core/types, params: add InclusionList type

core/types/inclusion_list.go

@@ -0,0 +1,48 @@
+// Copyright 2025 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package types
+
+import (
+	"encoding/json"
+
+	"github.com/ethereum/go-ethereum/common/hexutil"
+)
+
+// InclusionList is a list of transactions that should be included in a payload.
+type InclusionList [][]byte
+
+func (inclusionList InclusionList) MarshalJSON() ([]byte, error) {
+	inclusionListHex := make([]hexutil.Bytes, len(inclusionList))
+	for i, tx := range inclusionList {
+		inclusionListHex[i] = tx
+	}
+	return json.Marshal(inclusionListHex)
+}
+
+func (inclusionList *InclusionList) UnmarshalJSON(input []byte) error {
+	var inclusionListHex []hexutil.Bytes
+	if err := json.Unmarshal(input, &inclusionListHex); err != nil {
+		return err
+	}
+
+	*inclusionList = make([][]byte, len(inclusionListHex))
+	for i, tx := range inclusionListHex {
+		(*inclusionList)[i] = tx
+	}
+
+	return nil
+}

params/protocol_params.go

@@ -137,6 +137,8 @@ const (
 	MaxCodeSize     = 24576           // Maximum bytecode to permit for a contract
 	MaxInitCodeSize = 2 * MaxCodeSize // Maximum initcode to permit in a creation transaction and create instructions
 
+	MaxBytesPerInclusionList uint64 = 8192 // Maximum size in bytes allowed for each inclusion list.
+
 	// Precompiled contract gas prices
 
 	EcrecoverGas        uint64 = 3000 // Elliptic curve sender recovery gas price