A Bitcoin wallet does not really spend from a single “balance.” The balance is a useful abstraction. Under the surface, the wallet chooses which UTXOs to spend. That decision matters more than most users realize. It can change the size of the transaction, the fee paid, the change output created, and the future shape of the wallet. It can also create public links between UTXOs that previously had separate histories. Coin selection is one of those hidden wallet decisions that quietly defines the quality of self-custody. Read the fullarticles here: 👇 https://blog.bitvault.sv/coin-selection-the-invisible-decision-every-wallet-makes-when-you-spend-bitcoin/

One thing stood out during Summer of Vaults 2026: Bitcoiners care deeply about security. From Brescia to Prague, Dublin, Barcelona and Switzerland, we had countless conversations about self-custody, coercion resistance, operational security, inheritance, multisig and real-world threats. Some people loved our ideas. Others challenged them. Both were equally valuable. Open-source Bitcoin is built through discussion, criticism and iteration. Thanks to everyone who stopped by to share their thoughts. We're taking those lessons back into the product. Public Release coming soon. ⚡ Read more: Summer of Vaults 2026 Recap: 👇️ https://blog.bitvault.sv/building-bitvault-in-the-open-reflections-from-summer-of-vaults-2026/

Prague is peak signal. → https://btcprague.com

SHA-256 gets most of the attention because of mining and proof-of-work. RIPEMD-160 is less discussed, but it also plays an important role in Bitcoin address construction. That contrast is useful. Some parts of Bitcoin security are visible and dramatic. Others are quiet and structural. Both matter. This is why good Bitcoin education should avoid two extremes: oversimplifying the protocol into slogans, or making it feel unnecessarily obscure. Hashing is technical, but the core idea is approachable: take data, produce a fixed-size fingerprint, and make it practically impossible to reverse or fake. From that simple idea, Bitcoin builds a lot. We wrote a short article to explain where SHA-256 and RIPEMD-160 fit in the protocol. Check it out: https://blog.bitvault.sv/sha-256-and-ripemd-160-the-role-of-hashing-in-the-bitcoin-protocol/

One of the best things about Bitcoin is that the deeper you look, the less it feels like magic. It becomes a system of small, specific mechanisms doing limited things very well. Hashing is a perfect example. SHA-256 and RIPEMD-160 are not 'advanced features'. They are basic building blocks. But the way Bitcoin uses them matters: proof-of-work, block integrity, transaction identifiers, public-key hashing, address construction. The important lesson is not just what each function does. The important lesson is that Bitcoin security comes from careful composition. Simple tools. Clear rules. Verifiable outcomes. That mindset is also central to how we think about self-custody security at BitVault. Security should not depend on vague trust. It should depend on mechanisms that can be understood, verified, and tested. Check this out to learn more about this topic: 👇 https://blog.bitvault.sv/sha-256-and-ripemd-160-the-role-of-hashing-in-the-bitcoin-protocol/

Some days ago our took the stage at #bcc8333 to talk about our approach to a trustless keys recovery system. Give it a look at www.b-ssl.com. Thanks SatoshiPassion for the awesome pics!