{
  "manageEntity": {
    "action": "Save",
    "entityId": "18475954",
    "entityType": "Track",
    "nonce": "0x9663fb16509771fdc38ac4d911b8ee2a5948159ad9286dbe81e36afe70b45927",
    "signature": "0x815fad24f76f0b20217e2d5d7ab5cb55fb2828cb64874764d3d50af45462a9cb258d5528c502966007d75328739d889591466c0622228d5fe1e65e963b97244f1c",
    "signer": "0xc2866e2a73cc1f91d6F5c62287152F2394D1979D",
    "userId": "216678909"
  }
}