diff --git a/core/evm.go b/core/evm.go
index b7d48afd76..3c6a6cf21b 100644
--- a/core/evm.go
+++ b/core/evm.go
@@ -41,6 +41,7 @@ import (
 	"github.com/ava-labs/libevm/core/state"
 	"github.com/ava-labs/libevm/core/types"
 	"github.com/ava-labs/libevm/core/vm"
+	"github.com/ava-labs/libevm/libevm"
 	"github.com/ava-labs/libevm/libevm/stateconf"
 	"github.com/holiman/uint256"
 )
@@ -56,6 +57,16 @@ func RegisterExtras() {
 	vm.RegisterHooks(hooks{})
 }
 
+// WithTempRegisteredExtras runs `fn` with temporary registration otherwise
+// equivalent to a call to [RegisterExtras], but limited to the life of `fn`.
+//
+// This function is not intended for direct use. Use
+// `evm.WithTempRegisteredLibEVMExtras()` instead as it calls this along with
+// all other temporary-registration functions.
+func WithTempRegisteredExtras(lock libevm.ExtrasLock, fn func() error) error {
+	return vm.WithTempRegisteredHooks(lock, hooks{}, fn)
+}
+
 type hooks struct{}
 
 // OverrideNewEVMArgs is a hook that is called in [vm.NewEVM].
diff --git a/core/extstate/statedb.go b/core/extstate/statedb.go
index ab0393a9ee..a5301d43fe 100644
--- a/core/extstate/statedb.go
+++ b/core/extstate/statedb.go
@@ -10,6 +10,7 @@ import (
 	"github.com/ava-labs/libevm/common"
 	"github.com/ava-labs/libevm/core/state"
 	"github.com/ava-labs/libevm/core/types"
+	"github.com/ava-labs/libevm/libevm"
 	"github.com/ava-labs/libevm/libevm/stateconf"
 	"github.com/holiman/uint256"
 
@@ -28,6 +29,16 @@ func RegisterExtras() {
 	state.RegisterExtras(normalizeStateKeysHook{})
 }
 
+// WithTempRegisteredExtras runs `fn` with temporary registration otherwise
+// equivalent to a call to [RegisterExtras], but limited to the life of `fn`.
+//
+// This function is not intended for direct use. Use
+// `evm.WithTempRegisteredLibEVMExtras()` instead as it calls this along with
+// all other temporary-registration functions.
+func WithTempRegisteredExtras(lock libevm.ExtrasLock, fn func() error) error {
+	return state.WithTempRegisteredExtras(lock, normalizeStateKeysHook{}, fn)
+}
+
 type normalizeStateKeysHook struct{}
 
