diff --git a/go.sum b/go.sum
index 1f3cdfd66b..a5fe34ef46 100644
--- a/go.sum
+++ b/go.sum
@@ -105,6 +105,7 @@ github.com/ethereum/c-kzg-4844 v1.0.0 h1:0X1LBXxaEtYD9xsyj9B9ctQEZIpnvVDeoBx8aHE
 github.com/ethereum/c-kzg-4844 v1.0.0/go.mod h1:VewdlzQmpT5QSrVhbBuGoCdFJkpaJlO1aQputP83wc0=
 github.com/ethereum/go-ethereum v1.14.0 h1:xRWC5NlB6g1x7vNy4HDBLuqVNbtLrc7v8S6+Uxim1LU=
 github.com/ethereum/go-ethereum v1.14.0/go.mod h1:1STrq471D0BQbCX9He0hUj4bHxX2k6mt5nOQJhDNOJ8=
+github.com/ethereum/go-ethereum v1.14.3/go.mod h1:1STrq471D0BQbCX9He0hUj4bHxX2k6mt5nOQJhDNOJ8=
 github.com/fjl/memsize v0.0.2 h1:27txuSD9or+NZlnOWdKUxeBzTAUkWCVh+4Gf2dWFOzA=
 github.com/fjl/memsize v0.0.2/go.mod h1:VvhXpOYNQvB+uIk2RvXzuaQtkQJzzIx6lSBe1xv7hi0=
 github.com/fortytw2/leaktest v1.3.0 h1:u8491cBMTQ8ft8aeV+adlcytMZylmA5nnwwkRZjI8vw=
diff --git a/go/ethadapter/geth_rpc_client.go b/go/ethadapter/geth_rpc_client.go
index 983ab08877..9c9c1e5307 100644
--- a/go/ethadapter/geth_rpc_client.go
+++ b/go/ethadapter/geth_rpc_client.go
@@ -273,6 +273,11 @@ func (e *gethRPCClient) PrepareTransactionToRetry(ctx context.Context, txData ty
 	// prices aren't big enough for float error to matter
 	retryPrice, _ := retryPriceFloat.Int(nil)
 
+	println("from ", from.Hex())
+	println("unEstimatedTx.To() ", unEstimatedTx.To())
+	println("unEstimatedTx.Value() ", unEstimatedTx.Value())
+	println("unEstimatedTx.Data() ", unEstimatedTx.Data())
+
 	gasLimit, err := e.EthClient().EstimateGas(ctx, ethereum.CallMsg{
 		From:  from,
 		To:    unEstimatedTx.To(),
diff --git a/go/wallet/wallet.go b/go/wallet/wallet.go
index 01922ca91b..1b87d46965 100644
--- a/go/wallet/wallet.go
+++ b/go/wallet/wallet.go
@@ -20,8 +20,6 @@ type Wallet interface {
 	Address() common.Address
 	// SignTransaction returns a signed transaction
 	SignTransaction(tx types.TxData) (*types.Transaction, error)
-	SignTransactionForChainID(tx types.TxData, chainID *big.Int) (*types.Transaction, error)
-
 	// SetNonce overrides the current nonce
 	// The GetTransactionCount is expected to be the next nonce to use in a transaction, not the current account GetTransactionCount
 	SetNonce(nonce uint64)
@@ -69,11 +67,7 @@ func NewInMemoryWalletFromConfig(pkStr string, l1ChainID int64, logger gethlog.L
 
 // SignTransaction returns a signed transaction
 func (m *inMemoryWallet) SignTransaction(tx types.TxData) (*types.Transaction, error) {
-	return types.SignNewTx(m.prvKey, types.NewLondonSigner(m.chainID), tx)
-}
-
-func (m *inMemoryWallet) SignTransactionForChainID(tx types.TxData, chainID *big.Int) (*types.Transaction, error) {
-	return types.SignNewTx(m.prvKey, types.NewLondonSigner(chainID), tx)
+	return types.MustSignNewTx(m.prvKey, types.NewCancunSigner(m.chainID), tx), nil
 }
 
 // Address returns the current wallet address
diff --git a/integration/eth2network/eth2_binaries.go b/integration/eth2network/eth2_binaries.go
index 2360a9097f..5ee5f9dd79 100644
--- a/integration/eth2network/eth2_binaries.go
+++ b/integration/eth2network/eth2_binaries.go
@@ -17,7 +17,7 @@ import (
 )
 
 const (
-	_gethVersion  = "1.14.3"
+	_gethVersion  = "1.14.0"
 	_prysmVersion = "v5.0.3"
 )
 
