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The Off Switch Is a Gas Parameter: Arbitrum Paused New Stylus Activations Without Shipping Code
Arbitrum's Security Council turned off new Stylus activations on 2 October 2026 by raising one configuration value to the 64-bit maximum. A decision postmortem of the two switches, the availability ledger, and the two clocks the mechanism runs on.- 25
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The Quantum Threat to Crypto: What the EU Warning, Exposed Keys, and Q-Day Timelines Actually Mean
EU supervisors flagged quantum risk to blockchains, and about 30% of Bitcoin supply has public keys already exposed. What the numbers mean — and why migration is a governance problem.- 3
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What Is a Blockchain? It Is a Chain of Hashes, Not a Chain of Blocks.
A blockchain is an append-only log in which each block records the hash of the block before it. That single link is what makes an edit detectable and expensive, and it settles nothing on its own: who may append the next block is decided by consensus rules, not by the chain of hashes. -
Bitcoin Is Four Things: What the Word Means, and How a Coin Gets Made
Satoshi’s own 2008 email said new coins are made from Hashcash style proof-of-work. The 21 million and the ten minutes both follow from that one sentence. Here is the whole machine, with numbers you can check yourself.- 16
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The Key Never Left the Box. That Was Never a Guarantee.
A study forged RSA signatures on a key that never left its hardware security module. The key was not the problem. The interface that answered four billion questions was.- 14
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Q-Day Field Notes: Bitcoin’s Quantum Bill Dropped 79% in a Week
An open contest run by StarkWare, Yukon Research and Eigen Labs cut the estimated cost of building a quantum-safe Bitcoin transaction from about 320 dollars to 67 in a week. That benchmark matters more than any Q-Day forecast - three notes on it, and two things people get wrong.- 22
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