Max Hillebrand – Privacy as a Shield: Strengthening Security Through Bitcoin and Self-Custody

Privacy is one of the most overlooked pillars of Bitcoin security — and of personal safety in general. At the BTC Prague stage, I walked through what I believe every Bitcoiner needs to understand: that privacy isn’t about secrecy, it’s about protection. Here’s what I shared.

Privacy Is Security, Not Secrecy

When people hear “privacy,” they often think of hiding something shameful. But that’s completely wrong. As the cypherpunk manifesto beautifully puts it, privacy is the power to selectively reveal yourself to the world. If an adversary knows where you are, who you are, how much you have, and whom you talk to — it becomes very cheap for them to come and harm you. Privacy increases the cost of attack and decreases the cost of defense. That’s not ideology, that’s game theory.

When Digital Privacy Fails, Physical Danger Follows

This isn’t abstract. There was a recent case of a woman who accidentally revealed her Coinbase balance during a livestream. The next day, armed attackers showed up at her door. Fortunately she was able to defend herself — but not everyone will be. Revealing too much about your holdings can have life-threatening consequences for you and your loved ones. This is why I take this so seriously.

Self-Custody Is Non-Negotiable

Trusting a third party with your Bitcoin means trusting them with your privacy and your security simultaneously. They can get hacked, they can run away with your funds, and they know exactly how much you hold and where it goes — making you a target. Self-custody removes that risk entirely. It’s the core innovation of Bitcoin: holding base money in cyberspace without any trusted intermediary.

Three Rules to Keep Your Bitcoin Safe

First, use a hardware wallet — a dedicated device designed from the ground up to protect your private keys. Options like the Coldcard, Foundation Passport, and Blockstream Jade Q all support airgapped operation via QR codes, so your signing device never touches an internet-connected machine. Trezor, sponsor of this event, invented the category and continues to innovate. Second, consider multi-signature setups. Requiring two or three devices to authorize a transaction means a single compromised device doesn’t cost you everything — the same four-eyes principle banks have used for decades, now available to everyone. Third, maintain secure physical backups. Electronic devices fail. Paper burns. Steel doesn’t. The Seed Hammer — first introduced at BTC Prague two years ago and now in its second edition — automatically engraves your seed words or QR codes into steel in under 30 seconds. It even supports Shamir Secret Sharing, so you can split your backup across multiple plates and require, say, three of five to reconstruct your wallet.

Your Biggest Enemy Might Be Yourself

The most common way people lose Bitcoin isn’t hackers or wrench attacks — it’s forgetting passwords and losing seed phrases. We’re notoriously bad at generating randomness and remembering it. This is where password managers like KeePass or self-hosted Bitwarden come in. One critical rule: never store your 12 words and your passphrase in the same location, physical or digital. They should remain separate at all times.

Your Operating System Matters More Than You Think

If you’re running Windows, I have bad news. Screenshots of everything you see are being taken, categorized with AI, and likely logged on Microsoft servers. The trend is only getting worse. Switch to Linux, and for mobile, GrapheneOS is the most secure option available. Pair that with a Start9 home server — a plug-and-play device that runs your Bitcoin full node, and services like Nextcloud to replace Google Drive — and you’ve taken your digital sovereignty seriously.

A Step-by-Step Path With Sound Money Solutions

At my company, Sound Money Solutions, we’ve built ten