diff --git a/shared/featureconfig/config.go b/shared/featureconfig/config.go
index 7e240f726d..09d7ebe1d0 100644
--- a/shared/featureconfig/config.go
+++ b/shared/featureconfig/config.go
@@ -32,11 +32,6 @@ var log = logrus.WithField("prefix", "flags")
 // Flags is a struct to represent which features the client will perform on runtime.
 type Flags struct {
 	// Testnet Flags.
-	AltonaTestnet  bool // AltonaTestnet defines the flag through which we can enable the node to run on the Altona testnet.
-	OnyxTestnet    bool // OnyxTestnet defines the flag through which we can enable the node to run on the Onyx testnet.
-	MedallaTestnet bool // MedallaTestnet defines the flag through which we can enable the node to run on the Medalla testnet.
-	SpadinaTestnet bool // SpadinaTestnet defines the flag through which we can enable the node to run on the Spadina testnet.
-	ZinkenTestnet  bool // ZinkenTestnet defines the flag through which we can enable the node to run on the Zinken testnet.
 	ToledoTestnet  bool // ToledoTestnet defines the flag through which we can enable the node to run on the Toledo testnet.
 	PyrmontTestnet bool // PyrmontTestnet defines the flag through which we can enable the node to run on the Pyrmont testnet.
 
@@ -110,32 +105,7 @@ func InitWithReset(c *Flags) func() {
 
 // configureTestnet sets the config according to specified testnet flag
 func configureTestnet(ctx *cli.Context, cfg *Flags) {
-	if ctx.Bool(AltonaTestnet.Name) {
-		log.Warn("Running on Altona Testnet")
-		params.UseAltonaConfig()
-		params.UseAltonaNetworkConfig()
-		cfg.AltonaTestnet = true
-	} else if ctx.Bool(OnyxTestnet.Name) {
-		log.Warn("Running on Onyx Testnet")
-		params.UseOnyxConfig()
-		params.UseOnyxNetworkConfig()
-		cfg.OnyxTestnet = true
-	} else if ctx.Bool(MedallaTestnet.Name) {
-		log.Warn("Running on Medalla Testnet")
-		params.UseMedallaConfig()
-		params.UseMedallaNetworkConfig()
-		cfg.MedallaTestnet = true
-	} else if ctx.Bool(SpadinaTestnet.Name) {
-		log.Warn("Running on Spadina Testnet")
-		params.UseSpadinaConfig()
-		params.UseSpadinaNetworkConfig()
-		cfg.SpadinaTestnet = true
-	} else if ctx.Bool(ZinkenTestnet.Name) {
-		log.Warn("Running on Zinken Testnet")
-		params.UseZinkenConfig()
-		params.UseZinkenNetworkConfig()
-		cfg.ZinkenTestnet = true
-	} else if ctx.Bool(ToledoTestnet.Name) {
+	if ctx.Bool(ToledoTestnet.Name) {
 		log.Warn("Running on Toledo Testnet")
 		params.UseToledoConfig()
 		params.UseToledoNetworkConfig()
diff --git a/shared/featureconfig/config_test.go b/shared/featureconfig/config_test.go
index 699d9efb71..d18e3bc803 100644
--- a/shared/featureconfig/config_test.go
+++ b/shared/featureconfig/config_test.go
@@ -11,44 +11,44 @@ import (
 func TestInitFeatureConfig(t *testing.T) {
 	defer Init(&Flags{})
 	cfg := &Flags{
-		MedallaTestnet: true,
+		PyrmontTestnet: true,
 	}
 	Init(cfg)
 	c := Get()
-	assert.Equal(t, true, c.MedallaTestnet)
+	assert.Equal(t, true, c.PyrmontTestnet)
 
 	// Reset back to false for the follow up tests.
-	cfg = &Flags{MedallaTestnet: false}
+	cfg = &Flags{PyrmontTestnet: false}
 	Init(cfg)
 }
 
 func TestInitWithReset(t *testing.T) {
 	defer Init(&Flags{})
 	Init(&Flags{
-		OnyxTestnet: true,
+		PyrmontTestnet: true,
 	})
-	assert.Equal(t, false, Get().AltonaTestnet)
-	assert.Equal(t, true, Get().OnyxTestnet)
+	assert.Equal(t, false, Get().ToledoTestnet)
+	assert.Equal(t, true, Get().PyrmontTestnet)
 
