{
  "manageEntity": {
    "action": "Save",
    "entityId": "469881",
    "entityType": "Track",
    "nonce": "0x13d2e435e911e6dbdc3ba584958458cce60bd87e1e60be98b7923f26dd18d570",
    "signature": "0xa88be6bc6f7e079f9f1fff19126f6e09b61b16b23681e36127297e360493fab150d50ed32f2c14aebfc63d2f56f472df59ca5b346ea525b42ff871b2c85fc9071b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}