Bitcoin Optech newsletter #420 is here: - relays advance notice of a planned Core Lightning security release - summarizes a discussion about opt-in replay protection for potential future forks - notes that the Hardware Wallet Interface (HWI) project will enter maintenance mode - describes a request for comments on using block-range filters - Optech Newsletter #420 Podcast Christian Decker described a forthcoming CLN v26.06.7 point security release, noting no vulnerability is known to be actively exploited... Moonsettler posted to Delving Bitcoin to discuss the possibility of introducing an opt-in replay protection mechanism in case of future forks... Ava Chow (achow101) announced that the Hardware Wallet Interface (HWI) project will scale back to maintenance-only work and eventually be archived... Optout posted to Delving Bitcoin a request for comments (RFC) on a proposal to use block-range filters to reduce the total download size when using compact block filters... Bitcoin Optech will host an audio recap discussion of this newsletter streaming live on X/Twitter Tuesday at 16:30 UTC.