{
  "manageEntity": {
    "action": "Save",
    "entityId": "193770",
    "entityType": "Track",
    "nonce": "0x943b03dbb1d99564c1eced67aee812cb875d578c887280ff8bb93d72533f3b4c",
    "signature": "0xcf5fee46c54665d977e8896ce528ad6ed08fb7269595a99d779a103c9064735625e78c02b93f59bdae61d86bd846ed74a8aad65a5e04faf23aebe8e031c99fe51b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}