{
  "manageEntity": {
    "action": "Save",
    "entityId": "504510",
    "entityType": "Track",
    "nonce": "0x86dc681986e40deafab6751017a2ca281adfde105b5d7b3682873c68abb14dc9",
    "signature": "0x058c762f719b10095ffb270a8ebbe25b905328ff568e64c9a2ef43da6fcb65080e01c9b6c5b55496746beb9a77661b6e7e8adf3bc6a35724c02bc2bc257e1b7e1b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}