{
  "manageEntity": {
    "action": "Create",
    "entityId": "215913130",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"entity_type\":\"Track\",\"user_id\":52309,\"entity_id\":939233470,\"body\":\"awesome!\",\"track_timestamp_s\":77}}",
    "nonce": "0xb8a868dffe880ba809600446049c90bb01cc29eb7e28dcc317d9cd214aa1aac4",
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    "signer": "0x1CE93c43F8574f553E8071e946654066188B61BC",
    "userId": "52309"
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}