{
  "manageEntity": {
    "action": "Save",
    "entityId": "397817439",
    "entityType": "Track",
    "nonce": "0x3ce632dacb9ff8d4d20b5b70c7d2b90fd77363a1911f2255a3b8bf44bd7e782c",
    "signature": "0x39102be82f042bedc731f91584d6d206bb9d421e417a26e044947c73a80d51e04e5fc43ab72c0f74a0cf1486c21f3142e85ae30b9434854003c5e7c3670187371c",
    "signer": "0x2B2E9550F4B942405D45c3F93C3D91Bc20DdfC5e",
    "userId": "644941151"
  }
}