{
  "manageEntity": {
    "action": "Create",
    "entityId": "565259840",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"entity_type\":\"Track\",\"user_id\":52309,\"entity_id\":874070477,\"body\":\"nice!\",\"track_timestamp_s\":38}}",
    "nonce": "0xa7a367f8b1c8f99f533890d76fd349ca03abee9e09e614f040dc735cafc788d0",
    "signature": "0xfc2da44a125134fd9bd2f5a053848db7f92ae3a2d13d70d0d7ac91c29b4c46dc0f209f41f57c382bdd1193674b875636c401d1ee88894d0520fcdffe7bc147d01b",
    "signer": "0x1CE93c43F8574f553E8071e946654066188B61BC",
    "userId": "52309"
  }
}