Bitcoin xpub Exposure: One Leaked Key, Whole Wallet at Risk
A leaked Bitcoin extended public key exposes every address in your wallet tree, past and future. The mechanism, the math, and the containment steps.
№ 002SecurityBitcoin Script Stack Evaluation: Order Creates Bugs
Bitcoin Script's stack-based execution order produces subtle, costly bugs in complex spending conditions, mechanics and a worked example examined.
№ 003SecurityMerkle Mountain Ranges: Proof of Inclusion Explained
MMRs let blockchains prove data inclusion against a growing history without invalidating old proofs. The mechanic, the math, and the tradeoffs.
№ 004SecurityBitcoin Peer Discovery and Eclipse Attacks Explained
Bitcoin's peer discovery resists eclipse attacks via randomized bucketing, anchor peers, and subnet limits, but the gaps are real and worth knowing.
№ 005SecurityReplay Attacks vs Double-Spends on Forked Chains
Replay attacks and double-spends differ mechanically, defensively, and in attacker effort. The distinction shapes real security decisions on forked chains.
№ 006SecurityFrance Sets 2027 Deadline for Quantum-Safe Encryption
France will stop certifying products without quantum-safe encryption in 2027, just as Bitcoin developers weigh their own post-quantum timeline.
№ 007SecurityPedersen Commitments and Confidential Transactions Explained
Pedersen commitments hide transaction amounts while letting anyone verify no coins were created from nothing. The exact mechanism, step by step.
№ 008SecurityCoinbase Quantum Risk Report Flags Bitcoin Cold Wallets
Coinbase's quantum risk report puts exchange cold wallets among the bitcoin exposed by address reuse. What the warning means and what to watch.
№ 009SecurityBug vs Attack Chain Reorganizations: Key Differences
Chain reorgs look identical on the surface. Here's how engineers and analysts tell a bug apart from a deliberate attack, and why it matters.
№ 010SecuritySybil Attacks on Nakamoto Consensus: The Real Cost
Why flooding a proof-of-work network with fake identities doesn't work: the economic mechanics that make Sybil attacks prohibitively expensive.