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account_proof.go
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account_proof.go
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package eth
import (
"bytes"
"fmt"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/ethdb/memorydb"
"github.com/ethereum/go-ethereum/rlp"
"github.com/ethereum/go-ethereum/trie"
)
type StorageProofEntry struct {
Key common.Hash `json:"key"`
Value hexutil.Big `json:"value"`
Proof []hexutil.Bytes `json:"proof"`
}
type AccountResult struct {
AccountProof []hexutil.Bytes `json:"accountProof"`
Address common.Address `json:"address"`
Balance *hexutil.Big `json:"balance"`
CodeHash common.Hash `json:"codeHash"`
Nonce hexutil.Uint64 `json:"nonce"`
StorageHash common.Hash `json:"storageHash"`
// Optional
StorageProof []StorageProofEntry `json:"storageProof,omitempty"`
}
// Verify an account (and optionally storage) proof from the getProof RPC. See https://eips.ethereum.org/EIPS/eip-1186
func (res *AccountResult) Verify(stateRoot common.Hash) error {
// verify storage proof values, if any, against the storage trie root hash of the account
for i, entry := range res.StorageProof {
// load all MPT nodes into a DB
db := memorydb.New()
for j, encodedNode := range entry.Proof {
nodeKey := encodedNode
if len(encodedNode) >= 32 { // small MPT nodes are not hashed
nodeKey = crypto.Keccak256(encodedNode)
}
if err := db.Put(nodeKey, encodedNode); err != nil {
return fmt.Errorf("failed to load storage proof node %d of storage value %d into mem db: %w", j, i, err)
}
}
path := crypto.Keccak256(entry.Key[:])
val, err := trie.VerifyProof(res.StorageHash, path, db)
if err != nil {
return fmt.Errorf("failed to verify storage value %d with key %s (path %x) in storage trie %s: %w", i, entry.Key, path, res.StorageHash, err)
}
comparison, err := rlp.EncodeToBytes(entry.Value.ToInt().Bytes())
if err != nil {
return fmt.Errorf("failed to encode storage value %d with key %s (path %x) in storage trie %s: %w", i, entry.Key, path, res.StorageHash, err)
}
if !bytes.Equal(val, comparison) {
return fmt.Errorf("value %d in storage proof does not match proven value at key %s (path %x)", i, entry.Key, path)
}
}
accountClaimed := []any{uint64(res.Nonce), res.Balance.ToInt().Bytes(), res.StorageHash, res.CodeHash}
accountClaimedValue, err := rlp.EncodeToBytes(accountClaimed)
if err != nil {
return fmt.Errorf("failed to encode account from retrieved values: %w", err)
}
// create a db with all account trie nodes
db := memorydb.New()
for i, encodedNode := range res.AccountProof {
nodeKey := encodedNode
if len(encodedNode) >= 32 { // small MPT nodes are not hashed
nodeKey = crypto.Keccak256(encodedNode)
}
if err := db.Put(nodeKey, encodedNode); err != nil {
return fmt.Errorf("failed to load account proof node %d into mem db: %w", i, err)
}
}
path := crypto.Keccak256(res.Address[:])
accountProofValue, err := trie.VerifyProof(stateRoot, path, db)
if err != nil {
return fmt.Errorf("failed to verify account value with key %s (path %x) in account trie %s: %w", res.Address, path, stateRoot, err)
}
if !bytes.Equal(accountClaimedValue, accountProofValue) {
return fmt.Errorf("L1 RPC is tricking us, account proof does not match provided deserialized values:\n"+
" claimed: %x\n"+
" proof: %x", accountClaimedValue, accountProofValue)
}
return err
}