{
  "manageEntity": {
    "action": "Save",
    "entityId": "981945492",
    "entityType": "Track",
    "nonce": "0xb4a2c2cc858c43ca4394ae91fdcc665ba994c64f451e799359559c4e73e2d7c8",
    "signature": "0xda088e02897cdf81a07239e9e5f373b72336b2bc47e67c435d317c232a9410eb66ee80f3bfb49de5f1af3ab9b485ab19ea6eeed0bc2c6eb77ecb15df53a8302b1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}