The public log

Every stamp is an entry in this append-only log. Entries can be added but never changed or removed without it showing. Anyone can download and mirror it.

Latest checkpoint

A checkpoint is a signed summary of the whole log: its size and a single root hash computed from every entry. If any past entry were changed, the root hash would change.

Entries

External anchors

Independent timestamping authorities timestamp our checkpoints. Their tokens prove the log already had this content at their time, so entries can't be backdated past them. Why this matters.

Raw data

• Latest checkpoint: /checkpoint
• Log tiles (C2SP tlog-tiles layout): /tile/…. Each entry is the DER-encoded RFC 3161 TSTInfo of a stamp.
• Keys and certificates: /.well-known/existence-proof-keys