 // TransformStateKey transforms all keys with [normalizeStateKey].
diff --git a/go.mod b/go.mod
index 9fb08caed6..7c506a91db 100644
--- a/go.mod
+++ b/go.mod
@@ -18,7 +18,7 @@ require (
 	github.com/VictoriaMetrics/fastcache v1.12.1
 	github.com/ava-labs/avalanchego v1.13.6-0.20251007213349-63cc1a166a56
 	github.com/ava-labs/firewood-go-ethhash/ffi v0.0.13
-	github.com/ava-labs/libevm v1.13.15-0.20251002164226-35926db4d661
+	github.com/ava-labs/libevm v1.13.15-0.20251016142715-1bccf4f2ddb2
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc
 	github.com/deckarep/golang-set/v2 v2.1.0
 	github.com/fjl/gencodec v0.1.1
@@ -44,11 +44,11 @@ require (
 	go.uber.org/goleak v1.3.0
 	go.uber.org/mock v0.5.0
 	go.uber.org/zap v1.27.0
-	golang.org/x/crypto v0.42.0
+	golang.org/x/crypto v0.43.0
 	golang.org/x/exp v0.0.0-20241215155358-4a5509556b9e
 	golang.org/x/sync v0.17.0
 	golang.org/x/time v0.12.0
-	golang.org/x/tools v0.37.0
+	golang.org/x/tools v0.38.0
 	google.golang.org/protobuf v1.36.8
 	gopkg.in/natefinch/lumberjack.v2 v2.0.0
 )
@@ -163,12 +163,12 @@ require (
 	go.opentelemetry.io/otel/trace v1.37.0 // indirect
 	go.opentelemetry.io/proto/otlp v1.7.0 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
-	golang.org/x/mod v0.28.0 // indirect
-	golang.org/x/net v0.44.0 // indirect
+	golang.org/x/mod v0.29.0 // indirect
+	golang.org/x/net v0.46.0 // indirect
 	golang.org/x/oauth2 v0.30.0 // indirect
-	golang.org/x/sys v0.36.0 // indirect
-	golang.org/x/term v0.35.0 // indirect
-	golang.org/x/text v0.29.0 // indirect
+	golang.org/x/sys v0.37.0 // indirect
+	golang.org/x/term v0.36.0 // indirect
+	golang.org/x/text v0.30.0 // indirect
 	gonum.org/v1/gonum v0.16.0 // indirect
 	google.golang.org/genproto/googleapis/api v0.0.0-20250707201910-8d1bb00bc6a7 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20250818200422-3122310a409c // indirect
diff --git a/go.sum b/go.sum
index eb74837482..11bad72878 100644
--- a/go.sum
+++ b/go.sum
@@ -30,8 +30,8 @@ github.com/ava-labs/avalanchego v1.13.6-0.20251007213349-63cc1a166a56 h1:Q4lnXtj
 github.com/ava-labs/avalanchego v1.13.6-0.20251007213349-63cc1a166a56/go.mod h1:EL0MGbL2liE9jp4QtCHR2thkNl8hCkD26DJ+7cmcaqs=
 github.com/ava-labs/firewood-go-ethhash/ffi v0.0.13 h1:obPwnVCkF5+B2f8WbTepHj0ZgiW21vKUgFCtATuAYNY=
 github.com/ava-labs/firewood-go-ethhash/ffi v0.0.13/go.mod h1:gsGr1ICjokI9CyPaaRHMqDoDCaT1VguC/IyOTx6rJ14=
-github.com/ava-labs/libevm v1.13.15-0.20251002164226-35926db4d661 h1:lt4yQE1HMvxWrdD5RFj+h9kWUsZK2rmNohvkeQsbG9M=
-github.com/ava-labs/libevm v1.13.15-0.20251002164226-35926db4d661/go.mod h1:ivRC/KojP8sai7j8WnpXIReQpcRklL2bIzoysnjpARQ=
+github.com/ava-labs/libevm v1.13.15-0.20251016142715-1bccf4f2ddb2 h1:hQ15IJxY7WOKqeJqCXawsiXh0NZTzmoQOemkWHz7rr4=
+github.com/ava-labs/libevm v1.13.15-0.20251016142715-1bccf4f2ddb2/go.mod h1:DqSotSn4Dx/UJV+d3svfW8raR+cH7+Ohl9BpsQ5HlGU=
 github.com/aymerick/raymond v2.0.3-0.20180322193309-b565731e1464+incompatible/go.mod h1:osfaiScAUVup+UC9Nfq76eWqDhXlp+4UYaA8uhTBO6g=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
@@ -578,8 +578,8 @@ golang.org/x/crypto v0.0.0-20191227163750-53104e6ec876/go.mod h1:LzIPMQfyMNhhGPh
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20210322153248-0c34fe9e7dc2/go.mod h1:T9bdIzuCu7OtxOm1hfPfRQxPLYneinmdGuTeoZ9dtd4=
 golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
-golang.org/x/crypto v0.42.0 h1:chiH31gIWm57EkTXpwnqf8qeuMUi0yekh6mT2AvFlqI=
-golang.org/x/crypto v0.42.0/go.mod h1:4+rDnOTJhQCx2q7/j6rAN5XDw8kPjeaXEUR2eL94ix8=
+golang.org/x/crypto v0.43.0 h1:dduJYIi3A3KOfdGOHX8AVZ/jGiyPa3IbBozJ5kNuE04=
+golang.org/x/crypto v0.43.0/go.mod h1:BFbav4mRNlXJL4wNeejLpWxB7wMbc79PdRGhWKncxR0=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20241215155358-4a5509556b9e h1:4qufH0hlUYs6AO6XmZC3GqfDPGSXHVXUFR6OND+iJX4=
