{
  "manageEntity": {
    "action": "Save",
    "entityId": "521931779",
    "entityType": "Track",
    "nonce": "0x379751679ae388146490dbe236e1a71faca4488ead7216b94a970bd40cc10ba3",
    "signature": "0x961093983fffe50e5991ee5b349e005c9dded84ee995e6c27ef3b2e5c6bb956e64a54f2064b8f9be25ef5db74727a690df4334fecc1a1aaabcacf285fcf39b231c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}