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Spot a made-up AI answer in 5 minutes: a numbered checklist covering sources, numbers, dates and cross-checks, plus what to do when you find a mistake.

Arena, the public AI model leaderboard, raised $200m at a $3.1bn valuation and says it has passed $100m annualised revenue, up from $30m in January.

CoinDesk reports that MARA moved about 996 BTC ($81.13m) to an address labelled Galaxy Digital. Nobody has confirmed a sale, and MARA has not commented. What the transfer does and does not show.

Sabi has announced a $50 million seed round led by Khosla Ventures for a baseball cap that reads brain signals. What is confirmed (the raise), what is reported (the $600 million valuation), what are the company's own claims, and why the product is unreleased and unproven.

Underdog's Saluki 27B is a 7.89 GB, 2-bit version of Qwen3.8-27B. Underdog says it passes more tool-calling tasks than the full model on its own 120-task test but scores 15 to 18% lower on competition maths. What quantisation means, and what the numbers do not prove.

The Deno team is joining Cloudflare. Deno Deploy shuts in six months, and the Deno runtime gets one more year of security fixes before development ends.

XRPL's 9 October 2026 disclosure says an integer overflow in its payment engine could be exploited to create XRP from nothing. Fixed in xrpld 3.4.1 on 25 September, no evidence of exploitation. What an overflow and an amendment are, in plain English.

A Stanford and King's College London working paper (not peer reviewed) finds that at AI-adopting firms in 41 countries, senior employment rose 6.7% while junior employment was 2.5% lower, "an estimate that is not statistically significant". Viral posts said junior jobs fell 3%. Here is what the paper says, and its limits.

Luxembourg's Finance Minister announced a planned sovereign benchmark bond "natively based on blockchain technology": at least EUR 1 billion, 10 years, no issue date set. What "native" and "benchmark" mean, and what is only a plan.

MacRumors reports a European Commission filing says Apple can make job offers to certain Huxe staff and take a non-exclusive licence to its IP. Not an acquisition; no names given.