{
  "manageEntity": {
    "action": "Save",
    "entityId": "1855878149",
    "entityType": "Track",
    "nonce": "0xf0f708017d9f1905ffdcc016b078e2622e8f9262f048876f1a9a549e9eadfac5",
    "signature": "0xb1139b9c26c570082592e74b9a053d22c2351db9b9fa8f0d84bc7cadc420c2641fcd723bfcbdfc12c1ac3ab896839070d7495ce79daa75e87877043b20fb8bb21b",
    "signer": "0xF886D10824DDa867eb89ACd60EAF44D01F1B0E8f",
    "userId": "381084983"
  }
}