 golang.org/x/exp v0.0.0-20241215155358-4a5509556b9e/go.mod h1:qj5a5QZpwLU2NLQudwIN5koi3beDhSAlJwa67PuM98c=
@@ -592,8 +592,8 @@ golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
-golang.org/x/mod v0.28.0 h1:gQBtGhjxykdjY9YhZpSlZIsbnaE2+PgjfLWUQTnoZ1U=
-golang.org/x/mod v0.28.0/go.mod h1:yfB/L0NOf/kmEbXjzCPOx1iK1fRutOydrCMsqRhEBxI=
+golang.org/x/mod v0.29.0 h1:HV8lRxZC4l2cr3Zq1LvtOsi/ThTgWnUk/y64QSs8GwA=
+golang.org/x/mod v0.29.0/go.mod h1:NyhrlYXJ2H4eJiRy/WDBO6HMqZQ6q9nk4JzS3NuCK+w=
 golang.org/x/net v0.0.0-20180719180050-a680a1efc54d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
@@ -618,8 +618,8 @@ golang.org/x/net v0.0.0-20211008194852-3b03d305991f/go.mod h1:9nx3DQGgdP8bBQD5qx
 golang.org/x/net v0.0.0-20220225172249-27dd8689420f/go.mod h1:CfG3xpIq0wQ8r1q4Su4UZFWDARRcnwPjda9FqA0JpMk=
 golang.org/x/net v0.0.0-20220607020251-c690dde0001d/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
 golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
-golang.org/x/net v0.44.0 h1:evd8IRDyfNBMBTTY5XRF1vaZlD+EmWx6x8PkhR04H/I=
-golang.org/x/net v0.44.0/go.mod h1:ECOoLqd5U3Lhyeyo/QDCEVQ4sNgYsqvCZ722XogGieY=
+golang.org/x/net v0.46.0 h1:giFlY12I07fugqwPuWJi68oOnpfqFnJIJzaIIm2JVV4=
+golang.org/x/net v0.46.0/go.mod h1:Q9BGdFy1y4nkUwiLvT5qtyhAnEHgnQ/zd8PfU6nc210=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.30.0 h1:dnDm7JmhM45NNpd8FDDeLhK6FwqbOf4MLCM9zb1BOHI=
 golang.org/x/oauth2 v0.30.0/go.mod h1:B++QgG3ZKulg6sRPGD/mqlHQs5rB3Ml9erfeDY7xKlU=
@@ -671,12 +671,12 @@ golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.36.0 h1:KVRy2GtZBrk1cBYA7MKu5bEZFxQk4NIDV6RLVcC8o0k=
-golang.org/x/sys v0.36.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
+golang.org/x/sys v0.37.0 h1:fdNQudmxPjkdUTPnLn5mdQv7Zwvbvpaxqs831goi9kQ=
+golang.org/x/sys v0.37.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
-golang.org/x/term v0.35.0 h1:bZBVKBudEyhRcajGcNc3jIfWPqV4y/Kt2XcoigOWtDQ=
-golang.org/x/term v0.35.0/go.mod h1:TPGtkTLesOwf2DE8CgVYiZinHAOuy5AYUYT1lENIZnA=
+golang.org/x/term v0.36.0 h1:zMPR+aF8gfksFprF/Nc/rd1wRS1EI6nDBGyWAvDzx2Q=
+golang.org/x/term v0.36.0/go.mod h1:Qu394IJq6V6dCBRgwqshf3mPF85AqzYEzofzRdZkWss=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
@@ -684,8 +684,8 @@ golang.org/x/text v0.3.5/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
 golang.org/x/text v0.3.8/go.mod h1:E6s5w1FMmriuDzIBO73fBruAKo1PCIq6d2Q6DHfQ8WQ=
-golang.org/x/text v0.29.0 h1:1neNs90w9YzJ9BocxfsQNHKuAT4pkghyXc4nhZ6sJvk=
-golang.org/x/text v0.29.0/go.mod h1:7MhJOA9CD2qZyOKYazxdYMF85OwPdEr9jTtBpO7ydH4=
+golang.org/x/text v0.30.0 h1:yznKA/E9zq54KzlzBEAWn1NXSQ8DIp/NYMy88xJjl4k=
+golang.org/x/text v0.30.0/go.mod h1:yDdHFIX9t+tORqspjENWgzaCVXgk0yYnYuSZ8UzzBVM=
 golang.org/x/time v0.0.0-20201208040808-7e3f01d25324/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.12.0 h1:ScB/8o8olJvc+CQPWrK3fPZNfh7qgwCrY0zJmoEQLSE=
 golang.org/x/time v0.12.0/go.mod h1:CDIdPxbZBQxdj6cxyCIdrNogrJKMJ7pr37NYpMcMDSg=
@@ -704,8 +704,8 @@ golang.org/x/tools v0.0.0-20201224043029-2b0845dc783e/go.mod h1:emZCQorbCU4vsT4f
 golang.org/x/tools v0.0.0-20210106214847-113979e3529a/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
 golang.org/x/tools v0.1.3/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
 golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
-golang.org/x/tools v0.37.0 h1:DVSRzp7FwePZW356yEAChSdNcQo6Nsp+fex1SUW09lE=
-golang.org/x/tools v0.37.0/go.mod h1:MBN5QPQtLMHVdvsbtarmTNukZDdgwdwlO5qGacAzF0w=
+golang.org/x/tools v0.38.0 h1:Hx2Xv8hISq8Lm16jvBZ2VQf+RLmbd7wVUsALibYI/IQ=
+golang.org/x/tools v0.38.0/go.mod h1:yEsQ/d/YK8cjh0L6rZlY8tgtlKiBNTL14pGDJPJpYQs=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/params/config.go b/params/config.go
index 23e1770834..ed85231172 100644
--- a/params/config.go
+++ b/params/config.go
@@ -32,6 +32,7 @@ import (
 
