Timevault is an implementation of timelock encryption. Timelock encryption encrypts a message based on a timestamp. After that time has passed, anyone can decrypt the message. This is useful for embargoed messages, which should be distributed before the reveal time, for example, vulnerability notifications.

The blog post by the drand project introduces the concept and contains further tools.

A command line version for timelock encryption is available.

Timevault: Timelock Encryption