{
  "manageEntity": {
    "action": "Save",
    "entityId": "588926113",
    "entityType": "Track",
    "nonce": "0x977e8897baf16388ef80fcd5126baff25ea5250753e403494a1a7545ac4255c3",
    "signature": "0x4548bcfe48245d172ffe936f4485edf5e78cd7026d1a75b6d38e11dc1720fec25f90853cb6bcd046ba8a1860ee2e5ac61e687799a41b587e9e3d1c77218bdd6b1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}