{
  "manageEntity": {
    "action": "Save",
    "entityId": "401394653",
    "entityType": "Track",
    "nonce": "0x7dc49c45140ea929d7707574d3e94a5f563fb5ae04c2b7ce3383f8df614770d6",
    "signature": "0x2e8a7980e3edc5470913a4ec8fed0c58405ebdf2c393d5c8c0c254a8dc3e787a69d21bc576e13417246f20d4c59c083ab783bc7f05e121f8d9cd67338623a94b1c",
    "signer": "0xA66d5981794A5e084FBD9adBFF28F465924fb9a9",
    "userId": "980224167"
  }
}