{
  "manageEntity": {
    "action": "Save",
    "entityId": "1850039858",
    "entityType": "Track",
    "nonce": "1789978271023879319",
    "signature": "0x9f7d3aa7421ec8b419a47158ce13f8a117be4dce6123c104e4c3d77e205549da5b46483583bcdb38a0cc370621ce18679cc115fea02471859696a2d781a201581c",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}