{
  "manageEntity": {
    "action": "Save",
    "entityId": "321091550",
    "entityType": "Track",
    "nonce": "0x45fb1d8fb646e647092a007abf4a6ee057a475b440468d6dfdd6b2f3a81fcc62",
    "signature": "0xa828c13bb733a9932129ccb21a9114575747a65a53b5404e1a7d40bc55e0446120ae0f02783bc9fcbddf00081fca0a772e1d0210c28b5b643804cce7ea263f901b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}