diff --git a/chainweb.cabal b/chainweb.cabal
index d7dc341fd3..417465bc51 100644
--- a/chainweb.cabal
+++ b/chainweb.cabal
@@ -237,6 +237,7 @@ library
         , Chainweb.Utils.RequestLog
         , Chainweb.Utils.Rule
         , Chainweb.Utils.Serialization
+        , Chainweb.VerifierPlugin
         , Chainweb.Version
         , Chainweb.Version.Development
         , Chainweb.Version.FastDevelopment
diff --git a/src/Chainweb/VerifierPlugin.hs b/src/Chainweb/VerifierPlugin.hs
index 5c40519212..d2654f6b87 100644
--- a/src/Chainweb/VerifierPlugin.hs
+++ b/src/Chainweb/VerifierPlugin.hs
@@ -1,6 +1,7 @@
 {-# language DerivingStrategies #-}
 {-# language EmptyCase #-}
 {-# language GeneralizedNewtypeDeriving #-}
+{-# language OverloadedStrings #-}
 {-# language TupleSections #-}
 {-# language TypeApplications #-}
 
diff --git a/src/Chainweb/Version.hs b/src/Chainweb/Version.hs
index c36fb22054..99b8e702be 100644
--- a/src/Chainweb/Version.hs
+++ b/src/Chainweb/Version.hs
@@ -63,6 +63,7 @@ module Chainweb.Version
     , versionName
     , versionWindow
     , versionGenesis
+    , versionVerifierPlugins
     , genesisBlockPayload
     , genesisBlockPayloadHash
     , genesisBlockTarget
@@ -134,11 +135,6 @@ import Data.HashMap.Strict (HashMap)
 import qualified Data.HashMap.Strict as HM
 import qualified Data.HashSet as HS
 import Data.Map.Strict(Map)
-import qualified Data.Map.Strict as Map
-import qualified Data.Map.Merge.Strict as Merge
-import Data.Set(Set)
-import qualified Data.Set as Set
-import Data.Maybe
 import Data.Proxy
 import qualified Data.Text as T
 import Data.Word
diff --git a/src/Chainweb/Version/Development.hs b/src/Chainweb/Version/Development.hs
index 2d3e3b2eeb..28973bee5d 100644
--- a/src/Chainweb/Version/Development.hs
+++ b/src/Chainweb/Version/Development.hs
@@ -67,6 +67,7 @@ devnet = ChainwebVersion
             Chainweb219Pact -> AllChains $ ForkAtBlockHeight $ BlockHeight 550
             Chainweb220Pact -> AllChains $ ForkAtBlockHeight $ BlockHeight 560
             Chainweb221Pact -> AllChains $ ForkAtBlockHeight $ BlockHeight 580
+            EnableVerifiers -> AllChains ForkNever
 
     , _versionUpgrades = foldr (chainZip HM.union) (AllChains mempty)
         [ forkUpgrades devnet
@@ -109,4 +110,5 @@ devnet = ChainwebVersion
         { _disablePeerValidation = True
         , _disableMempoolSync = False
         }
+    , _versionVerifierPlugins = AllChains $ End $ mempty
     }
diff --git a/src/Chainweb/Version/FastDevelopment.hs b/src/Chainweb/Version/FastDevelopment.hs
index 984daf3983..3f1a7f61ad 100644
--- a/src/Chainweb/Version/FastDevelopment.hs
+++ b/src/Chainweb/Version/FastDevelopment.hs
@@ -55,4 +55,5 @@ fastDevnet = ChainwebVersion
         { _disablePeerValidation = True
         , _disableMempoolSync = False
         }
+    , _versionVerifierPlugins = AllChains $ End $ mempty
     }
diff --git a/src/Chainweb/Version/Mainnet.hs b/src/Chainweb/Version/Mainnet.hs
index 75494fb991..23491aa926 100644
--- a/src/Chainweb/Version/Mainnet.hs
+++ b/src/Chainweb/Version/Mainnet.hs
@@ -141,6 +141,7 @@ mainnet = ChainwebVersion
         Chainweb219Pact -> AllChains (ForkAtBlockHeight $ BlockHeight 3_774_423) -- 2023-06-02 00:00:00+00:00
         Chainweb220Pact -> AllChains (ForkAtBlockHeight $ BlockHeight 4_056_499) -- 2023-09-08 00:00:00+00:00
         Chainweb221Pact -> AllChains (ForkAtBlockHeight $ BlockHeight 4_177_889) -- 2023-10-20 00:00:00+00:00
+        EnableVerifiers -> AllChains ForkNever
 
