an><a href="../Types/PkSigning/index.html#type-t">Types.PkSigning.t</a> Ctypes_static.ptr</span> <span>&#45;&gt;</span> <span>unit Ctypes_static.ptr</span> <span>&#45;&gt;</span> Unsigned.size_t <span>&#45;&gt;</span> <span>unit Ctypes_static.ptr</span> <span>&#45;&gt;</span> Unsigned.size_t <span>&#45;&gt;</span> Unsigned.size_t</code></dt><dd><p><code>pk_signing_key_from_seed sign pubkey pubkey_len seed seed_len</code></p><p>Initialise the signing object with a public/private keypair from a seed. The asso