 	"github.com/ava-labs/coreth/params/extras"
 	"github.com/ava-labs/coreth/utils"
+	"github.com/ava-labs/libevm/libevm"
 	ethparams "github.com/ava-labs/libevm/params"
 )
 
@@ -46,7 +47,12 @@ var (
 )
 
 func init() {
-	WithTempRegisteredExtras(initialiseChainConfigs)
+	libevm.WithTemporaryExtrasLock(func(l libevm.ExtrasLock) error {
+		return WithTempRegisteredExtras(l, func() error {
+			initialiseChainConfigs()
+			return nil
+		})
+	})
 }
 
 var (
diff --git a/params/config_libevm.go b/params/config_libevm.go
index 104b3b6f35..4bb4d112d4 100644
--- a/params/config_libevm.go
+++ b/params/config_libevm.go
@@ -7,6 +7,7 @@ import (
 	"math/big"
 
 	"github.com/ava-labs/libevm/common"
+	"github.com/ava-labs/libevm/libevm"
 
 	"github.com/ava-labs/coreth/params/extras"
 	"github.com/ava-labs/coreth/precompile/modules"
@@ -34,16 +35,22 @@ func RegisterExtras() {
 }
 
 // WithTempRegisteredExtras runs `fn` with temporary registration otherwise
-// equivalent to a call to [RegisterExtras], but limited to the life of `fn`. It
-// is not threadsafe.
-func WithTempRegisteredExtras(fn func()) {
+// equivalent to a call to [RegisterExtras], but limited to the life of `fn`.
+//
+// This function is not intended for direct use. Use
+// `evm.WithTempRegisteredLibEVMExtras()` instead as it calls this along with
+// all other temporary-registration functions.
+func WithTempRegisteredExtras(lock libevm.ExtrasLock, fn func() error) error {
 	old := payloads
 	defer func() { payloads = old }()
 
