diff --git a/tools/generators/ethereum/command.go.tmpl b/tools/generators/ethereum/command.go.tmpl
index beab0e1a..1f2e0f2d 100644
--- a/tools/generators/ethereum/command.go.tmpl
+++ b/tools/generators/ethereum/command.go.tmpl
@@ -204,6 +204,14 @@ func initialize{{.Class}}(c *cli.Context) (*contract.{{.Class}}, error) {
         return nil, fmt.Errorf("error connecting to Ethereum node: [%v]", err)
     }
 
+   	chainID, err := client.ChainID(context.Background())
+	if err != nil {
+		return nil, fmt.Errorf(
+			"failed to resolve Ethereum chain id: [%v]",
+			err,
+		)
+	}
+
     key, err := ethutil.DecryptKeyFile(
         config.Account.KeyFile,
         config.Account.KeyFilePassword,
@@ -239,6 +247,7 @@ func initialize{{.Class}}(c *cli.Context) (*contract.{{.Class}}, error) {
 
     return contract.New{{.Class}}(
         address,
+        chainID,
         key,
         client,
         ethutil.NewNonceManager(key.Address, client),
diff --git a/tools/generators/ethereum/command_template_content.go b/tools/generators/ethereum/command_template_content.go
index f5e09ea1..2c7c3808 100644
--- a/tools/generators/ethereum/command_template_content.go
+++ b/tools/generators/ethereum/command_template_content.go
@@ -207,6 +207,14 @@ func initialize{{.Class}}(c *cli.Context) (*contract.{{.Class}}, error) {
         return nil, fmt.Errorf("error connecting to Ethereum node: [%v]", err)
     }
 
+   	chainID, err := client.ChainID(context.Background())
+	if err != nil {
+		return nil, fmt.Errorf(
+			"failed to resolve Ethereum chain id: [%v]",
+			err,
+		)
+	}
+
     key, err := ethutil.DecryptKeyFile(
         config.Account.KeyFile,
         config.Account.KeyFilePassword,
@@ -242,6 +250,7 @@ func initialize{{.Class}}(c *cli.Context) (*contract.{{.Class}}, error) {
 
     return contract.New{{.Class}}(
         address,
+        chainID,
         key,
         client,
         ethutil.NewNonceManager(key.Address, client),
diff --git a/tools/generators/ethereum/contract.go.tmpl b/tools/generators/ethereum/contract.go.tmpl
index 549db2d4..5bd60425 100644
--- a/tools/generators/ethereum/contract.go.tmpl
+++ b/tools/generators/ethereum/contract.go.tmpl
@@ -13,6 +13,7 @@ import (
 	"github.com/ethereum/go-ethereum/accounts/keystore"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/crypto"
 
 	"github.com/ipfs/go-log"
 
@@ -44,6 +45,7 @@ type {{.Class}} struct {
 
 func New{{.Class}}(
     contractAddress common.Address,
+    chainId *big.Int,
     accountKey *keystore.Key,
     backend bind.ContractBackend,
     nonceManager *ethutil.NonceManager,
@@ -55,9 +57,25 @@ func New{{.Class}}(
 		From: accountKey.Address,
 	}
 
-	transactorOptions := bind.NewKeyedTransactor(
-		accountKey.PrivateKey,
-	)
+	// FIXME Switch to bind.NewKeyedTransactorWithChainID when go-ethereum dep
+	// FIXME bumps beyond 1.9.25.
+	key := accountKey.PrivateKey
+	keyAddress := crypto.PubkeyToAddress(key.PublicKey)
+	transactorOptions := &bind.TransactOpts{
+		From: keyAddress,
+		Signer: func(_ types.Signer, address common.Address, tx *types.Transaction) (*types.Transaction, error) {
+			signer := types.NewEIP155Signer(chainId)
+
+			if address != keyAddress {
+				return nil, fmt.Errorf("not authorized to sign this account")
+			}
+			signature, err := crypto.Sign(signer.Hash(tx).Bytes(), key)
+			if err != nil {
+				return nil, err
+			}
+			return tx.WithSignature(signer, signature)
+		},
+	}
 
 	randomBeaconContract, err := abi.New{{.AbiClass}}(
 		contractAddress,
diff --git a/tools/generators/ethereum/contract_template_content.go b/tools/generators/ethereum/contract_template_content.go
index 34f016de..1bc72e17 100644
--- a/tools/generators/ethereum/contract_template_content.go
+++ b/tools/generators/ethereum/contract_template_content.go
@@ -16,6 +16,7 @@ import (
 	"github.com/ethereum/go-ethereum/accounts/keystore"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/crypto"
 
 	"github.com/ipfs/go-log"
 
@@ -47,6 +48,7 @@ type {{.Class}} struct {
 
 func New{{.Class}}(
     contractAddress common.Address,
+    chainId *big.Int,
     accountKey *keystore.Key,
     backend bind.ContractBackend,
     nonceManager *ethutil.NonceManager,
@@ -58,9 +60,25 @@ func New{{.Class}}(
 		From: accountKey.Address,
 	}
 
-	transactorOptions := bind.NewKeyedTransactor(
-		accountKey.PrivateKey,
-	)
+	// FIXME Switch to bind.NewKeyedTransactorWithChainID when go-ethereum dep
+	// FIXME bumps beyond 1.9.25.
+	key := accountKey.PrivateKey
+	keyAddress := crypto.PubkeyToAddress(key.PublicKey)
+	transactorOptions := &bind.TransactOpts{
+		From: keyAddress,
+		Signer: func(_ types.Signer, address common.Address, tx *types.Transaction) (*types.Transaction, error) {
+			signer := types.NewEIP155Signer(chainId)
+
+			if address != keyAddress {
+				return nil, fmt.Errorf("not authorized to sign this account")
+			}
+			signature, err := crypto.Sign(signer.Hash(tx).Bytes(), key)
+			if err != nil {
+				return nil, err
+			}
+			return tx.WithSignature(signer, signature)
+		},
+	}
 
 	randomBeaconContract, err := abi.New{{.AbiClass}}(
 		contractAddress,