity_id\":211928851,\"track_timestamp_s\":5}}",
    "nonce": "0x3c042ddae4ff17d4815aa4cd2a5fde7adba08fdf2b865afd920b95cea9e8e3f6",
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    "signer": "0xF3f2A660938e89f083B5A0DBf0d6bb9Ba161b727",
    "userId": "633325839"
  }
}