{
  "manageEntity": {
    "action": "Save",
    "entityId": "586134280",
    "entityType": "Track",
    "nonce": "0x8f42d69356c2d28f45c4402f898a1505f271dcb1f446fc9da0884291abd2aab5",
    "signature": "0xfa9f8d4e361c5ea781a217f864ff6c8c7d544391fa8553c9620607acd84222f24684a50a9f55b55b62f04dfd14c9895101833f5d7874f75b3d6dc850a4e818811b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}