{
  "manageEntity": {
    "action": "Save",
    "entityId": "2121999190",
    "entityType": "Track",
    "nonce": "0xf8fe25906d043294eae90366555b1feea96184538fe14cefe246acb4da4ed980",
    "signature": "0x542296b6ed03d880934f9ca37b3195cc9a9e7c08b57e94328f1f3dff7e523128395be8a78a4f720035789b2fddded2372fd57cb404a3ad4661ba92261c84fa7c1b",
    "signer": "0x9668338741f0B2F3bcc87715a755f7FFACcEd1D6",
    "userId": "945181225"
  }
}