{
  "manageEntity": {
    "action": "Save",
    "entityId": "1443578414",
    "entityType": "Track",
    "nonce": "0xe977434240e5bed3f3e49a91defe28621fc4a3601487963ed8871d00999d0ba8",
    "signature": "0xcf4b440ffe33d6fc9c8ced19529732159a3efd1cb326c438c9a8b94ab5a37ba321479e762744aab90c5f3dbbd1cca7d5f250c9831330e3274b6570963e4822c71c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}