-	ethparams.WithTempRegisteredExtras(extrasToRegister(), func(extras ethparams.ExtraPayloads[*extras.ChainConfig, RulesExtra]) {
-		payloads = extras
-		fn()
-	})
+	return ethparams.WithTempRegisteredExtras(
+		lock, extrasToRegister(),
+		func(extras ethparams.ExtraPayloads[*extras.ChainConfig, RulesExtra]) error {
+			payloads = extras
+			return fn()
+		},
+	)
 }
 
 var payloads ethparams.ExtraPayloads[*extras.ChainConfig, RulesExtra]
diff --git a/plugin/evm/customtypes/aliases_test.go b/plugin/evm/customtypes/aliases_test.go
new file mode 100644
index 0000000000..fea81f6e4a
--- /dev/null
+++ b/plugin/evm/customtypes/aliases_test.go
@@ -0,0 +1,41 @@
+// Copyright (C) 2019-2025, Ava Labs, Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+package customtypes
+
+import "github.com/ava-labs/libevm/core/types"
+
+// TODO(arr4n) These tests were originally part of the `coreth/core/types`
+// package so assume the presence of identifiers. Aliases reduce PR noise during
+// the refactoring.
+
+type (
+	AccessListTx      = types.AccessListTx
+	Block             = types.Block
+	BlockNonce        = types.BlockNonce
+	Bloom             = types.Bloom
+	Body              = types.Body
+	DynamicFeeTx      = types.DynamicFeeTx
+	Header            = types.Header
+	LegacyTx          = types.LegacyTx
+	Log               = types.Log
+	Receipt           = types.Receipt
+	ReceiptForStorage = types.ReceiptForStorage
+	Receipts          = types.Receipts
+	Transaction       = types.Transaction
+	Transactions      = types.Transactions
+	Withdrawal        = types.Withdrawal
+	Withdrawals       = types.Withdrawals
+)
+
+var (
+	// Function aliases in production code MUST be `func` declarations, not
+	// variables; this is only acceptable in tests.
+	CopyHeader      = types.CopyHeader
+	MustSignNewTx   = types.MustSignNewTx
+	NewBlock        = types.NewBlock
+	NewLondonSigner = types.NewLondonSigner
+	NewTransaction  = types.NewTransaction
+)
+
+const ReceiptStatusSuccessful = types.ReceiptStatusSuccessful
diff --git a/plugin/evm/customtypes/block_ext_test.go b/plugin/evm/customtypes/block_ext_test.go
index 762411c9f8..51d15b610c 100644
--- a/plugin/evm/customtypes/block_ext_test.go
+++ b/plugin/evm/customtypes/block_ext_test.go
@@ -20,11 +20,6 @@ import (
 
 	"github.com/ava-labs/coreth/utils"
 	"github.com/ava-labs/coreth/utils/utilstest"
-
-	// TODO(arr4n) These tests were originally part of the `coreth/core/types`
-	// package so assume the presence of identifiers. A dot-import reduces PR
-	// noise during the refactoring.
-	. "github.com/ava-labs/libevm/core/types"
 )
 
 func TestCopyHeader(t *testing.T) {
diff --git a/plugin/evm/customtypes/header_ext_test.go b/plugin/evm/customtypes/header_ext_test.go
index 8791ec4a4a..1cd09849b1 100644
--- a/plugin/evm/customtypes/header_ext_test.go
+++ b/plugin/evm/customtypes/header_ext_test.go
@@ -19,11 +19,6 @@ import (
 	"github.com/stretchr/testify/require"
 
 	"github.com/ava-labs/coreth/utils/utilstest"
-
-	// TODO(arr4n) These tests were originally part of the `coreth/core/types`
-	// package so assume the presence of identifiers. A dot-import reduces PR
-	// noise during the refactoring.
-	. "github.com/ava-labs/libevm/core/types"
 )
 
 func TestHeaderRLP(t *testing.T) {
diff --git a/plugin/evm/customtypes/libevm.go b/plugin/evm/customtypes/libevm.go
index 4ef0fe9246..132ac4abf3 100644
--- a/plugin/evm/customtypes/libevm.go
+++ b/plugin/evm/customtypes/libevm.go
@@ -3,7 +3,11 @@
 
 package customtypes
 
-import ethtypes "github.com/ava-labs/libevm/core/types"
+import (
+	"github.com/ava-labs/libevm/libevm"
+
+	ethtypes "github.com/ava-labs/libevm/core/types"
+)
 
 var extras ethtypes.ExtraPayloads[*HeaderExtra, *BlockBodyExtra, isMultiCoin]
 
