> For the complete documentation index, see [llms.txt](https://x-pass.gitbook.io/_whitepaper/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://x-pass.gitbook.io/_whitepaper/oracle-problem.md).

# Oracle Problem

Blockchain is a decentralized storage technology that makes data tampering or alteration difficult, but it faces challenges when bringing external data onto the blockchain, known as the Oracle Problem. To address the authenticity issues between physical and digital assets (ownership) on the X-PASS platform, a physical-to-digital image verification process (NFT Validator) is established, effectively resolving the oracle problem.