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-# Witness cosigning
-Transparency logs were designed to be cryptographically verifiable in the
-presence of a gossip-audit model that ensures everyone observes _the same
-cryptographically verifiable log_.  The gossip-audit model is largely undefined
-in today's existing transparency logging ecosystems, which means that the logs
-must be trusted to play by the rules.   We wanted to avoid that outcome in our
-ecosystem.  Therefore, a gossip-audit model is built into the log.
-
-The basic idea is that an STH should only be considered valid if it is cosigned
-by a number of witnesses that verify the append-only property.  Which witnesses
-to trust and under what circumstances is defined by a client-side _witness
-cosigning policy_.  For example,
-	"require no witness cosigning",
-	"must have at least `k` signatures from witnesses A...J", and
-	"must have at least `k` signatures from witnesses A...J where one is from
-		witness B".
-
-Witness cosigning policies are beyond the scope of this specification.
-
-The log is configured with a list of witness namespaces. The only supported
-witness namespace format is `ed25519_v1`.  The signature must span a serialized
-`signed_tree_head_v1` item.
-
-## Public endpoints
-Witnesses are expected to poll the `next-cosi` endpoint.  If a new STH is
-obtained:
-1. Verify that the log is append-only by fetching a consistency proof from the
-latest STH that this witness co-signed.  Stop if no valid proof is available.
-2. Sign the STH and submit using the `add-cosi` API.
-
-### add-cosi
-```
-POST https://<base url>/st/v1/add-cosi
-```
-
-Input:
-- sth: an `StItem` of type `signed_tree_head_v1`.
-- namespace: a `Namespace` item of type `ed25519_v1`.
-- signature: covers the specified STH.
-
-Output:
-- None
-
-### get-cosi
-```
-GET https://<base url>/st/v1/get-cosi
-```
-
-Input:
-- None
-
-Output:
-- A map with keys "sth" and "signatures".  The former is an `StItem` of type
-`signed_tree_head_v1`.  The latter an array where each entry is a map with a
-"witness" (`ed25519_v1` namespace) and a "signature".
-
-### next-cosi
-```
-GET https://<base url>/st/v1/next-cosi
-```
-
-Input
-- None
-
-Output:
-- an `StItem` of type `signed_tree_head_v1`, which corresponds to the STH
-that is currently being cosigned. Stable for a period of time, e.g., 10 minutes.