From cd817906b200583a12da09fc5a3709db82433ef6 Mon Sep 17 00:00:00 2001
From: Jeromy <jeromyj@gmail.com>
Date: Wed, 3 Jun 2020 18:30:43 -0700
Subject: [PATCH] handle sourcing randomness from a future block

---
 chain/store/store.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/chain/store/store.go b/chain/store/store.go
index c9dac2e31..72c77ee36 100644
--- a/chain/store/store.go
+++ b/chain/store/store.go
@@ -914,6 +914,10 @@ func (cs *ChainStore) GetRandomness(ctx context.Context, blks []cid.Cid, pers cr
 		return nil, err
 	}
 
+	if round > ts.Height() {
+		return DrawRandomness(ts.MinTicket().VRFProof, pers, round, entropy)
+	}
+
 	searchHeight := round
 	if searchHeight < 0 {
 		searchHeight = 0