Sigsum is a free and open source project that brings transparency logging to signed checksums. Logging sigsums and not a more concrete type like certificates keeps the overall design simple and generally useful.
✔ Minimalistic design that simplifies log operations and usage
✔ Centralised log operations but distributed trust assumptions
✔ Discoverability of statements for data of your choice
A minimal statement encodes the following claim: the right data has a certain cryptographic hash. You can add additional meaning to each statement. For example, you may use a sigsum log to claim that
Sigsum logging makes it reasonable to believe your claims by adding enough discoverability to verify them.