Merge pull request #6188 from IntersectMBO/nbacquey/fix_k_discrepancy

Fix k discrepancy between byron and shelley genesis

Author: nbacquey

cardano-testnet/CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## Next version
 
+* [Fix discrepancy in security parameter between Byron and Shelley genesis files](https://github.com/IntersectMBO/cardano-node/pull/6188)
+
 ## 10.0.0
 
 * Bump for node 10

cardano-testnet/src/Testnet/Start/Byron.hs

@@ -29,7 +29,7 @@ data ByronGenesisOptions = ByronGenesisOptions
 byronDefaultGenesisOptions :: ByronGenesisOptions
 byronDefaultGenesisOptions = ByronGenesisOptions
   { byronNumBftNodes = 3
-  , byronSecurityParam = 10
+  , byronSecurityParam = 5
   -- TODO: createByronGenesis should have a check that errors
   -- if totalBalance can be evenly split between numBftNodes
   -- with no remainder. Having a remainder results in rounding errors.