 	// Overwrite previously set value (value that didn't come by default).
 	resetCfg := InitWithReset(&Flags{
-		OnyxTestnet: false,
+		PyrmontTestnet: false,
 	})
-	assert.Equal(t, false, Get().AltonaTestnet)
-	assert.Equal(t, false, Get().OnyxTestnet)
+	assert.Equal(t, false, Get().ToledoTestnet)
+	assert.Equal(t, false, Get().PyrmontTestnet)
 
 	// Reset must get to previously set configuration (not to default config values).
 	resetCfg()
-	assert.Equal(t, false, Get().AltonaTestnet)
-	assert.Equal(t, true, Get().OnyxTestnet)
+	assert.Equal(t, false, Get().ToledoTestnet)
+	assert.Equal(t, true, Get().PyrmontTestnet)
 }
 
 func TestConfigureBeaconConfig(t *testing.T) {
 	app := cli.App{}
 	set := flag.NewFlagSet("test", 0)
-	set.Bool(MedallaTestnet.Name, true, "test")
+	set.Bool(PyrmontTestnet.Name, true, "test")
 	context := cli.NewContext(&app, set, nil)
 	ConfigureBeaconChain(context)
 	c := Get()
-	assert.Equal(t, true, c.MedallaTestnet)
+	assert.Equal(t, true, c.PyrmontTestnet)
 }
diff --git a/shared/featureconfig/flags.go b/shared/featureconfig/flags.go
index c409beab87..50025c0dc8 100644
--- a/shared/featureconfig/flags.go
+++ b/shared/featureconfig/flags.go
@@ -5,21 +5,6 @@ import (
 )
 