     , _versionGraphs =
         (to20ChainsMainnet, twentyChainGraph) `Above`
@@ -201,4 +202,5 @@ mainnet = ChainwebVersion
         { _disablePeerValidation = False
         , _disableMempoolSync = False
         }
+    , _versionVerifierPlugins = AllChains $ End $ mempty
     }
diff --git a/src/Chainweb/Version/Testnet.hs b/src/Chainweb/Version/Testnet.hs
index c6e198c052..e0d15a7eaa 100644
--- a/src/Chainweb/Version/Testnet.hs
+++ b/src/Chainweb/Version/Testnet.hs
@@ -121,6 +121,7 @@ testnet = ChainwebVersion
         Chainweb219Pact -> AllChains $ ForkAtBlockHeight $ BlockHeight 3_299_753 -- 2023-06-01 12:00:00+00:00
         Chainweb220Pact -> AllChains $ ForkAtBlockHeight $ BlockHeight 3_580_964 -- 2023-09-08 12:00:00+00:00
         Chainweb221Pact -> AllChains $ ForkAtBlockHeight $ BlockHeight 3_702_250 -- 2023-10-19 12:00:00+00:00
+        EnableVerifiers -> AllChains ForkNever
 
     , _versionGraphs =
         (to20ChainsTestnet, twentyChainGraph) `Above`
@@ -172,4 +173,5 @@ testnet = ChainwebVersion
         { _disablePeerValidation = False
         , _disableMempoolSync = False
         }
+    , _versionVerifierPlugins = AllChains $ End $ mempty
     }
diff --git a/test/Chainweb/Test/TestVersions.hs b/test/Chainweb/Test/TestVersions.hs
index a79066ae13..b030ed44d0 100644
--- a/test/Chainweb/Test/TestVersions.hs
+++ b/test/Chainweb/Test/TestVersions.hs
@@ -109,6 +109,7 @@ testVersionTemplate v = v
     & versionWindow .~ WindowWidth 120
     & versionMaxBlockGasLimit .~ End (Just 2_000_000)
     & versionBootstraps .~ [testBootstrapPeerInfos]
+    & versionVerifierPlugins .~ AllChains (End mempty)
 
 -- | A set of fork heights which are relatively fast, but not fast enough to break anything.
 fastForks :: HashMap Fork (ChainMap ForkHeight)
@@ -139,6 +140,7 @@ fastForks = tabulateHashMap $ \case
     Chainweb219Pact -> AllChains $ ForkAtBlockHeight $ BlockHeight 27
     Chainweb220Pact -> AllChains $ ForkAtBlockHeight $ BlockHeight 30
     Chainweb221Pact -> AllChains $ ForkAtBlockHeight $ BlockHeight 33
+    EnableVerifiers -> AllChains $ ForkAtBlockHeight $ BlockHeight 35
 
 -- | A test version without Pact or PoW, with only one chain graph.
 barebonesTestVersion :: ChainGraph -> ChainwebVersion
@@ -260,6 +262,7 @@ slowForkingCpmTestVersion g = buildTestVersion $ \v -> v
         Chainweb219Pact -> AllChains $ ForkAtBlockHeight (BlockHeight 71)
         Chainweb220Pact -> AllChains $ ForkAtBlockHeight (BlockHeight 85)
         Chainweb221Pact -> AllChains $ ForkAtBlockHeight (BlockHeight 100)
+        EnableVerifiers -> AllChains $ ForkAtBlockHeight (BlockHeight 110)
 
 -- | CPM version (see `cpmTestVersion`) with forks and upgrades quickly enabled.
 fastForkingCpmTestVersion :: ChainGraph -> ChainwebVersion
@@ -275,4 +278,3 @@ noBridgeCpmTestVersion g = buildTestVersion $ \v -> v
     & cpmTestVersion g
     & versionName .~ ChainwebVersionName ("nobridge-CPM-" <> toText g)
     & versionForks .~ (fastForks & at SPVBridge ?~ AllChains ForkNever)
-