{
  "manageEntity": {
    "action": "Save",
    "entityId": "255668",
    "entityType": "Track",
    "nonce": "0xb3f020b61b2c9d82e5c041b994b61e3a88e6e27cbccc1c575fa0b5112494a5f9",
    "signature": "0xf30599f40f932c3b37806d7cf4cfc3a9e635149a4aa89d991c87e3ce9266680f7ee998b778e59635e155c6ff0e99b34bb0c6377b2222aca5343a5b2db0cdbfd61c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}