 var (
-	// AltonaTestnet flag for the multiclient eth2 testnet configuration.
-	AltonaTestnet = &cli.BoolFlag{
-		Name:  "altona",
-		Usage: "This defines the flag through which we can run on the Altona Multiclient Testnet",
-	}
-	// OnyxTestnet flag for the Prysmatic Labs single-client testnet configuration.
-	OnyxTestnet = &cli.BoolFlag{
-		Name:  "onyx",
-		Usage: "This defines the flag through which we can run on the Onyx Prysm Testnet",
-	}
-	// MedallaTestnet flag for the multiclient eth2 testnet.
-	MedallaTestnet = &cli.BoolFlag{
-		Name:  "medalla",
-		Usage: "This defines the flag through which we can run on the Medalla Multiclient Testnet",
-	}
 	// ToledoTestnet flag for the multiclient eth2 testnet.
 	ToledoTestnet = &cli.BoolFlag{
 		Name:  "toledo",
@@ -30,16 +15,6 @@ var (
 		Name:  "pyrmont",
 		Usage: "This defines the flag through which we can run on the Pyrmont Multiclient Testnet",
 	}
-	// SpadinaTestnet flag for the multiclient eth2 testnet.
-	SpadinaTestnet = &cli.BoolFlag{
-		Name:  "spadina",
-		Usage: "This defines the flag through which we can run on the Spadina Multiclient Testnet",
-	}
-	// ZinkenTestnet flag for the multiclient eth2 testnet.
-	ZinkenTestnet = &cli.BoolFlag{
-		Name:  "zinken",
-		Usage: "This defines the flag through which we can run on the Zinken Multiclient Testnet",
-	}
 	// Mainnet flag for easier tooling, no-op
 	Mainnet = &cli.BoolFlag{
 		Value: true,
@@ -120,12 +95,7 @@ var devModeFlags = []cli.Flag{
 var ValidatorFlags = append(deprecatedFlags, []cli.Flag{
 	enableExternalSlasherProtectionFlag,
 	waitForSyncedFlag,
-	AltonaTestnet,
-	OnyxTestnet,
-	MedallaTestnet,
 	ToledoTestnet,
-	SpadinaTestnet,
-	ZinkenTestnet,
 	PyrmontTestnet,
 	Mainnet,
 	disableAccountsV2,
@@ -135,12 +105,7 @@ var ValidatorFlags = append(deprecatedFlags, []cli.Flag{
 // SlasherFlags contains a list of all the feature flags that apply to the slasher client.
 var SlasherFlags = append(deprecatedFlags, []cli.Flag{
 	disableLookbackFlag,
-	AltonaTestnet,
-	OnyxTestnet,
-	MedallaTestnet,
 	ToledoTestnet,
-	SpadinaTestnet,
-	ZinkenTestnet,
 	PyrmontTestnet,
 	Mainnet,
 }...)
@@ -158,12 +123,7 @@ var BeaconChainFlags = append(deprecatedFlags, []cli.Flag{
 	waitForSyncedFlag,
 	disableGRPCConnectionLogging,
 	attestationAggregationStrategy,
-	AltonaTestnet,
-	OnyxTestnet,
-	MedallaTestnet,
 	ToledoTestnet,
-	SpadinaTestnet,
-	ZinkenTestnet,
 	PyrmontTestnet,
 	Mainnet,
 	enableBlst,
diff --git a/shared/params/BUILD.bazel b/shared/params/BUILD.bazel
index b9d671d8a0..1f11f479a6 100644
--- a/shared/params/BUILD.bazel
+++ b/shared/params/BUILD.bazel
@@ -10,14 +10,9 @@ go_library(
         "mainnet_config.go",
         "minimal_config.go",
         "network_config.go",
-        "testnet_altona_config.go",
         "testnet_e2e_config.go",
-        "testnet_medalla_config.go",
-        "testnet_onyx_config.go",
         "testnet_pyrmont_config.go",
-        "testnet_spadina_config.go",
         "testnet_toledo_config.go",
-        "testnet_zinken_config.go",
         "testutils.go",
     ],
     importpath = "github.com/prysmaticlabs/prysm/shared/params",
diff --git a/shared/params/testnet_altona_config.go b/shared/params/testnet_altona_config.go
deleted file mode 100644
index c86f9d0359..0000000000
