{
  "manageEntity": {
    "action": "Save",
    "entityId": "1671987418",
    "entityType": "Track",
    "nonce": "0xd761813ff85646b429e64f9de5eb616df57427d3463fbd275fa0a18dab250e6a",
    "signature": "0xb59ad12a7809d08993714acc474886dc883b672dd0d2caa13156f0d3664607dc15b035f39dc48d74828622ab42cb36b62a6038afd87bfb63efcee238476a153c1b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}