fix(genesis): bound consensus params to uint16

scripts/genesis/ProtocolConfig.ts

@@ -44,6 +44,8 @@ const PROTOCOL_CONFIG_CONTROLLER_STORAGE_LOCATION = 0x958f8fec699b51a1249f513ece
 const PAUSABLE_STORAGE_LOCATION = 0x0642d7922329a434cf4fd17a3c95eb692c24fd95f9f94d0b55420a5d895f4a00n
 
 const maxUint64 = 18446744073709551615n
+const maxUint16 = 65535n
+const schemaUint16 = schemaBigInt.min(0n).max(maxUint16)
 
 export const schemaProtocolConfig = z
   .object({
@@ -75,14 +77,14 @@ export const schemaProtocolConfig = z
     }),
     consensusParams: z
       .object({
-        timeoutProposeMs: schemaBigInt,
-        timeoutProposeDeltaMs: schemaBigInt,
-        timeoutPrevoteMs: schemaBigInt,
-        timeoutPrevoteDeltaMs: schemaBigInt,
-        timeoutPrecommitMs: schemaBigInt,
-        timeoutPrecommitDeltaMs: schemaBigInt,
-        timeoutRebroadcastMs: schemaBigInt,
-        targetBlockTimeMs: schemaBigInt,
+        timeoutProposeMs: schemaUint16,
+        timeoutProposeDeltaMs: schemaUint16,
+        timeoutPrevoteMs: schemaUint16,
+        timeoutPrevoteDeltaMs: schemaUint16,
+        timeoutPrecommitMs: schemaUint16,
+        timeoutPrecommitDeltaMs: schemaUint16,
+        timeoutRebroadcastMs: schemaUint16,
+        targetBlockTimeMs: schemaUint16,
       })
       .optional(),
   })

tests/unit/protocol-config-genesis.test.ts

@@ -0,0 +1,82 @@
+// Copyright 2026 Circle Internet Group, Inc. All rights reserved.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import { expect } from 'chai'
+import { schemaProtocolConfig } from '../../scripts/genesis/ProtocolConfig'
+
+const proxyAdmin = '0x0000000000000000000000000000000000000001'
+const owner = '0x0000000000000000000000000000000000000002'
+const controller = '0x0000000000000000000000000000000000000003'
+const pauser = '0x0000000000000000000000000000000000000004'
+
+const validConsensusParams = {
+  timeoutProposeMs: 3000n,
+  timeoutProposeDeltaMs: 500n,
+  timeoutPrevoteMs: 1000n,
+  timeoutPrevoteDeltaMs: 500n,
+  timeoutPrecommitMs: 1000n,
+  timeoutPrecommitDeltaMs: 500n,
+  timeoutRebroadcastMs: 2000n,
+  targetBlockTimeMs: 1000n,
+}
+
+const protocolConfig = {
+  proxy: {
+    admin: proxyAdmin,
+  },
+  owner,
+  controller,
+  pauser,
+  feeParams: {
+    alpha: 1n,
+    kRate: 1n,
+    inverseElasticityMultiplier: 1n,
+    minBaseFee: 0n,
+    maxBaseFee: 1_000_000n,
+    blockGasLimit: 30_000_000n,
+  },
+  consensusParams: validConsensusParams,
+}
+
+describe('ProtocolConfig genesis schema', () => {
+  it('accepts consensusParams at the uint16 upper bound', () => {
+    expect(() =>
+      schemaProtocolConfig.parse({
+        ...protocolConfig,
+        consensusParams: {
+          ...validConsensusParams,
+          timeoutProposeMs: 65535n,
+        },
+      }),
+    ).to.not.throw()
+  })
+
+  it('rejects consensusParams values above the uint16 upper bound', () => {
+    for (const key of Object.keys(validConsensusParams) as Array<keyof typeof validConsensusParams>) {
+      expect(
+        () =>
+          schemaProtocolConfig.parse({
+            ...protocolConfig,
+            consensusParams: {
+              ...validConsensusParams,
+              [key]: 65536n,
+            },
+          }),
+        `${key} should reject 65536`,
+      ).to.throw()
+    }
+  })
+})