From eab7efcae50c8d5f1051cfe4da0fce91fd3a09f0 Mon Sep 17 00:00:00 2001
From: sasha <sasha@z.cash>
Date: Tue, 22 Feb 2022 11:21:37 -0800
Subject: [PATCH] explain the 0x0f0f[..]0f0f powLimit constant for regtest

---
 src/chainparams.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index d117db8ee..a4bbf5efd 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -633,7 +633,7 @@ public:
         static_assert(equihash_parameters_acceptable(N, K));
         consensus.nEquihashN = N;
         consensus.nEquihashK = K;
-        consensus.powLimit = uint256S("0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f");
+        consensus.powLimit = uint256S("0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f"); // if this is any larger, the for loop in GetNextWorkRequired can overflow bnTot
         consensus.nPowAveragingWindow = 17;
         assert(maxUint/UintToArith256(consensus.powLimit) >= consensus.nPowAveragingWindow);
         consensus.nPowMaxAdjustDown = 0; // Turn off adjustment down