--- a/shared/params/testnet_altona_config.go
+++ /dev/null
@@ -1,41 +0,0 @@
-package params
-
-// UseAltonaNetworkConfig uses the Altona specific
-// network config.
-func UseAltonaNetworkConfig() {
-	cfg := BeaconNetworkConfig().Copy()
-	cfg.ContractDeploymentBlock = 2917810
-	cfg.DepositContractAddress = "0x16e82D77882A663454Ef92806b7DeCa1D394810f"
-	cfg.ChainID = 5   // Chain ID of eth1 goerli testnet.
-	cfg.NetworkID = 5 // Network ID of eth1 goerli testnet.
-	cfg.BootstrapNodes = []string{
-		"enr:-LK4QFtV7Pz4reD5a7cpfi1z6yPrZ2I9eMMU5mGQpFXLnLoKZW8TXvVubShzLLpsEj6aayvVO1vFx-MApijD3HLPhlECh2F0dG5ldHOIAAAAAAAAAACEZXRoMpD6etXjAAABIf__________gmlkgnY0gmlwhDMPYfCJc2VjcDI1NmsxoQIerw_qBc9apYfZqo2awiwS930_vvmGnW2psuHsTzrJ8YN0Y3CCIyiDdWRwgiMo",
-		"enr:-LK4QPVkFd_MKzdW0219doTZryq40tTe8rwWYO75KDmeZM78fBskGsfCuAww9t8y3u0Q0FlhXOhjE1CWpx3SGbUaU80Ch2F0dG5ldHOIAAAAAAAAAACEZXRoMpD6etXjAAABIf__________gmlkgnY0gmlwhDMPRgeJc2VjcDI1NmsxoQNHu-QfNgzl8VxbMiPgv6wgAljojnqAOrN18tzJMuN8oYN0Y3CCIyiDdWRwgiMo",
-		"enr:-LK4QHe52XPPrcv6-MvcmN5GqDe_sgCwo24n_2hedlfwD_oxNt7cXL3tXJ7h9aYv6CTS1C_H2G2_dkeqm_LBO9nrpiYBh2F0dG5ldHOIAAAAAAAAAACEZXRoMpD9yjmwAAABIf__________gmlkgnY0gmlwhANzD9uJc2VjcDI1NmsxoQJX7zMnRU3szfGfS8MAIfPaQKOBpu3sBVTXf4Qq0b_m-4N0Y3CCIyiDdWRwgiMo",
-		"enr:-LK4QLkbbq7xuRa_EnWd_kc0TkQk0pd0B0cZYR5LvBsncFQBDyPbGdy8d24TzRVeK7ZWwM5_2EcSJK223f8TYUOQYfwBh2F0dG5ldHOIAAAAAAAAAACEZXRoMpD9yjmwAAABIf__________gmlkgnY0gmlwhAPsjtOJc2VjcDI1NmsxoQJNw_aZgWXl2SstD--WAjooGudjWLjEbbCIddJuEPxzWYN0Y3CCIyiDdWRwgiMo",
-		"enr:-LK4QHy-glnxN1WTk5f6d7-xXwy_UKJLs5k7p_S4KRY9I925KTzW_kQLjfFriIpH0de7kygBwrSl726ukq9_OG_sgKMCh2F0dG5ldHOIUjEAIQEAFMiEZXRoMpD9yjmwAAABIf__________gmlkgnY0gmlwhBLmhrCJc2VjcDI1NmsxoQNlU7gT0HUvpLA41n-P5GrCgjwMwtG02YsRRO0lAmpmBYN0Y3CCIyiDdWRwgiMo",
-		"enr:-LK4QDz0n0vpyOpuStB8e22h9ayHVcvmN7o0trC7eC0DnZV9GYGzK5uKv7WlzpMQM2nDTG43DWvF_DZYwJOZCbF4iCQBh2F0dG5ldHOI__________-EZXRoMpD9yjmwAAABIf__________gmlkgnY0gmlwhBKN136Jc2VjcDI1NmsxoQP5gcOUcaruHuMuTv8ht7ZEawp3iih7CmeLqcoY1hxOnoN0Y3CCIyiDdWRwgiMo",
-		"enr:-LK4QOScOZ35sOXEH6CEW15lfv7I3DhqQAzCPQ_nRav95otuSh4yi9ol0AruKDiIk9qqGXyD-wQDaBAPLhwl4t-rUSQBh2F0dG5ldHOI__________-EZXRoMpD9yjmwAAABIf__________gmlkgnY0gmlwhCL68KuJc2VjcDI1NmsxoQK5fYR3Ipoc01dz0d2-EcL7m26zKQSkAbf4rwcMMM09CoN0Y3CCIyiDdWRwgiMo",
-		"enr:-Ku4QMqmWPFkgM58F16wxB50cqWDaWaIsyANHL8wUNSB4Cy1TP9__uJQNRODvx_dvO6rY-BT3psrYTMAaxnMGXb6DuoBh2F0dG5ldHOIAAAAAAAAAACEZXRoMpD1pf1CAAAAAP__________gmlkgnY0gmlwhBLf22SJc2VjcDI1NmsxoQNoed9JnQh7ltcAacHEGOjwocL1BhMQbYTgaPX0kFuXtIN1ZHCCE4g",
-	}
-
-	OverrideBeaconNetworkConfig(cfg)
-}
-
-// UseAltonaConfig sets the main beacon chain
-// config for altona.
-func UseAltonaConfig() {
-	beaconConfig = AltonaConfig()
-}
-
-// AltonaConfig defines the config for the
-// altona testnet.
-func AltonaConfig() *BeaconChainConfig {
-	altCfg := MainnetConfig().Copy()
-	altCfg.MinGenesisActiveValidatorCount = 640
-	altCfg.MinGenesisTime = 1593433800
-	altCfg.GenesisForkVersion = []byte{0x00, 0x00, 0x01, 0x21}
-	altCfg.NetworkName = "Altona"
-	altCfg.SecondsPerETH1Block = 14
-	return altCfg
-}
diff --git a/shared/params/testnet_medalla_config.go b/shared/params/testnet_medalla_config.go
deleted file mode 100644
index 14c8c9cdaf..0000000000
--- a/shared/params/testnet_medalla_config.go
+++ /dev/null
