There are 4 changes to make here: * The first digest in our diff code must correspond to the digest-as-signed of the consensus document. * We must accept <n>,$d as an ed command. * We must have the first command in all our generated diffs be a command that deletes the signatures. * We must change our consdiffmgr index code to index diffs by the digest-as-signed of the original document. Thanks to Taylor Yu and Alexander Færøy for helping me figure out the right solution here.