{
  "manageEntity": {
    "action": "Save",
    "entityId": "997861",
    "entityType": "Track",
    "nonce": "0x4c30b002b9db1ad330cc59124ff44674ffcdf8aa79f21ba508fe446554906c19",
    "signature": "0x5b511708ed03ab548fe2ab6da71c522b4bb70a7ab7d46c6ed3e456990cac8c290e6a3b84e376f01d3b0e4a60d0f0dd3e3fd5e8b2e78d76e1a7e03ad96a7dded11c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}