The Torchwood repository is a collection of open-source tooling for tlogs.
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litewitness is a cosigning witness backed by SQLite and ssh-agent.
It implements c2sp.org/tlog-witness.
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litebastion (and filippo.io/torchwood/bastion) is a public-service reverse proxy.
It implements c2sp.org/https-bastion.
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filippo.io/torchwood implements a tlog client and various c2sp.org/signed-note, c2sp.org/tlog-cosignature, c2sp.org/tlog-checkpoint, and c2sp.org/tlog-tiles functions, including extensions to the golang.org/x/mod/sumdb/tlog and golang.org/x/mod/sumdb/note packages.