@@ -1,40 +0,0 @@
-package params
-
-// UseMedallaNetworkConfig uses the Medalla specific
-// network config.
-func UseMedallaNetworkConfig() {
-	cfg := BeaconNetworkConfig().Copy()
-	cfg.ContractDeploymentBlock = 3085928
-	cfg.DepositContractAddress = "0x07b39F4fDE4A38bACe212b546dAc87C58DfE3fDC"
-	cfg.ChainID = 5   // Chain ID of eth1 goerli testnet.
-	cfg.NetworkID = 5 // Network ID of eth1 goerli testnet.
-	// Medalla Bootstrap Nodes
-	cfg.BootstrapNodes = []string{
-		// Prylabs Bootnodes
-		"enr:-Ku4QOnVSyvzS3VbF87J8MubaRuTyfPi6B67XQg6-5eAV_uILAhn9geTTQmfqDIOcIeAxWHUUajQp6lYniAXPWncp6UBh2F0dG5ldHOIAAAAAAAAAACEZXRoMpAYrkzLAAAAAf__________gmlkgnY0gmlwhBLf22SJc2VjcDI1NmsxoQKekYKqUtwbaJKKCct_srE5-g7tBUm68mj_jpeSb7CCqYN1ZHCCC7g",
-		"enr:-Ku4QOdk3u7rXI5YvqwmEbApW_OLlRkq_yzmmhdlrJMcfviacLWwSm-tr1BOvamuRQqfc6lnMeec4E4ddOhd3KqCB98Bh2F0dG5ldHOIAAAAAAAAAACEZXRoMpAYrkzLAAAAAf__________gmlkgnY0gmlwhBLf22SJc2VjcDI1NmsxoQKH3lxnglLqrA7L6sl5r7XFnckr3XCnlZMaBTYSdE8SHIN1ZHCCG1g",
-		"enr:-Ku4QHWezvidY_m0dWEwERrNrqjEQWrlIx7b8K4EIxGgTrLmUxHCZPW5-t8PsS8nFxAJ8k8YacKP5zPRk5gbsTSsRTQBh2F0dG5ldHOIAAAAAAAAAACEZXRoMpAYrkzLAAAAAf__________gmlkgnY0gmlwhBLf22SJc2VjcDI1NmsxoQMypP_ODwTuBq2v0oIdjPGCEyu9Hb_jHDbuIX_iNvBRGoN1ZHCCGWQ",
-		// External Bootnodes
-		"enr:-Ku4QFVactU18ogiqPPasKs3jhUm5ISszUrUMK2c6SUPbGtANXVJ2wFapsKwVEVnVKxZ7Gsr9yEc4PYF-a14ahPa1q0Bh2F0dG5ldHOIAAAAAAAAAACEZXRoMpAYrkzLAAAAAf__________gmlkgnY0gmlwhGQbAHyJc2VjcDI1NmsxoQILF-Ya2i5yowVkQtlnZLjG0kqC4qtwmSk8ha7tKLuME4N1ZHCCIyg",
-		"enr:-KG4QFuKQ9eeXDTf8J4tBxFvs3QeMrr72mvS7qJgL9ieO6k9Rq5QuGqtGK4VlXMNHfe34Khhw427r7peSoIbGcN91fUDhGV0aDKQD8XYjwAAAAH__________4JpZIJ2NIJpcIQDhMExiXNlY3AyNTZrMaEDESplmV9c2k73v0DjxVXJ6__2bWyP-tK28_80lf7dUhqDdGNwgiMog3VkcIIjKA",
-	}
-
-	OverrideBeaconNetworkConfig(cfg)
-}
-
-// MedallaConfig defines the config for the
-// medalla testnet.
-func MedallaConfig() *BeaconChainConfig {
-	cfg := MainnetConfig().Copy()
-	cfg.MinGenesisTime = 1596546000
-	cfg.GenesisForkVersion = []byte{0x00, 0x00, 0x00, 0x01}
-	cfg.NetworkName = "Medalla"
-	cfg.SecondsPerETH1Block = 14
-	return cfg
-}
-
-// UseMedallaConfig sets the main beacon chain
-// config for medalla.
-func UseMedallaConfig() {
-	beaconConfig = MedallaConfig()
-}
diff --git a/shared/params/testnet_onyx_config.go b/shared/params/testnet_onyx_config.go
deleted file mode 100644
index bce7d408a3..0000000000
--- a/shared/params/testnet_onyx_config.go
+++ /dev/null
@@ -1,18 +0,0 @@
-package params
-
-// UseOnyxNetworkConfig uses the Onyx specific network config.
-func UseOnyxNetworkConfig() {
-	cfg := BeaconNetworkConfig().Copy()
-	cfg.ContractDeploymentBlock = 2844925
-	cfg.DepositContractAddress = "0x0F0F0fc0530007361933EaB5DB97d09aCDD6C1c8"
-	cfg.ChainID = 5   // Chain ID of eth1 goerli testnet.
-	cfg.NetworkID = 5 // Network ID of eth1 goerli testnet.
-	cfg.BootstrapNodes = []string{"enr:-Ku4QMKVC_MowDsmEa20d5uGjrChI0h8_KsKXDmgVQbIbngZV0idV6_RL7fEtZGo-kTNZ5o7_EJI_vCPJ6scrhwX0Z4Bh2F0dG5ldHOIAAAAAAAAAACEZXRoMpD1pf1CAAAAAP__________gmlkgnY0gmlwhBLf22SJc2VjcDI1NmsxoQJxCnE6v_x2ekgY_uoE1rtwzvGy40mq9eD66XfHPBWgIIN1ZHCCD6A"}
-	OverrideBeaconNetworkConfig(cfg)
-}
-
-// UseOnyxConfig for beacon chain services. Currently, Onyx uses the unchanged mainnet
-// configuration.
-func UseOnyxConfig() {
