{
  "manageEntity": {
    "action": "Save",
    "entityId": "722153000",
    "entityType": "Track",
    "nonce": "0xec35b8fc36380a0cfa0a33a4918740c15919cfa186cd11d694602aba194cd7e0",
    "signature": "0xc48b2b1a97267c01ad8938d7df3fcfcdbbd5b6f1673eedd9be05bec99a7062762c6f2f5b0c2c468b4bc516ac19df78e84f195db70656c2d43a4d95b3131dea281b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}