BitVault Is Now Live on iOS: Beyond Keys, Protecting Humans
BitVault is now officially live on iOS, combining multisig, hardware-wallet signing and time-delayed Bitcoin transactions with limited launch packages that include hardware-wallet vouchers.
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Coldcard Mk3 and the Limits of Single-Signature Security
The Coldcard incident shows how weak key generation can defeat an air-gapped wallet. We examine what multisig and time-delayed BitVault security mitigate — and what they do not.
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Package Relay and Ephemeral Anchors: How Bitcoin Transactions Adapt to a Changing Fee Market
By Riccardo How a low-fee parent and a fee-paying child can travel through the network together TL;DRPackage relay lets Bitcoin nodes evaluate a low-fee parent and a fee-paying child together. P2A gives the child a compact, keyless output to spend, while ephemeral dust permits that anchor to carry zero value when it is created and…
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secp256k1: The Mechanism That Secures Bitcoin Signatures
How do you prove control of a UTXO without revealing the secret that protects it? By mordom It is one of the most fascinating questions of the entire Bitcoin protocol. Every time you send a transaction, thousands of nodes must verify that you truly have the right to spend those UTXOs. Yet, no one knows your…
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Building BitVault in the Open: Reflections from Summer of Vaults 2026
Over the past two months, the BitVault team has spent more time on trains, planes, conference stages, and event halls than behind our desks. From Bitcare Forum in Brescia to Bitcoin Ireland in Dublin, from BTC Prague to Swiss Bitcoin Conference, and even through smaller but highly valuable gatherings such as BCC8333, this year’s Summer…
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Coin Selection: The Invisible Decision Every Wallet Makes When You Spend Bitcoin
How your wallet builds your financial history every time you spend bitcoin By mordom Introduction You want to send 0.01 BTC.You open your wallet, enter the recipient’s address, check the fee, and press Send.At that point, you might think the wallet simply deducted 0.01 BTC from your balance.In reality, that’s not what happened. Before the transaction…
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SHA-256 and RIPEMD-160: the Role of Hashing in the Bitcoin Protocol
By mordom A Bitcoin address is not a public key. For most users, an address looks like a random string. Something you copy, paste, and use to receive funds. But behind those characters lies a very precise chain of cryptographic transformations. Nothing is arbitrary. Each step exists for a specific reason: security, compactness, resilience, and long-term…
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BitVault joins XFounders Accelerator to advance Bitcoin-native security architecture
BitVault has joined the X-Founders accelerator to continue building Bitcoin-native security systems designed for real-world risk, irreversible transactions, and stronger self-custody. For us, this is a meaningful step: a focused environment where we can keep refining our product, testing our assumptions, and working alongside founders and operators who understand the seriousness of building security for…
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From a zpub to your private key: the hidden risk most people miss
By mordom Imagine a normal situation. You have a hardware wallet. You want to monitor activity without plugging it in every time. Or you need to share addresses with your accountant. Or you’re using a watch-only app.So you export a zpub (an extended public key) and share it. The assumption is simple: “I’m only sharing public…
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BitVault summer of Vaults 2026
Where to meet BitVault next 🌍 Bitcoin lives in code, but it grows through people.In the coming weeks, we’ll be out there meeting the community, speaking on stage, and having real conversations about security, self-custody, and what actually happens when things go wrong. If you’re attending any of these events, come find us. We’d genuinely…
