dead-mans-switch

Secret Key is a product launch offering a password vault with an emergency-access feature that lets family members unlock your passwords if you become unable to do so yourself.

Show HN: Death Plan Switch，一个面向独立开发者的自托管死人开关工具。它每周通过邮件确认你是否安好，若未按时签到会依次提醒你、联系你的直系亲属，最后通知指定联系人，采用 MIT 协议免费开源，基于 PHP 8.1+，无需数据库。

The builders of a multi-agent system added a dead man's switch that alerts a human when all four outbound communication channels are blocked simultaneously, preventing silent failures. The fix includes a dedup guard to avoid repeated alerts.