{
  "manageEntity": {
    "action": "Save",
    "entityId": "984847023",
    "entityType": "Track",
    "nonce": "0xe1d10c5a2be0b163963e20e1a04fe574df39b9e503a701a89eaf9fbbad20847a",
    "signature": "0x7c16100d2364be2a43283cf979b28d3c0cd233fc6ce16a00659bdbe39370c0ea3d829a2057cce206a0d1e07e8298b9b922349808e6d9c48ca2a3b2ceb673ef3e1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}