{
  "manageEntity": {
    "action": "Save",
    "entityId": "818098440",
    "entityType": "Track",
    "nonce": "0x321852215532afbb9cbb566256803cd744b5b15b7cc02b6e9d023d040d0f727d",
    "signature": "0xe12abc18b24a7e62add8d6da8c83657bf5fc894914fbaa25b033a1513cca1be0704b39ae48ea2e51fafcd6c156c085e947a62dd58ea348c42c209ccc1e4a95e31c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}