CPUs Are Back: The Datacenter CPU Landscape in 2026

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• RT Sean Bowe: Zcash's new formal verification efforts eliminate undetectable counterfeiting bugs from the new Ironwood pool.

  6.0

  Zcash's formal verification efforts have eliminated undetectable counterfeiting bugs from the new Ironwood pool, ruling out such vulnerabilities up to the underlying cryptographic assumptions, as part of Project Tachyon.

• RT Dev 🧪: Zcash testnet is updating for Ironwood tomorrow! We have two independently developed consensus implementations of it. One by @valargroup,...

  3.5

  Zcash testnet is updating for Ironwood with two independently developed consensus implementations, one by Valar Group (in audit) and another by the Zcash Foundation. Users can try a desktop wallet fork with migration code, and Keystone dev device users can update firmware to test signing 11+ transactions with a single QR code.

• The other kind of control flow guard check: The combined validate and call

  0.5

  Raymond Chen explains a specific type of Control Flow Guard (CFG) check that combines validation and function calling into a single operation, describing how this "combined validate and call" approach works as a two-in-one package within Windows security mechanisms.

• June 2026 newsletter

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  Simon Willison's June 2026 sponsors-only newsletter is now available, covering topics such as Claude Fable 5, GPT-5.6, US export restrictions, GLM-5.2, Datasette Apps, and various model releases. The newsletter is accessible to GitHub sponsors, with a $10/month sponsorship option to stay a month ahead of the free copy.