{
  "manageEntity": {
    "action": "Save",
    "entityId": "1777710568",
    "entityType": "Track",
    "nonce": "0x38b8b158c2621d100abe14295c0a1e0eae954b3922ce16441e58f17309b41d5d",
    "signature": "0x94b8b525dd2b807e91e29c2fb47c751592decd107c54bafae1dd49bca82696d80c9ef1b5e87e314c4e94f3716bceddbd4c2974af6e568a89fd0231e7066d64f61b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}