diff --git a/document/document_test.go b/document/document_test.go
index e28364b..bd95767 100644
--- a/document/document_test.go
+++ b/document/document_test.go
@@ -23,11 +23,11 @@ func TestRoundTrip(t *testing.T) {
 			strDoc: ed25519Doc,
 			assertion: func(t *testing.T, doc *Document) {
 				require.Equal(t, "did:key:z6MkhaXgBZDvotDkL5257faiztiGiC2QtKLGpbnnEGta2doK", doc.ID())
-				require.Equal(t, ed25519vm.Type, doc.Authentication()[0].Type())
-				require.Equal(t, ed25519vm.Type, doc.Assertion()[0].Type())
-				require.Equal(t, x25519vm.Type, doc.KeyAgreement()[0].Type())
-				require.Equal(t, ed25519vm.Type, doc.CapabilityInvocation()[0].Type())
-				require.Equal(t, ed25519vm.Type, doc.CapabilityDelegation()[0].Type())
+				require.Equal(t, ed25519vm.Type2020, doc.Authentication()[0].Type())
+				require.Equal(t, ed25519vm.Type2020, doc.Assertion()[0].Type())
+				require.Equal(t, x25519vm.Type2020, doc.KeyAgreement()[0].Type())
+				require.Equal(t, ed25519vm.Type2020, doc.CapabilityInvocation()[0].Type())
+				require.Equal(t, ed25519vm.Type2020, doc.CapabilityDelegation()[0].Type())
 			},
 		},
 		{
diff --git a/verifications/json.go b/verifications/json.go
index 382b9de..8c6c1f4 100644
--- a/verifications/json.go
+++ b/verifications/json.go
@@ -8,6 +8,8 @@ import (
 	"github.com/INFURA/go-did/verifications/ed25519"
 	"github.com/INFURA/go-did/verifications/jsonwebkey"
 	"github.com/INFURA/go-did/verifications/multikey"
+	p256vm "github.com/INFURA/go-did/verifications/p256"
+	secp256k1vm "github.com/INFURA/go-did/verifications/secp256k1"
 	"github.com/INFURA/go-did/verifications/x25519"
 )
 
@@ -21,11 +23,19 @@ func UnmarshalJSON(data []byte) (did.VerificationMethod, error) {
 
 	var res did.VerificationMethod
 	switch aux.Type {
-	case ed25519vm.Type:
+	case ed25519vm.Type2018:
+		res = &ed25519vm.VerificationKey2018{}
+	case ed25519vm.Type2020:
 		res = &ed25519vm.VerificationKey2020{}
 	case multikey.Type:
 		res = &multikey.MultiKey{}
-	case x25519vm.Type:
+	case p256vm.Type2021:
+		res = &p256vm.Key2021{}
+	case secp256k1vm.Type:
+		res = &secp256k1vm.VerificationKey2019{}
+	case x25519vm.Type2019:
+		res = &x25519vm.KeyAgreementKey2019{}
+	case x25519vm.Type2020:
 		res = &x25519vm.KeyAgreementKey2020{}
 	case jsonwebkey.Type:
 		res = &jsonwebkey.JsonWebKey2020{}
diff --git a/verifications/secp256k1/key2021.go b/verifications/secp256k1/key2021.go
new file mode 100644
index 0000000..15146c5
--- /dev/null
+++ b/verifications/secp256k1/key2021.go
@@ -0,0 +1,114 @@
+package secp256k1vm
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+
+	"github.com/mr-tron/base58"
+
+	"github.com/INFURA/go-did"
+	"github.com/INFURA/go-did/crypto"
+	"github.com/INFURA/go-did/crypto/secp256k1"
+)
+
+// Specification: https://w3c-ccg.github.io/lds-ecdsa-secp256k1-2019/
+
+const (
+	JsonLdContext = "https://w3id.org/security/suites/secp256k1-2019/v1"
+	Type          = "EcdsaSecp256k1VerificationKey2019"
+)
+
+var _ did.VerificationMethodSignature = &VerificationKey2019{}
+var _ did.VerificationMethodKeyAgreement = &VerificationKey2019{}
+
+type VerificationKey2019 struct {
+	id         string
+	pubkey     *secp256k1.PublicKey
+	controller string
+}
+
