About BitcoinProof
Self-custody is the point of Bitcoin — you hold your own keys, answerable to no institution. But when a tax authority, an auditor, or a bank asks you to prove what you held on a given date, that same independence leaves you with nothing official to hand over. BitcoinProof exists to close that gap.
Why it exists
A bank can issue a statement. A broker can issue a holding report. A self-custody Bitcoin holder has no one to ask — the network doesn't know who you are, and there is no institution standing behind your wallet to certify a balance.
Yet the obligations keep arriving. Dutch Box 3 wealth-tax at 1 January. Swiss cantonal wealth-tax and Norwegian and Spanish equivalents at 31 December. Australian self-managed super funds valuing every asset at 30 June for an independent audit. Mortgage applications, estate administration, proof-of-funds requests. In each case someone needs objective evidence of what a wallet controlled at a specific moment — and a blockchain-explorer screenshot isn't evidence an auditor can rely on.
BitcoinProof reconstructs what an entity controlled at any historical date, directly from the wallet's own descriptors, and produces a reproducible, independently verifiable PDF report. Anyone who receives it can check the work against the public blockchain themselves. That is the whole product: turning self-custody holdings into documentation someone else can trust — without asking you to give up custody or privacy to get it.
What we build — and what we don't
BitcoinProof is deliberately narrow. It does one job well rather than many jobs adequately, and the boundaries are a product decision, not a roadmap gap.
What it is
- Bitcoin-only. One asset, understood deeply.
- Local-first. It runs on your machine; you can point it at your own node.
- Privacy-preserving. No accounts inside the app, no analytics, no tracking of what you hold.
- Verification-first. Every figure in a report can be re-derived from public data.
What it isn't
- Not a wallet. It never touches your keys or moves funds.
- Not tax software. It documents holdings; it doesn't compute your liability or file anything.
- Not a portfolio tracker. No dashboards, no price alerts, no "manage your crypto."
- Not custodial. Nothing leaves your machine except the block data you choose to fetch.
The people behind it
BitcoinProof is a small, independent team — two people who between them have spent years in Bitcoin self-custody, one building the product and one building the relationships that connect it to the people who need it.
Wenze van Klink
Founder — Product & Engineering
Wenze designed and built BitcoinProof: the reconstruction engine, the report format, and the verification methodology behind it. His focus is correctness — a verification product only earns its name if every number in a report holds up when a skeptical auditor checks it against the chain. He works in the open with the self-custody community whose standards the product is built to meet.
The Bitcoin Adviser ↗ · wenze@bitcoinproof.io
Disclosure: Wenze van Klink, founder of BitcoinProof, is also a consultant at The Bitcoin Adviser. If you engage him as your adviser there, he is paid a commission for that work. Neither business pays the other for referrals — BitcoinProof and The Bitcoin Adviser are independent businesses.
Jock Jensen
Growth & Partnerships
Jock focuses on relationships — connecting BitcoinProof with the self-custody community and the accountants and advisers they rely on. Close to a decade in Bitcoin, and recently building Rumbla — his own self-custody and Bitcoin education platform — means he understands both sides of the conversation, and builds the trust needed to bridge them.
How we work
We're honest about our scale. BitcoinProof is a focused, independent product, not a large company — and for a tool you're trusting with evidence you'll put in front of a tax authority, that transparency matters more than the appearance of size.
- Correctness before features. A wrong figure in a verification product isn't a bug to patch later — it's a failure of the one promise the product makes. That's why the method is public and every report is independently checkable.
- Your data stays yours. The app is local-first and privacy-preserving by design. We don't track what you hold, and we've built the product so we don't have to.
- We say what a report is — and isn't. BitcoinProof produces objective evidence of on-chain holdings. It is not financial, tax, legal, or accounting advice. The Methodology and custody guide set out exactly what the evidence supports and where a professional should still be in the room.