{
  "manageEntity": {
    "action": "Save",
    "entityId": "66621700",
    "entityType": "Track",
    "nonce": "0x2e9e141d55f09d005cba654c067b2d9d278f2dc6318c5b2aef97b03b8c398cdc",
    "signature": "0xc19cf6c36fd04470169e2d25d93e19674d8d3e887cbdc2a73655f1b5d42f6c40098d53d9bcbb120dbaeeb5e56450e905120e65ff06ba261e627bacfb32865aec1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}