diff --git a/contrib/FastSync/sigs/JUnderwood.utxo-sets.asc b/contrib/FastSync/sigs/JUnderwood.utxo-sets.asc
new file mode 100644
index 0000000..ce82105
--- /dev/null
+++ b/contrib/FastSync/sigs/JUnderwood.utxo-sets.asc
@@ -0,0 +1,16 @@
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