{
  "manageEntity": {
    "action": "Save",
    "entityId": "490159049",
    "entityType": "Track",
    "nonce": "0xb9ee1508990088e565ec0d0e9b4b42849d98b9cce3d34f5bf4ad2b51f92b188f",
    "signature": "0x341b808621aeae3a8e98407488ae534e628cbc3700b51aa6737080f0d823d6566974a42018862aaddc76dd39d0a39800ea7f3d4676e4a81185b5686d39a9a5211c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}