DCR Time is Decred's time stamping solution. It powers Politeia and anyone can use it to time-anchor data for free! You don't need to worry about someone changing the past, if it was timestamped using DCR Time.

DCR Time

01 - Minimizing trust is about simple and cheap verification. What if there was a way to verify the past with just one click?

02 - DCR Time is a free service that uses the Decred blockchain to hash and time-anchor files.

03 - This can be used to demonstrate a particular file existed at or before the time it was anchored.

04 - To minimize blockspace, a hash of each submitted file is calculated and sent to a dcrtime server.

These are then organized into merkle trees, and hashed down to merkle roots which are anchored once an hour.

05 - DCR Time was originally built to timestamp data from Politeia, Decred's proposal system.

06 - Now it can be used to timestamp any kind of data, and it even powers a Twitter timestamping bot.

07 - With verifiable proof that documents have not been tampered with, communities don't have to trust the admins who run the servers. While often overlooked, this tech levels the playing field for online discussion.