Build and sign a binding. The signature is produced by the key
controlling claim. Throws if claim's scheme is not demos: or if
the controlling address does not match the connected wallet — the
invariant that ties channel signatures to on-chain identity.
Build and sign a binding. The signature is produced by the key controlling
claim. Throws ifclaim's scheme is notdemos:or if the controlling address does not match the connected wallet — the invariant that ties channel signatures to on-chain identity.