FXProof is a B2B SaaS for creating signed, verifiable proof documents for official exchange rates. Each reusable proof bundle preserves the selected official source, rate date, dataset details, document ID, payload hash, signature status, and public verification data. It helps accounting and finance teams, bookkeeping and tax practices, auditors, compliance teams, small businesses, freelancers, and software providers document the exchange rate used for invoices, expenses, accounting entries, tax files, internal controls, audits, and dispute reviews. Supported sources include the European Central Bank, HMRC, the Federal Reserve, the Bank of Canada, and the National Bank of Kazakhstan. Users can view proof samples, verify an existing document without an account, retrieve ready proof bundles in the web application, and automate the same workflow through the API. FXProof is not a currency exchange, trading platform, or provider of investment, legal, accounting, or tax advice.