On Tuesday, Bitcoin nudged lower around the $81k line, the tape as grindy as ever. Away from the price action, the quantum-computing front saw fresh movement — the latest turn in a story we have followed about the quantum threat to Bitcoin’s signatures. On October 16, nine blockchain companies announced the formation of the Quantum Alliance, a body meant to set a set of quantum-safety testing standards for blockchains, wallets, and infrastructure. ...

One man, one playbook, two exits. On October 2, the Ethereum Layer 2 network Blast posted a short announcement: operating costs exceeded revenue, so it would shut down [1]. Ten days later, the NFT marketplace Blur announced it would take its site offline on November 12 [2]. Both projects came from the same person — Pacman, whose legal name is Tieshun Roquerre. At its peak, Blur’s monthly trading volume reached $1.43 billion. DefiLlama puts the protocol’s cumulative revenue at $2.26. ...

A reader recently asked a sharp question: how should we think about combining AI with blockchain? Beyond financial speculation, what is a blockchain with a token actually good for? If its only real use is finance, how does that sector ever grow large? And how is an ordinary person supposed to take part? I have long believed that AI and blockchain are fated to strike sparks off each other, and that at some point in the future the two technologies will show a strong, mutual relationship of dependence, connection, and complementarity. ...

Every few months the same panic returns. This time it was reignited by an interview clip in which Justin Sun argued that quantum computing and AI breakthroughs are reasons to be bearish on Bitcoin. Social feeds lit up with “quantum panic” all over again. Some were terrified, convinced the countdown to cracking Bitcoin’s private keys had already begun, with talk of it happening within one to one and a half years. On Monday, however, Bitcoin was just grinding along above $80,000 — calm, with no sign of the panic the narrative promised. ...

If you run any kind of automated trading — a simple rebalancing script, a grid bot, or a full strategy engine — you cannot avoid the exchange API key. It is the credential that lets your code move money. Functionally, it belongs to the same family as a database password or a cloud account key, and it deserves the same discipline: grant the minimum permission necessary, and nothing more. This guide translates the common-sense engineering practices around API keys into the specific context of crypto exchanges, and expands on the basics with the details that actually get skipped — rotation, multi-key segmentation, and what real-world breaches look like when these controls are missing. It contains no real keys and no platform-specific click-through instructions; for the latter, defer to your exchange’s own documentation. ...

On Wednesday Bitcoin hovered in a narrow 83k–84k range, the kind of quiet consolidation that gives the tape-watchers little to talk about. Off the chart, a livelier contest was playing out between two economists over whether Bitcoin’s fixed supply is a bug or a feature. The spark was economist Lawrence H. White’s 2023 book Better Money: Gold, Fiat, or Bitcoin?, one chapter of which argues that Bitcoin’s fixed supply makes it too volatile to serve as a medium of exchange. Saifedean Ammous, author of The Bitcoin Standard, recently published a point-by-point rebuttal. [1] ...

On Tuesday, Bitcoin slid from its 30-day line at $82.8k, dipped to retest the 50-day line at $81.1k, then bounced back to hover near the 30-day line. Off stage, though, a report from an international regulatory body pushed a stablecoin market now worth over $300 billion back into the spotlight on safety. On October 12, the Financial Stability Board (FSB) published a report warning that stablecoins could face a redemption crisis under market stress. What makes the warning special is precisely that it targets the well-reserved ones: even with full reserves, a run is not guaranteed survivable.[1] ...

The 2026 Nobel Prize in Physiology or Medicine went to three names: Karl Deisseroth, Peter Hegemann, and Georg Nagel. The official citation reads: “for the discovery of light-gated ion channels and optogenetics."[1] The award, which sounds a little abstract at first, tells a rather romantic story: humanity spent decades, and finally learned to use a beam of light to switch on or off a specific group of nerve cells in the brain, with precision. ...

Last Friday (Oct 9), BTC quietly retested its 50-day line (around $80.7k), then, after a two-day weekend, climbed back to $83k–$84k. But what sent a chill down the market’s spine was not the price action. It was a supply-chain attack on Ledger hardware wallets that, by some accounts, drained close to $100 million. A Ledger unit shipped from Malaysia, when opened, was found to contain a tiny board where the screen’s padding should have been — a board that had no business being there. On a fingernail-sized piece of silicon sat a full mobile-communications stack: an LTE module, an antenna, an eSIM, plus a microcontroller wired into the device’s SPI bus. It cannot crack your password, but it quietly watches the screen, memorizes the 24 words you jot down during setup, and beams them out[1]. ...

The recent supply-chain compromise of Ledger devices (analyzed in a companion piece) has left a lot of people nervous — suddenly doubting the hardware wallet they trusted. That reaction is understandable. But it does not mean a hardware wallet is a false proposition. To see why, we have to separate the product from the idea. A product, and a commodity A hardware wallet from Ledger, OneKey, or any other vendor is, first, a product — something designed and built to meet a need — and second, a commodity — something that enters the market to be exchanged and sold. The two words describe the same object from different angles: “product” emphasizes function, “commodity” emphasizes the transaction. ...