diff --git a/integration/eth2network/eth2_configs.go b/integration/eth2network/eth2_configs.go
index 6f6ec539de..a298d02ab6 100644
--- a/integration/eth2network/eth2_configs.go
+++ b/integration/eth2network/eth2_configs.go
@@ -125,89 +125,20 @@ const _baseGenesis = `{
       		"epoch": 1000
 		}
 	},
-	"nonce": "0x0",
+	"nonce": "0",
 	"timestamp": "0x665a4796",
 	"gasLimit": "0x1c9c380",
-	"difficulty": "0x1",
+	"difficulty": "1",
+	"mixHash":"0x0000000000000000000000000000000000000000000000000000000000000000",
 	"coinbase": "0x0000000000000000000000000000000000000000",
 	"alloc": {
-		"123463a4b065722e99115d6c222f267d9cabb524": {
-			"balance": "0x43c33c1937564800000"
-		},
-		"14dc79964da2c08b23698b3d3cc7ca32193d9955": {
-			"balance": "0x21e19e0c9bab2400000"
-		},
-		"15d34aaf54267db7d7c367839aaf71a00a2c6a65": {
-			"balance": "0x21e19e0c9bab2400000"
-		},
-		"1cbd3b2770909d4e10f157cabc84c7264073c9ec": {
-			"balance": "0x21e19e0c9bab2400000"
-		},
-		"23618e81e3f5cdf7f54c3d65f7fbc0abf5b21e8f": {
-			"balance": "0x21e19e0c9bab2400000"
-		},
-		"2546bcd3c84621e976d8185a91a922ae77ecec30": {
-			"balance": "0x21e19e0c9bab2400000"
-		},
-		"3c44cdddb6a900fa2b585dd299e03d12fa4293bc": {
-			"balance": "0x21e19e0c9bab2400000"
-		},
 		"4242424242424242424242424242424242424242": {
 			"code": "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-			"balance": "0x0"
-		},
-		"4e59b44847b379578588920ca78fbf26c0b4956c": {
-			"code": "0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe03601600081602082378035828234f58015156039578182fd5b8082525050506014600cf3",
-			"balance": "0x0"
-		},
-		"5678e9e827b3be0e3d4b910126a64a697a148267": {
-			"balance": "0x43c33c1937564800000"
-		},
-		"70997970c51812dc3a010c7d01b50e0d17dc79c8": {
-			"balance": "0x21e19e0c9bab2400000"
-		},
-		"71be63f3384f5fb98995898a86b02fb2426c5788": {
-			"balance": "0x21e19e0c9bab2400000"
-		},
-		"8626f6940e2eb28930efb4cef49b2d1f2c9c1199": {
-			"balance": "0x21e19e0c9bab2400000"
-		},
-		"90f79bf6eb2c4f870365e785982e1f101e93b906": {
-			"balance": "0x21e19e0c9bab2400000"
-		},
-		"976ea74026e726554db657fa54763abd0c3a0aa9": {
-			"balance": "0x21e19e0c9bab2400000"
-		},
-		"9965507d1a55bcc2695c58ba16fb37d819b0a4dc": {
-			"balance": "0x21e19e0c9bab2400000"
-		},
-		"a0ee7a142d267c1f36714e4a8f75612f20a79720": {
-			"balance": "0x21e19e0c9bab2400000"
-		},
-		"bcd4042de499d14e55001ccbb24a551f3b954096": {
-			"balance": "0x21e19e0c9bab2400000"
-		},
-		"bda5747bfd65f08deb54cb465eb87d40e51b197e": {
-			"balance": "0x21e19e0c9bab2400000"
-		},
-		"cd3b766ccdd6ae721141f452c550ca635964ce71": {
-			"balance": "0x21e19e0c9bab2400000"
-		},
-		"dd2fd4581271e230360230f9337d5c0430bf44c0": {
-			"balance": "0x21e19e0c9bab2400000"
-		},
-		"df3e18d64bc6a983f673ab319ccae4f1a57c7097": {
-			"balance": "0x21e19e0c9bab2400000"
-		},
-		"f39fd6e51aad88f6f4ce6ab8827279cfffb92266": {
-			"balance": "0x21e19e0c9bab2400000"
-		},
-		"fabb0ac9d68b0b445fb7357272ff202c5651694a": {
-			"balance": "0x21e19e0c9bab2400000"
+			"balance": "0"
 		}
 	},
-	"number": "0x0",
-	"gasUsed": "0x0",
+	"number": "0",
+	"gasUsed": "0",
 	"parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
 	"baseFeePerGas": null,
 	"excessBlobGas": null,
@@ -238,7 +169,13 @@ func generateGenesis(blockTimeSecs int, chainID int, signerAddrs, prefundedAddrs
 	for i := range signerAddrs {
 		signerAddrs[i] = signerAddrs[i][2:]
 	}
-	genesisJSON["extradata"] = fmt.Sprintf("0x000000000000000000000000000000%s0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000", strings.Join(signerAddrs, ""))
+	joinedSigners := strings.Join(signerAddrs, "")
+
+	extraData := fmt.Sprintf("0x%s%s%s",
+		strings.Repeat("0", 64),  // 32 bytes of zeroes
+		joinedSigners,            // Concatenated signer addresses
+		strings.Repeat("0", 130)) // 65 bytes of zeroes
+	genesisJSON["extraData"] = extraData
 
 	genesisBytes, err := json.MarshalIndent(genesisJSON, "", " ")
 	if err != nil {
diff --git a/integration/eth2network/eth2_network.go b/integration/eth2network/eth2_network.go
index 56b788c8ea..0eeac7f824 100644
--- a/integration/eth2network/eth2_network.go
+++ b/integration/eth2network/eth2_network.go
@@ -126,7 +126,8 @@ func NewEth2Network(
 		preFundedMinerPKs[i] = fmt.Sprintf("%x", w.PrivateKey().D.Bytes())
 	}
 	// Generate and write genesis file
-	genesisStr, err := generateGenesis(blockTimeSecs, chainID, preFundedMinerAddrs, append(preFundedAddrs, preFundedMinerAddrs...))
+	addr := append(preFundedAddrs, preFundedMinerAddrs...)
+	genesisStr, err := generateGenesis(blockTimeSecs, chainID, preFundedMinerAddrs, addr)
 	if err != nil {
 		panic(err)
 	}