{
  "manageEntity": {
    "action": "Save",
    "entityId": "520774",
    "entityType": "Track",
    "nonce": "0xb00128e0df3dda8bbfb1734c73b5b89817bd126aed134390bc3f79a385bbc27b",
    "signature": "0xa8a563815b32494c8a30e9fe75c19a181174d9465f99dcbdefe169a5e85f710d63fe143d0986c4bcc27f03dd489aef86a8a99ab1920761f0ef581e11c6abad771b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}