{
  "manageEntity": {
    "action": "Save",
    "entityId": "890292098",
    "entityType": "Track",
    "nonce": "0x0fac57706686e9b6b209c12c3301922aeaa040e1fcb1303538f51683900688b4",
    "signature": "0x9fcf8102ddd9280cb1321a68970e12777909254cae43c1e8b3fb67f83479790f55d41e2c61ef8c3608b4fcdce92d7ee154f62bc8809f27842c7ed41f537549781b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}