{
  "manageEntity": {
    "action": "Save",
    "entityId": "1291981147",
    "entityType": "Track",
    "nonce": "0x8f98a1cb522d7b3060698a5ca88bf7357cf9e4a6a91aadfcf0160165ec252c23",
    "signature": "0x99bda018bdd81ae9c2b73afdb94c47abfd5436c0b0fb53508dda9393e3839d281ee8b0eb9188e94d6d2d25460253c1b95f254843937016a9476f36493bcd32af1c",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}