{
  "manageEntity": {
    "action": "Save",
    "entityId": "1742435187",
    "entityType": "Track",
    "nonce": "0x77cf83dde99f698e6d9e62b8097c5d72654070bd48968817a4bd3af1224cb0e8",
    "signature": "0xf6576331d1b4ef6956fcd89809d90bdddd34b1ab305d8181969445b6676d26bc3a76a30fd82b335eb955c98976c14cb27d161a7ceec945997e82e455df935e3e1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}