{
  "manageEntity": {
    "action": "Save",
    "entityId": "915462503",
    "entityType": "Track",
    "nonce": "0x0ff4c835b048dd6e52d5d4172087f67357c45551c702e21888377933519a0389",
    "signature": "0x6ba0fef0a115076e0eeaea39d1d0e60ad514d1356fa6ca507418ddea41c746040280803db6697fe760c18823243ca05ed520866ab21779d0d3f43e8bd7e66acf1b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}