{
  "manageEntity": {
    "action": "Save",
    "entityId": "1603684784",
    "entityType": "Track",
    "nonce": "0x17edb319bf7a8865bd167d13774944498bb9ad4b2f388cb2f433df3bddd4a9a1",
    "signature": "0x8111c13bd3f474c60894bd16287861cc96d345229ad2f766dd3155d04a516e236337f0ea45a3caaa3ce62290091956d8e3017de130fc6824ee00e358c5d79f0f1b",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}