+func NewVerificationKey2019(id string, pubkey *secp256k1.PublicKey, controller did.DID) *VerificationKey2019 {
+	return &VerificationKey2019{
+		id:         id,
+		pubkey:     pubkey,
+		controller: controller.String(),
+	}
+}
+
+func (vm VerificationKey2019) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		ID              string `json:"id"`
+		Type            string `json:"type"`
+		Controller      string `json:"controller"`
+		PublicKeyBase58 string `json:"publicKeyBase58"`
+	}{
+		ID:              vm.ID(),
+		Type:            vm.Type(),
+		Controller:      vm.Controller(),
+		PublicKeyBase58: base58.Encode(vm.pubkey.ToBytes()),
+	})
+}
+
+func (vm *VerificationKey2019) UnmarshalJSON(bytes []byte) error {
+	aux := struct {
+		ID              string `json:"id"`
+		Type            string `json:"type"`
+		Controller      string `json:"controller"`
+		PublicKeyBase58 string `json:"publicKeyBase58"`
+	}{}
+	err := json.Unmarshal(bytes, &aux)
+	if err != nil {
+		return err
+	}
+	if aux.Type != vm.Type() {
+		return errors.New("invalid type")
+	}
+	vm.id = aux.ID
+	if len(vm.id) == 0 {
+		return errors.New("invalid id")
+	}
+	vm.controller = aux.Controller
+	if !did.HasValidDIDSyntax(vm.controller) {
+		return errors.New("invalid controller")
+	}
+
+	pubBytes, err := base58.Decode(aux.PublicKeyBase58)
+	if err != nil {
+		return fmt.Errorf("invalid publicKeyBase58: %w", err)
+	}
+	vm.pubkey, err = secp256k1.PublicKeyFromBytes(pubBytes)
+	if err != nil {
+		return fmt.Errorf("invalid publicKeyBase58: %w", err)
+	}
+
+	return nil
+}
+
+func (vm VerificationKey2019) ID() string {
+	return vm.id
+}
+
+func (vm VerificationKey2019) Type() string {
+	return Type
+}
+
+func (vm VerificationKey2019) Controller() string {
+	return vm.controller
+}
+
+func (vm VerificationKey2019) JsonLdContext() string {
+	return JsonLdContext
+}
+
+func (vm VerificationKey2019) Verify(data []byte, sig []byte) (bool, error) {
+	return vm.pubkey.VerifyBytes(data, sig), nil
+}
+
+func (vm VerificationKey2019) PrivateKeyIsCompatible(local crypto.PrivateKeyKeyExchange) bool {
+	return local.PublicKeyIsCompatible(vm.pubkey)
+}
+
+func (vm VerificationKey2019) KeyExchange(local crypto.PrivateKeyKeyExchange) ([]byte, error) {
+	return local.KeyExchange(vm.pubkey)
+}
diff --git a/verifications/secp256k1/key2021_test.go b/verifications/secp256k1/key2021_test.go
new file mode 100644
index 0000000..19515e0
--- /dev/null
+++ b/verifications/secp256k1/key2021_test.go
@@ -0,0 +1,27 @@
+package secp256k1vm_test
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	secp256k1vm "github.com/INFURA/go-did/verifications/secp256k1"
+)
+
+func TestJsonRoundTrip(t *testing.T) {
+	data := `{
+          "id": "did:key:zQ3shadCps5JLAHcZiuX5YUtWHHL8ysBJqFLWvjZDKAWUBGzy#zQ3shadCps5JLAHcZiuX5YUtWHHL8ysBJqFLWvjZDKAWUBGzy",
+          "type": "EcdsaSecp256k1VerificationKey2019",
+          "controller": "did:key:zQ3shadCps5JLAHcZiuX5YUtWHHL8ysBJqFLWvjZDKAWUBGzy",
+          "publicKeyBase58": "pg3p1vprqePgUoqfAQ1TTgxhL6zLYhHyzooR1pqLxo9F"
+        }`
+
+	var mk secp256k1vm.VerificationKey2019
+	err := json.Unmarshal([]byte(data), &mk)
+	require.NoError(t, err)
+
+	bytes, err := json.Marshal(mk)
+	require.NoError(t, err)
+	require.JSONEq(t, data, string(bytes))
+}