{
  "manageEntity": {
    "action": "Save",
    "entityId": "1511721644",
    "entityType": "Track",
    "nonce": "0x63b7fb549c1922668e74350ec2f897610b4962b1b0645bc03fb6dd0d0dba8f90",
    "signature": "0xa6b7d0fa242e0d0e1aa244c777de2e5bdebc4a4228703d339a900e0151793b8974941b0942f4649b69a2f375983a40dee09d7efbef578cbb25b975fa56d28b3b1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}