{
  "manageEntity": {
    "action": "Save",
    "entityId": "1645754764",
    "entityType": "Track",
    "nonce": "0xefc21eae3cea1ce8a733e83af36fd72643783c3c3648f62d023c035d198a680c",
    "signature": "0xc9ca376faa2d71e550dacd6a956b2151d6f210d084a5be25803f33fd5c5740e655ad74e4201514b8335db44c96b455208544b56d39892b330647405fe6615dbb1c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}