{
  "manageEntity": {
    "action": "Save",
    "entityId": "20811665",
    "entityType": "Track",
    "nonce": "0x55e4403ca4eb980b3e31fdafb8323853430a3add9cfb7cd646becbaef0c75481",
    "signature": "0x9292090bfa9678b1c7388024f70d18f44a1f51bdcaed27149b2bf2c00d448465012fd39a23762a7f34bb1748ff1377fed4344ff937b7fe9bdfde2e2681b1dd511c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}