diff --git a/abc/history.nim b/abc/history.nim
index 51f7943..c1d5f44 100644
--- a/abc/history.nim
+++ b/abc/history.nim
@@ -5,6 +5,7 @@ export sets
 
 type
   History* = object
+    genesis*: TxHash
     transactions*: HashSet[TxHash]
     missingTx*: HashSet[TxHash]
     missingAck*: HashSet[AckHash]
@@ -55,9 +56,11 @@ func past(store: TxStore, ackHash: AckHash, history: var History) =
     history.missingAck.incl(ackHash)
 
 func past*(store: TxStore, hash: TxHash|AckHash): History =
+  result.genesis = store.genesis
   store.past(hash, result)
 
 func past*(store: TxStore, hashes: varargs[AckHash]): History =
+  result.genesis = store.genesis
   for hash in hashes:
     store.past(hash, result)
 
diff --git a/tests/abc/testHistory.nim b/tests/abc/testHistory.nim
index faca38b..f2155b7 100644
--- a/tests/abc/testHistory.nim
+++ b/tests/abc/testHistory.nim
@@ -62,6 +62,14 @@ suite "Past transactions and acknowledgements":
     check store.past(ack1.hash, ack2.hash).transactions ==
       set(genesis.hash, tx1.hash, tx2.hash)
 
+  test "past contains the genesis hash":
+    var store = TxStore.init(genesis)
+    store.add(tx1, tx3)
+    store.add(ack3)
+    check store.past(tx1.hash).genesis == store.genesis
+    check store.past(tx3.hash).genesis == store.genesis
+    check store.past(ack3.hash).genesis == store.genesis
+
 suite "Transaction validation":
 
   let alice = PublicKey.alice