-	beaconConfig = MainnetConfig().Copy()
-}
diff --git a/shared/params/testnet_spadina_config.go b/shared/params/testnet_spadina_config.go
deleted file mode 100644
index 69b3819ee2..0000000000
--- a/shared/params/testnet_spadina_config.go
+++ /dev/null
@@ -1,36 +0,0 @@
-package params
-
-// UseSpadinaNetworkConfig uses the Spadina specific
-// network config.
-func UseSpadinaNetworkConfig() {
-	cfg := BeaconNetworkConfig().Copy()
-	cfg.ContractDeploymentBlock = 3384340
-	cfg.ChainID = 5
-	cfg.NetworkID = 5
-	cfg.DepositContractAddress = "0x48B597F4b53C21B48AD95c7256B49D1779Bd5890"
-	cfg.BootstrapNodes = []string{
-		// Prysm Bootnode 1
-		"enr:-Ku4QGQJf2bcDAwVGvbvtq3AB4KKwAvStTenY-i_QnW2ABNRRBncIU_5qR_e_um-9t3s9g-Y5ZfFATj1nhtzq6lvgc4Bh2F0dG5ldHOIAAAAAAAAAACEZXRoMpDEqCQNAAAAAv__________gmlkgnY0gmlwhBLf22SJc2VjcDI1NmsxoQNoed9JnQh7ltcAacHEGOjwocL1BhMQbYTgaPX0kFuXtIN1ZHCCE4g",
-		// Teku Bootnode 1
-		"enr:-KG4QA-EcFfXQsL2dcneG8vp8HTWLrpwHQ5HhfyIytfpeKOISzROy2kYSsf_v-BZKnIx5XHDjqJ-ttz0hoz6qJA7tasEhGV0aDKQxKgkDQAAAAL__________4JpZIJ2NIJpcIQDFt-UiXNlY3AyNTZrMaECkR4C5DVO_9rB48eHTY4kdyOHsguTEDlvb7Ce0_mvghSDdGNwgiMog3VkcIIjKA",
-	}
-	OverrideBeaconNetworkConfig(cfg)
-}
-
-// UseSpadinaConfig sets the main beacon chain
-// config for Spadina.
-func UseSpadinaConfig() {
-	beaconConfig = SpadinaConfig()
-}
-
-// SpadinaConfig defines the config for the
-// Spadina testnet.
-func SpadinaConfig() *BeaconChainConfig {
-	cfg := MainnetConfig().Copy()
-	cfg.MinGenesisTime = 1601380800
-	cfg.GenesisForkVersion = []byte{0x00, 0x00, 0x00, 0x02}
-	cfg.NetworkName = "Spadina"
-	cfg.MinGenesisActiveValidatorCount = 1024
-	cfg.SecondsPerETH1Block = 14
-	return cfg
-}
diff --git a/shared/params/testnet_zinken_config.go b/shared/params/testnet_zinken_config.go
deleted file mode 100644
index 00332831fd..0000000000
--- a/shared/params/testnet_zinken_config.go
+++ /dev/null
@@ -1,35 +0,0 @@
-package params
-
-// UseZinkenNetworkConfig uses the Zinken specific
-// network config.
-func UseZinkenNetworkConfig() {
-	cfg := BeaconNetworkConfig().Copy()
-	cfg.ContractDeploymentBlock = 3488417
-	cfg.ChainID = 5
-	cfg.NetworkID = 5
-	cfg.DepositContractAddress = "0x99F0Ec06548b086E46Cb0019C78D0b9b9F36cD53"
-	cfg.BootstrapNodes = []string{
-		// Prysm Bootnode 1
-		"enr:-Ku4QH63huZ12miIY0kLI9dunG5fwKpnn-zR3XyA_kH6rQpRD1VoyLyzIcFysCJ09JDprdX-EzXp-Nc8swYqBznkXggBh2F0dG5ldHOIAAAAAAAAAACEZXRoMpDaNQiCAAAAA___________gmlkgnY0gmlwhBLf22SJc2VjcDI1NmsxoQILqxBY-_SF8o_5FjFD3yM92s50zT_ciFi8hStde5AEjIN1ZHCCH0A",
-	}
-	OverrideBeaconNetworkConfig(cfg)
-}
-
-// UseZinkenConfig sets the main beacon chain
-// config for Zinken.
-func UseZinkenConfig() {
-	beaconConfig = ZinkenConfig()
-}
-
-// ZinkenConfig defines the config for the
-// Zinken testnet.
-func ZinkenConfig() *BeaconChainConfig {
-	cfg := MainnetConfig().Copy()
-	cfg.MinGenesisTime = 1602504000
-	cfg.GenesisDelay = 345600
-	cfg.GenesisForkVersion = []byte{0x00, 0x00, 0x00, 0x03}
-	cfg.NetworkName = "zinken"
-	cfg.MinGenesisActiveValidatorCount = 1024
-	cfg.SecondsPerETH1Block = 14
-	return cfg
-}
diff --git a/tools/bootnode/bootnode.go b/tools/bootnode/bootnode.go
index eb751676b1..dac0860f98 100644
--- a/tools/bootnode/bootnode.go
+++ b/tools/bootnode/bootnode.go
@@ -67,7 +67,7 @@ type handler struct {
 
