{
  "manageEntity": {
    "action": "Save",
    "entityId": "569989",
    "entityType": "Track",
    "nonce": "0x9bd0c258f8d17f078ae42f30fcb9cc5b78e3767dd885f6352d76ce478fc1c2e1",
    "signature": "0x31de8a4b92fd93b07901d557aa0c8bb517943653e0b48835cafafde61594cb07071cb924036f109b9e3cb893b66aa34815ecd5ae5c6846a8bc66305f939529d61c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}