{
  "manageEntity": {
    "action": "Save",
    "entityId": "615442517",
    "entityType": "Track",
    "nonce": "0xa4d7cd91e2909afb610bece4ced0ab3e1c37afea043e075261ce19814c99ab5a",
    "signature": "0x54ba9600ab4e161a255a2a41658c5d6c8ec2be82d1794bdbfcfa6c6d96139d3e09a7243395cc9dc95a561306f307c7cea0d732a77fce07dd471717863e14b9d81c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}