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Sources: Bitcoin Magazine · Bitcoin Optech · CoinDesk · Decrypt · The Block. Updated .

Security advisories

  • Checked

    COLDCARD Mk4 / Mk5 / Q: Advanced users only, new seeds only

    A firmware RNG integration error produced weak seeds; affected seeds were brute-forced offline and thefts began July 30, 2026. The devices were not remotely hacked.

  • Checked

    Ledger (current models): Acceptable for multi-asset users; buy only from ledger.com; leave Ledger Recover off

    Oct 2026: criminals fitted cellular implants into genuine Ledger devices sold through unauthorized Southeast Asian channels to capture seeds during setup. Ledger says the secure element, OS and servers were not compromised.

  • Checked

    BTCPay Server: Recommended for merchants on current version

    Versions before 2.4.2 let unauthenticated attackers fetch LND macaroons; this was exploited. On-chain wallets were not affected.

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