BitcoinCrypto

Bitcoin Optech Newsletter #431

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 13/11/2026, 13:07:24 UTC.

Briefings

Bitcoin Optech Newsletter #431 (Nov 13, 2026) reports three Bitcoin Core vulnerabilities affecting older releases, a plan to mine testnet5 genesis block starting Nov 13, 2026, and an investigation into compact block reconstruction failures. The newsletter also details a draft BIP for exfiltration-resistant signing and announces new releases and release candidates.

Key points

• Three Bitcoin Core vulnerabilities were disclosed in September 2025: a high-severity bug preventing block template creation during reorgs in versions 28.0-29.1, and two medium-severity bugs regarding Tor connection permissions and compact block processing stalls.
• A plan was announced to mine the testnet5 genesis block starting November 13, 2026, once mainnet reaches block 975,744, requiring ASICs and a public hashrate pool.

Context

Bitcoin Optech provides weekly updates on Bitcoin development, including security advisories, protocol changes, and infrastructure news. This issue focuses on critical security fixes for legacy releases and the upcoming testnet5 genesis block mining event scheduled for late November 2026.

Limitations

Evidence covers only specific Bitcoin Core vulnerabilities and testnet5 mining plans; no data on testnet5 network status, node software requirements, or public pool details is provided.

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