@@ -21,3 +25,22 @@ func Register() {
 		isMultiCoin,
 	]()
 }
+
+// WithTempRegisteredExtras runs `fn` with temporary registration otherwise
+// equivalent to a call to [RegisterExtras], but limited to the life of `fn`.
+//
+// This function is not intended for direct use. Use
+// `evm.WithTempRegisteredLibEVMExtras()` instead as it calls this along with
+// all other temporary-registration functions.
+func WithTempRegisteredExtras(lock libevm.ExtrasLock, fn func() error) error {
+	old := extras
+	defer func() { extras = old }()
+
+	return ethtypes.WithTempRegisteredExtras[HeaderExtra, BlockBodyExtra, isMultiCoin](
+		lock,
+		func(e ethtypes.ExtraPayloads[*HeaderExtra, *BlockBodyExtra, isMultiCoin]) error {
+			extras = e
+			return fn()
+		},
+	)
+}
diff --git a/plugin/evm/customtypes/rlp_fuzzer_test.go b/plugin/evm/customtypes/rlp_fuzzer_test.go
index 18f7871c20..46d7e507b6 100644
--- a/plugin/evm/customtypes/rlp_fuzzer_test.go
+++ b/plugin/evm/customtypes/rlp_fuzzer_test.go
@@ -35,11 +35,6 @@ import (
 
 	"github.com/ava-labs/libevm/rlp"
 	"github.com/holiman/uint256"
-
-	// TODO(arr4n) These tests were originally part of the `coreth/core/types`
-	// package so assume the presence of identifiers. A dot-import reduces PR
-	// noise during the refactoring.
-	. "github.com/ava-labs/libevm/core/types"
 )
 
 func decodeEncode(input []byte, val interface{}) error {
diff --git a/plugin/evm/customtypes/types_test.go b/plugin/evm/customtypes/types_test.go
index f14ca6d260..8563f7b112 100644
--- a/plugin/evm/customtypes/types_test.go
+++ b/plugin/evm/customtypes/types_test.go
@@ -35,11 +35,6 @@ import (
 	"github.com/ava-labs/libevm/common"
 	"github.com/ava-labs/libevm/crypto"
 	"github.com/ava-labs/libevm/rlp"
-
-	// TODO(arr4n) These tests were originally part of the `coreth/core/types`
-	// package so assume the presence of identifiers. A dot-import reduces PR
-	// noise during the refactoring.
-	. "github.com/ava-labs/libevm/core/types"
 )
 
 func TestMain(m *testing.M) {
diff --git a/plugin/evm/libevm.go b/plugin/evm/libevm.go
index b1f7dff8e5..8bd86faf89 100644
--- a/plugin/evm/libevm.go
+++ b/plugin/evm/libevm.go
@@ -4,6 +4,8 @@
 package evm
 
