{
  "manageEntity": {
    "action": "Save",
    "entityId": "1516604827",
    "entityType": "Track",
    "nonce": "0xb62d355511136b3fba3e4d8bec3ac872567e0e00241939fad888907db53b5ba3",
    "signature": "0x7c9f7e9bcacf34b0ea1fc482849f5cc08ff984527157c491ed341484e8607d5966c622015f2fc7c99c92ba3139185d32464bd3c75c55ac58513647e859ab90c41c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}