Time capsule letter
Nobody opens it before the day · no server holding it · changing the clock does not help
타임캡슐 편지
정한 날 전에는 아무도 못 여는 편지를 만듭니다. 맡아 두는 서버가 없어 잠긴 편지 자체가 주소가 됩니다
편지를 적고 열릴 때를 고르면, 그 전에는 아무도 못 여는 주소가 나옵니다.
열쇠는 공개 무작위 시계가 그날 내놓는 값으로만 맞춰집니다 — 만든 사람도, 받은 사람도, 이 사이트도 그 전에는 못 엽니다. 컴퓨터 시계를 바꿔도 열리지 않습니다. 대신 그 공개 시계가 계속 돌아야 열립니다.
A time capsule letter — write one nobody can open before the day you set. No server holds it: the locked letter itself is the address, and the key only comes together from what a public randomness beacon publishes on that day.
How to use it
- Write the letter
- Pick when it opens (tomorrow · a month · a year · ten years)
- Hit Lock it, then keep or send the link you get
- Open that link on the day and the letter is there
Common questions
- How is this different from other date-locked services?
- Most keep the letter on a server and send it on the day. That means an administrator can read it early, and if the service shuts down the letter goes with it. Here the locked letter *is* the address, so there is nothing being held anywhere.
- Can I open it by changing my computer’s clock?
- No, because the key is not on your computer. A public randomness beacon only publishes that round’s value once the time arrives, and without that value the key cannot be assembled.
- What if I lose the address?
- The letter goes with it. No copy is kept on our side. For anything important, write the address down in more than one place.
- What does it depend on?
- That public randomness beacon has to keep running for it to open. In exchange, no company can read the letter early.
Other tools
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