{
  "manageEntity": {
    "action": "Create",
    "entityId": "1488666647",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"entity_type\":\"Track\",\"user_id\":52309,\"entity_id\":623194730,\"body\":\"nice!\",\"track_timestamp_s\":110}}",
    "nonce": "0x11ba0aaa2a0c33445aa7f6761d2826c12aa06a63aae9cd448cac2550b633398a",
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    "signer": "0x1CE93c43F8574f553E8071e946654066188B61BC",
    "userId": "52309"
  }
}