 func main() {
 	// Using Medalla as the default configuration.
-	params.UseMedallaConfig()
+	params.UsePyrmontConfig()
 
 	flag.Parse()
 
diff --git a/tools/cluster-pk-manager/client/main.go b/tools/cluster-pk-manager/client/main.go
index 3abfbdf32d..6fd8879811 100644
--- a/tools/cluster-pk-manager/client/main.go
+++ b/tools/cluster-pk-manager/client/main.go
@@ -32,8 +32,7 @@ type UnencryptedKeys struct {
 }
 
 func main() {
-	// Using Medalla as the default configuration.
-	params.UseMedallaConfig()
+	params.UsePyrmontConfig()
 
 	flag.Parse()
 
diff --git a/tools/cluster-pk-manager/server/main.go b/tools/cluster-pk-manager/server/main.go
index a8d8971ed9..4cc88dc61a 100644
--- a/tools/cluster-pk-manager/server/main.go
+++ b/tools/cluster-pk-manager/server/main.go
@@ -29,8 +29,7 @@ var (
 )
 
 func main() {
-	// Using Medalla as the default configuration.
-	params.UseMedallaConfig()
+	params.UsePyrmontConfig()
 
 	flag.Parse()
 	if *verbose {
diff --git a/tools/sendDepositTx/sendDeposits.go b/tools/sendDepositTx/sendDeposits.go
index b8c9823664..e9ab6fb8f4 100644
--- a/tools/sendDepositTx/sendDeposits.go
+++ b/tools/sendDepositTx/sendDeposits.go
@@ -48,7 +48,7 @@ func main() {
 	customFormatter.FullTimestamp = true
 	logrus.SetFormatter(customFormatter)
 
-	params.UseMedallaConfig()
+	params.UsePyrmontConfig()
 
