From 1a97f7720576600119ab90eecbf8d228594ef2ba Mon Sep 17 00:00:00 2001
From: Jack Grigg <jack@z.cash>
Date: Thu, 28 Apr 2022 14:26:08 +0000
Subject: [PATCH] Update minimum chain work and set NU5 activation block hash
 for testnet

The chain work is taken from testnet block 1855000.

Closes zcash/zcash#5899.
---
 src/chainparams.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index 8ac5381e8..8975c53bc 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -419,6 +419,8 @@ public:
             uint256S("01a4d7c6aada30c87762c1bf33fff5df7266b1fd7616bfdb5227fa59bd79e7a2");
         consensus.vUpgrades[Consensus::UPGRADE_NU5].nProtocolVersion = 170050;
         consensus.vUpgrades[Consensus::UPGRADE_NU5].nActivationHeight = 1842420;
+        consensus.vUpgrades[Consensus::UPGRADE_NU5].hashActivationBlock =
+            uint256S("0006d75c60b3093d1b671ff7da11c99ea535df9927c02e6ed9eb898605eb7381");
         consensus.vUpgrades[Consensus::UPGRADE_ZFUTURE].nProtocolVersion = 0x7FFFFFFF;
         consensus.vUpgrades[Consensus::UPGRADE_ZFUTURE].nActivationHeight =
             Consensus::NetworkUpgrade::NO_ACTIVATION_HEIGHT;
@@ -542,7 +544,7 @@ public:
         consensus.nFutureTimestampSoftForkHeight = consensus.vUpgrades[Consensus::UPGRADE_BLOSSOM].nActivationHeight + 6;
 
         // The best chain should have at least this much work.
-        consensus.nMinimumChainWork = uint256S("00000000000000000000000000000000000000000000000000000025eb805e9c");
+        consensus.nMinimumChainWork = uint256S("000000000000000000000000000000000000000000000000000000263c0984a2");
 
         pchMessageStart[0] = 0xfa;
         pchMessageStart[1] = 0x1a;