{
  "manageEntity": {
    "action": "Save",
    "entityId": "1781356835",
    "entityType": "Track",
    "nonce": "0x5edfe8f6ee3abb3f89fc6523dd53895d8707d79ca548642c04326f9fac2fdd4a",
    "signature": "0x7162448bb7ac6df413fab1f251a713428ca28cf4880890376f8b2931ea7ac5ca0863c183ba37e1ed7e70cdc2d88b85aa2c63055ba7c9f798c35f6c16800253e01c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}