{
  "manageEntity": {
    "action": "Save",
    "entityId": "685242491",
    "entityType": "Track",
    "nonce": "0xd2a439eb6bcc41e6f5433590413962484ce34b24be4e91be6f66be446226ef0f",
    "signature": "0x19c28e319456bac3c179c8c95199956cc366e4a155d258505bf220f51fc874a426b5449de90862afc8853590752252aa1c198f752235c77dd8cd4b64183c8a481c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}