diff --git a/clientapi/auth/login_publickey_ethereum.go b/clientapi/auth/login_publickey_ethereum.go
index abf1d2032..1ce41d886 100644
--- a/clientapi/auth/login_publickey_ethereum.go
+++ b/clientapi/auth/login_publickey_ethereum.go
@@ -129,7 +129,7 @@ func (pk LoginPublicKeyEthereum) ValidateLoginResponse() (bool, *jsonerror.Matri
 	}
 
 	// Error if the chainId is not supported by the server.
-	if pk.config.PublicKeyAuthentication.Ethereum.ChainID != message.GetChainID() {
+	if pk.config.PublicKeyAuthentication.Ethereum.GetChainID() != message.GetChainID() {
 		return false, jsonerror.Forbidden("chainId")
 	}
 
diff --git a/clientapi/auth/login_publickey_ethereum_test.go b/clientapi/auth/login_publickey_ethereum_test.go
index a8d3a710a..cd7db05b2 100644
--- a/clientapi/auth/login_publickey_ethereum_test.go
+++ b/clientapi/auth/login_publickey_ethereum_test.go
@@ -18,6 +18,7 @@ import (
 	"context"
 	"fmt"
 	"net/http"
+	"strconv"
 	"strings"
 	"testing"
 
@@ -43,9 +44,9 @@ func createLoginContext(_ *testing.T) *loginContext {
 		PasswordAuthenticationDisabled: true,
 		PublicKeyAuthentication: config.PublicKeyAuthentication{
 			Ethereum: config.EthereumAuthConfig{
-				Enabled: true,
-				Version: 1,
-				ChainID: testutil.EthereumTestNetworkId,
+				Enabled:       true,
+				Version:       1,
+				ConfigChainID: strconv.Itoa(testutil.EthereumTestNetworkId),
 			},
 		},
 	}
diff --git a/clientapi/authorization/authorization.go b/clientapi/authorization/authorization.go
index 3efb37e39..f81513d76 100644
--- a/clientapi/authorization/authorization.go
+++ b/clientapi/authorization/authorization.go
@@ -10,7 +10,7 @@ import (
 
 func NewAuthorization(cfg *config.ClientAPI, rsAPI roomserver.ClientRoomserverAPI) authorization.Authorization {
 	// Load authorization manager for Zion
-	if cfg.PublicKeyAuthentication.Ethereum.EnableAuthz {
+	if cfg.PublicKeyAuthentication.Ethereum.GetEnableAuthZ() {
 		auth, err := zion.NewZionAuthorization(cfg, rsAPI)
 
 		if err != nil {
diff --git a/clientapi/routing/register_publickey_test.go b/clientapi/routing/register_publickey_test.go
index e1a225cbd..961873b89 100644
--- a/clientapi/routing/register_publickey_test.go
+++ b/clientapi/routing/register_publickey_test.go
@@ -19,6 +19,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"net/http"
+	"strconv"
 	"strings"
 	"testing"
 
@@ -48,9 +49,9 @@ func createRegisterContext(_ *testing.T) *registerContext {
 		PasswordAuthenticationDisabled: true,
 		PublicKeyAuthentication: config.PublicKeyAuthentication{
 			Ethereum: config.EthereumAuthConfig{
-				Enabled: true,
-				Version: 1,
-				ChainID: testutil.EthereumTestNetworkId,
+				Enabled:       true,
+				Version:       1,
+				ConfigChainID: strconv.Itoa(testutil.EthereumTestNetworkId),
 			},
 		},
 	}
diff --git a/dendrite-sample.monolith.yaml b/dendrite-sample.monolith.yaml
index 715534528..cbe930c51 100644
--- a/dendrite-sample.monolith.yaml
+++ b/dendrite-sample.monolith.yaml
@@ -179,7 +179,7 @@ client_api:
       enabled: false
       version: 1
       chain_id: 31337
-      networkUrl: "http://127.0.0.1:8545"
+      network_url: "http://127.0.0.1:8545"
 