 	app := cli.App{}
 	app.Name = "sendDepositTx"
diff --git a/validator/accounts/cmd_accounts.go b/validator/accounts/cmd_accounts.go
index 8656198687..ea39654f06 100644
--- a/validator/accounts/cmd_accounts.go
+++ b/validator/accounts/cmd_accounts.go
@@ -27,13 +27,8 @@ this command outputs a deposit data string which is required to become a validat
 				flags.WalletDirFlag,
 				flags.WalletPasswordFileFlag,
 				flags.NumAccountsFlag,
-				featureconfig.AltonaTestnet,
-				featureconfig.OnyxTestnet,
-				featureconfig.MedallaTestnet,
 				featureconfig.ToledoTestnet,
 				featureconfig.PyrmontTestnet,
-				featureconfig.SpadinaTestnet,
-				featureconfig.ZinkenTestnet,
 				cmd.AcceptTosFlag,
 			}),
 			Before: func(cliCtx *cli.Context) error {
@@ -57,13 +52,8 @@ this command outputs a deposit data string which is required to become a validat
 				flags.WalletDirFlag,
 				flags.WalletPasswordFileFlag,
 				flags.DeletePublicKeysFlag,
-				featureconfig.AltonaTestnet,
-				featureconfig.OnyxTestnet,
-				featureconfig.MedallaTestnet,
 				featureconfig.ToledoTestnet,
 				featureconfig.PyrmontTestnet,
-				featureconfig.SpadinaTestnet,
-				featureconfig.ZinkenTestnet,
 				cmd.AcceptTosFlag,
 			}),
 			Before: func(cliCtx *cli.Context) error {
@@ -88,13 +78,8 @@ this command outputs a deposit data string which is required to become a validat
 				flags.WalletPasswordFileFlag,
 				flags.ShowDepositDataFlag,
 				flags.ShowPrivateKeysFlag,
-				featureconfig.AltonaTestnet,
-				featureconfig.OnyxTestnet,
-				featureconfig.MedallaTestnet,
 				featureconfig.ToledoTestnet,
 				featureconfig.PyrmontTestnet,
-				featureconfig.SpadinaTestnet,
-				featureconfig.ZinkenTestnet,
 				cmd.AcceptTosFlag,
 			}),
 			Before: func(cliCtx *cli.Context) error {
@@ -123,13 +108,8 @@ this command outputs a deposit data string which is required to become a validat
 				flags.BackupDirFlag,
 				flags.BackupPublicKeysFlag,
 				flags.BackupPasswordFile,
-				featureconfig.AltonaTestnet,
-				featureconfig.OnyxTestnet,
-				featureconfig.MedallaTestnet,
 				featureconfig.ToledoTestnet,
 				featureconfig.PyrmontTestnet,
-				featureconfig.SpadinaTestnet,
-				featureconfig.ZinkenTestnet,
 				cmd.AcceptTosFlag,
 			}),
 			Before: func(cliCtx *cli.Context) error {
@@ -155,13 +135,8 @@ this command outputs a deposit data string which is required to become a validat
 				flags.WalletPasswordFileFlag,
 				flags.AccountPasswordFileFlag,
 				flags.ImportPrivateKeyFileFlag,
-				featureconfig.AltonaTestnet,
-				featureconfig.OnyxTestnet,
-				featureconfig.MedallaTestnet,
 				featureconfig.ToledoTestnet,
 				featureconfig.PyrmontTestnet,
-				featureconfig.SpadinaTestnet,
-				featureconfig.ZinkenTestnet,
 				cmd.AcceptTosFlag,
 			}),
 			Before: func(cliCtx *cli.Context) error {
@@ -192,13 +167,8 @@ this command outputs a deposit data string which is required to become a validat
 				flags.GrpcHeadersFlag,
 				flags.GrpcRetriesFlag,
 				flags.GrpcRetryDelayFlag,
-				featureconfig.AltonaTestnet,
-				featureconfig.OnyxTestnet,
-				featureconfig.MedallaTestnet,
 				featureconfig.ToledoTestnet,
 				featureconfig.PyrmontTestnet,
-				featureconfig.SpadinaTestnet,
-				featureconfig.ZinkenTestnet,
 				cmd.AcceptTosFlag,
 			}),
 			Before: func(cliCtx *cli.Context) error {
diff --git a/validator/accounts/cmd_wallet.go b/validator/accounts/cmd_wallet.go
index c91fd84a87..6871ba24e7 100644
--- a/validator/accounts/cmd_wallet.go
+++ b/validator/accounts/cmd_wallet.go
@@ -28,13 +28,8 @@ var WalletCommands = &cli.Command{
 				flags.WalletPasswordFileFlag,
 				flags.Mnemonic25thWordFileFlag,
 				flags.SkipMnemonic25thWordCheckFlag,
-				featureconfig.AltonaTestnet,
-				featureconfig.OnyxTestnet,
-				featureconfig.MedallaTestnet,
 				featureconfig.ToledoTestnet,
 				featureconfig.PyrmontTestnet,
-				featureconfig.SpadinaTestnet,
-				featureconfig.ZinkenTestnet,
 				cmd.AcceptTosFlag,
 			}),
 			Before: func(cliCtx *cli.Context) error {
@@ -60,13 +55,8 @@ var WalletCommands = &cli.Command{
 				flags.RemoteSignerCertPathFlag,
 				flags.RemoteSignerKeyPathFlag,
 				flags.RemoteSignerCACertPathFlag,
-				featureconfig.AltonaTestnet,
-				featureconfig.OnyxTestnet,
-				featureconfig.MedallaTestnet,
 				featureconfig.ToledoTestnet,
 				featureconfig.PyrmontTestnet,
-				featureconfig.SpadinaTestnet,
-				featureconfig.ZinkenTestnet,
 				cmd.AcceptTosFlag,
 			}),
 			Before: func(cliCtx *cli.Context) error {
@@ -93,13 +83,8 @@ var WalletCommands = &cli.Command{
 				flags.NumAccountsFlag,
 				flags.Mnemonic25thWordFileFlag,
 				flags.SkipMnemonic25thWordCheckFlag,
-				featureconfig.AltonaTestnet,
-				featureconfig.OnyxTestnet,
-				featureconfig.MedallaTestnet,
 				featureconfig.ToledoTestnet,
 				featureconfig.PyrmontTestnet,
-				featureconfig.SpadinaTestnet,
-				featureconfig.ZinkenTestnet,
 				cmd.AcceptTosFlag,
 			}),
 			Before: func(cliCtx *cli.Context) error {