 import (
+	"github.com/ava-labs/libevm/libevm"
+
 	"github.com/ava-labs/coreth/core"
 	"github.com/ava-labs/coreth/core/extstate"
 	"github.com/ava-labs/coreth/params"
@@ -24,3 +26,21 @@ func RegisterAllLibEVMExtras() {
 	extstate.RegisterExtras()
 	params.RegisterExtras()
 }
+
+// WithTempRegisteredLibEVMExtras runs `fn` with temporary registration
+// otherwise equivalent to a call to [RegisterAllLibEVMExtras], but limited to
+// the life of `fn`.
+func WithTempRegisteredLibEVMExtras(fn func() error) error {
+	return libevm.WithTemporaryExtrasLock(func(lock libevm.ExtrasLock) error {
+		for _, wrap := range []func(libevm.ExtrasLock, func() error) error{
+			core.WithTempRegisteredExtras,
+			customtypes.WithTempRegisteredExtras,
+			extstate.WithTempRegisteredExtras,
+			params.WithTempRegisteredExtras,
+		} {
+			inner := fn
+			fn = func() error { return wrap(lock, inner) }
+		}
+		return fn()
+	})
+}
diff --git a/plugin/evm/tempextrastest/tempextras_test.go b/plugin/evm/tempextrastest/tempextras_test.go
new file mode 100644
index 0000000000..ecb08bb124
--- /dev/null
+++ b/plugin/evm/tempextrastest/tempextras_test.go
@@ -0,0 +1,84 @@
+// Copyright (C) 2019-2025, Ava Labs, Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+// Package tempextrastest exists solely to test [evm.WithTempRegisteredLibEVMExtras]
+// because the primary [evm] tests leak goroutines. These result in race
+// conditions with the temporary registration of extras, which is intended to be
+// done separately.
+package tempextrastest
+
+import (
+	"testing"
+
+	"github.com/ava-labs/libevm/core/state"
+	"github.com/ava-labs/libevm/core/types"
+	"github.com/ava-labs/libevm/core/vm"
+	"github.com/ava-labs/libevm/params"
+	"github.com/stretchr/testify/require"
+
+	"github.com/ava-labs/coreth/plugin/evm"
+	"github.com/ava-labs/coreth/plugin/evm/customtypes"
+
+	cparams "github.com/ava-labs/coreth/params"
+)
+
+func TestWithTempRegisteredLibEVMExtras(t *testing.T) {
+	params.TestOnlyClearRegisteredExtras()
+	state.TestOnlyClearRegisteredExtras()
+	types.TestOnlyClearRegisteredExtras()
+	vm.TestOnlyClearRegisteredHooks()
+
+	var reRegistered bool
+	t.Cleanup(func() {
+		if !reRegistered {
+			evm.RegisterAllLibEVMExtras()
+		}
+	})
+
+	payloadTests := map[string]func(t *testing.T){
+		"customtypes": func(t *testing.T) {
+			t.Helper()
+			require.False(t, customtypes.IsAccountMultiCoin(&types.StateAccount{}))
+		},
+		"params": func(t *testing.T) {
+			t.Helper()
+			require.False(t, cparams.GetRulesExtra(params.Rules{}).IsEtna)
+		},
+	}
+
+	t.Run("with_temp_registration", func(t *testing.T) {
+		err := evm.WithTempRegisteredLibEVMExtras(func() error {
+			t.Run("payloads", func(t *testing.T) {
+				for pkg, fn := range payloadTests {
+					t.Run(pkg, fn)
+				}
+			})
+			return nil
+		})
+		require.NoError(t, err)
+	})
+
+	// These are deliberately placed after the tests of temporary registration,
+	// to demonstrate that (a) they are indeed temporary, and (b) they would
+	// otherwise panic.
+	t.Run("without_registration", func(t *testing.T) {
+		t.Run("payloads", func(t *testing.T) {
+			for pkg, fn := range payloadTests {
+				t.Run(pkg, func(t *testing.T) {
+					require.Panics(t, func() { fn(t) })
+				})
+			}
+		})
+	})
+
+	evm.RegisterAllLibEVMExtras()
+	reRegistered = true
+
+	t.Run("with_permanent_registration", func(t *testing.T) {
+		t.Run("payloads", func(t *testing.T) {
+			for pkg, fn := range payloadTests {
+				t.Run(pkg, fn)
+			}
+		})
+	})
+}
diff --git a/tests/init.go b/tests/init.go
index 2f0149318c..b588e66584 100644
--- a/tests/init.go
+++ b/tests/init.go
@@ -37,13 +37,19 @@ import (
 	"github.com/ava-labs/coreth/params"
 	"github.com/ava-labs/coreth/params/extras"
 	"github.com/ava-labs/coreth/utils"
+	"github.com/ava-labs/libevm/libevm"
 )
 
 // Forks table defines supported forks and their chain config.
 var Forks map[string]*params.ChainConfig
 
 func init() {
-	params.WithTempRegisteredExtras(initializeForks)
+	libevm.WithTemporaryExtrasLock(func(l libevm.ExtrasLock) error {
+		return params.WithTempRegisteredExtras(l, func() error {
+			initializeForks()
+			return nil
+		})
+	})
 }
 
 // initializeForks MUST be called inside [params.WithTempRegisteredExtras] to