   # Whether to require reCAPTCHA for registration. If you have enabled registration
   # then this is HIGHLY RECOMMENDED to reduce the risk of your homeserver being used
diff --git a/dendrite-sample.polylith.yaml b/dendrite-sample.polylith.yaml
index 6475fb398..89e272518 100644
--- a/dendrite-sample.polylith.yaml
+++ b/dendrite-sample.polylith.yaml
@@ -175,7 +175,7 @@ client_api:
       enabled: false
       version: 1
       chain_id: 31337
-      networkUrl: "http://127.0.0.1:8545"
+      network_url: "http://127.0.0.1:8545"
 
   # Whether to require reCAPTCHA for registration. If you have enabled registration
   # then this is HIGHLY RECOMMENDED to reduce the risk of your homeserver being used
diff --git a/dendrite-zion.yaml b/dendrite-zion.yaml
index eda51f4d1..da999baa5 100644
--- a/dendrite-zion.yaml
+++ b/dendrite-zion.yaml
@@ -186,9 +186,8 @@ client_api:
     ethereum:
       enabled: true
       version: 1
-      chain_id: 5 
-      deployment_chain_id: ${CHAIN_ID}
-      networkUrl: ${BLOCKCHAIN_PROVIDER_URL}
+      chain_id: ${CHAIN_ID}
+      network_url: ${BLOCKCHAIN_PROVIDER_URL}
       enable_authz: ${ENABLE_AUTHZ}
 
   # Whether to require reCAPTCHA for registration.
diff --git a/setup/config/config.go b/setup/config/config.go
index d30dc4107..dedb5b031 100644
--- a/setup/config/config.go
+++ b/setup/config/config.go
@@ -23,7 +23,6 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
-	"strconv"
 	"strings"
 
 	"github.com/joho/godotenv"
@@ -587,7 +586,9 @@ Replace selected config with environment variables
 */
 
 func (config *Dendrite) replaceWithEnvVariables() {
-	// Replace selected fields with env variables
+	// If env variable is set, get the value from the env
+	// variable and replace it in each supported field.
+
 	err := godotenv.Load(".env")
 	if err != nil {
 		logrus.Errorln("error loading .env file", err)
@@ -604,23 +605,21 @@ func (config *Dendrite) replaceWithEnvVariables() {
 		),
 	)
 
-	// If env variable is set, convert the deployment chain IDs from the env
-	// variable into []int and replace the ChainIDs field.
 	if config.ClientAPI.PublicKeyAuthentication.Ethereum.Enabled {
-		strChainId := replaceWithEnvVariables(config.ClientAPI.PublicKeyAuthentication.Ethereum.DeploymentChainID)
-		if strChainId != "" {
-			id, err := strconv.Atoi(strings.TrimSpace(strChainId))
-			if err == nil {
-				config.ClientAPI.PublicKeyAuthentication.Ethereum.ChainID = id
-			}
-		}
+		config.ClientAPI.PublicKeyAuthentication.Ethereum.ConfigChainID =
+			replaceWithEnvVariables(config.ClientAPI.PublicKeyAuthentication.Ethereum.ConfigChainID)
 
-		config.ClientAPI.PublicKeyAuthentication.Ethereum.NetworkUrl = replaceWithEnvVariables(config.ClientAPI.PublicKeyAuthentication.Ethereum.NetworkUrl)
+		config.ClientAPI.PublicKeyAuthentication.Ethereum.NetworkUrl =
+			replaceWithEnvVariables(config.ClientAPI.PublicKeyAuthentication.Ethereum.NetworkUrl)
+
+		config.ClientAPI.PublicKeyAuthentication.Ethereum.ConfigEnableAuthz =
+			replaceWithEnvVariables(config.ClientAPI.PublicKeyAuthentication.Ethereum.ConfigEnableAuthz)
 
 		logrus.Infof(
-			"Supported Ethereum chain ID=%d, network URL=%s",
-			config.ClientAPI.PublicKeyAuthentication.Ethereum.ChainID,
+			"Supported Ethereum chain_id=%v, network_url=%v, enable_authz=%v",
+			config.ClientAPI.PublicKeyAuthentication.Ethereum.ConfigChainID,
 			config.ClientAPI.PublicKeyAuthentication.Ethereum.NetworkUrl,
+			config.ClientAPI.PublicKeyAuthentication.Ethereum.ConfigEnableAuthz,
 		)
 	}
 }
diff --git a/setup/config/config_publickey.go b/setup/config/config_publickey.go
index 647b648c1..6d73717da 100644
--- a/setup/config/config_publickey.go
+++ b/setup/config/config_publickey.go
@@ -1,6 +1,9 @@
 package config
 
 import (
+	"strconv"
+	"strings"
+
 	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
 )
 
