{
  "manageEntity": {
    "action": "Save",
    "entityId": "1405645020",
    "entityType": "Track",
    "nonce": "0x0dff58f4d5ae27684c8e611e843aa98fda87bf11e6879c632def104d9d908303",
    "signature": "0xa5c96f9eeb91e635bccfd799db371369bcb3a93f2ea8bd5f8cdba272fb9c7bac70927f1fd6ee19f048dc5f0677d4208c0ca12dc73f1f650c3fcdb40b5616a91a1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}