You should check out drand (https://drand.love), which is based on threshold cryptography and the group running the network is composed of 16 independent organisations, none of which can manipulate or predict the next beacon. Beacons can be consumed from the public HTTP APIs (https://drand.love/developer/http-api/).

Lots of exciting features to land very soon that include Timelock Encryption, among several others.

Technical explainer can be found here: https://research.protocol.ai/tutorials/resnetlab-on-tour/dra... and documentation here: https://drand.love/docs/