{
  "manageEntity": {
    "action": "Save",
    "entityId": "65817666",
    "entityType": "Track",
    "nonce": "0x1e400e2c15d1529077140302ba2b89510cf8a49237a7773a679d85e0b8741ea0",
    "signature": "0xb41a6191254879c94b307914fcbe59d7b0b448c2e57bd1ef68de38a533ef03b60a79630a7aaec56d6921b27844f361f49fd2a9ea72cf00f4e1a1208d626dd00b1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}