@@ -20,10 +23,37 @@ func (p EthereumAuthParams) GetParams() interface{} {
 type EthereumAuthConfig struct {
 	Enabled           bool   `yaml:"enabled"`
 	Version           uint   `yaml:"version"`
-	ChainID           int    `yaml:"chain_id"`
-	DeploymentChainID string `yaml:"deployment_chain_id"` // For deployment: use env variable string to override the chain ID.
-	NetworkUrl        string `yaml:"networkUrl"`          // Blockchain network provider URL
-	EnableAuthz       bool   `yaml:"enable_authz"`        // Flag to enable / disable authorization during development
+	NetworkUrl        string `yaml:"network_url"`  // Blockchain network provider URL
+	ConfigChainID     string `yaml:"chain_id"`     // Blockchain chain ID. Env variable can replace this property.
+	ConfigEnableAuthz string `yaml:"enable_authz"` // Enable / disable authorization during development. Will be removed when feature is done.
+	chainID           int
+	enableAuthz       bool
+}
+
+func (c *EthereumAuthConfig) GetChainID() int {
+	if c.ConfigChainID != "" {
+		v := strings.TrimSpace(c.ConfigChainID)
+		id, err := strconv.Atoi(v)
+		if err == nil {
+			c.chainID = id
+		}
+		// No need to do this again.
+		c.ConfigChainID = ""
+	}
+	return c.chainID
+}
+
+func (c *EthereumAuthConfig) GetEnableAuthZ() bool {
+	if c.ConfigEnableAuthz != "" {
+		v := strings.TrimSpace(c.ConfigEnableAuthz)
+		boolValue, err := strconv.ParseBool(v)
+		if err == nil {
+			c.enableAuthz = boolValue
+		}
+		// No need to do this again.
+		c.ConfigEnableAuthz = ""
+	}
+	return c.enableAuthz
 }
 
 type PublicKeyAuthentication struct {
@@ -48,7 +78,7 @@ func (pk *PublicKeyAuthentication) GetPublicKeyRegistrationParams() map[string]i
 	if pk.Ethereum.Enabled {
 		p := EthereumAuthParams{
 			Version: pk.Ethereum.Version,
-			ChainID: pk.Ethereum.ChainID,
+			ChainID: pk.Ethereum.GetChainID(),
 		}
 		params[authtypes.LoginTypePublicKeyEthereum] = p
 	}
diff --git a/test/publickey_utils.go b/test/publickey_utils.go
index 497cb7527..0b045c954 100644
--- a/test/publickey_utils.go
+++ b/test/publickey_utils.go
@@ -27,7 +27,7 @@ import (
 	"github.com/spruceid/siwe-go"
 )
 
-const EthereumTestNetworkId = 1337 // Localhost chain ID
+const EthereumTestNetworkId int = 31337 // Localhost chain ID
 const TestServerName = "localhost"
 
 type EthereumTestWallet struct {
diff --git a/zion/zion_authorization.go b/zion/zion_authorization.go
index d009fde94..fbb991a31 100644
--- a/zion/zion_authorization.go
+++ b/zion/zion_authorization.go
@@ -36,7 +36,7 @@ func NewZionAuthorization(
 
 	var auth ZionAuthorization
 
-	auth.chainId = cfg.PublicKeyAuthentication.Ethereum.ChainID
+	auth.chainId = cfg.PublicKeyAuthentication.Ethereum.GetChainID()
 	auth.store = NewStore(rsAPI)
 
 	switch auth.chainId {