diff --git a/credential/auth.go b/credential/auth.go
index a37173f..5a80591 100644
--- a/credential/auth.go
+++ b/credential/auth.go
@@ -8,8 +8,7 @@ import (
 )
 
 const (
-	ClaimToService             = "toService"
-	ProofPurposeAuthentication = "authentication"
+	ClaimToService = "toService"
 )
 
 const ErrAuthClaim MessageError = "invalid auth claim"
diff --git a/credential/generate.go b/credential/generate.go
index 34c6898..368ec6d 100644
--- a/credential/generate.go
+++ b/credential/generate.go
@@ -11,6 +11,11 @@ import (
 	"github.com/hyperledger/aries-framework-go/pkg/doc/verifiable"
 )
 
+const (
+	ProofPurposeAssertionMethod = "assertionMethod"
+	ProofPurposeAuthentication  = "authentication"
+)
+
 // Generator is a verifiable credential generator.
 type Generator struct {
 	vc        Descriptor
diff --git a/credential/template/dataset.go b/credential/template/dataset.go
index 8bbd772..38c4e6a 100644
--- a/credential/template/dataset.go
+++ b/credential/template/dataset.go
@@ -72,7 +72,7 @@ func (d *DatasetDescriptor) IssuedAt() *time.Time {
 }
 
 func (d *DatasetDescriptor) ProofPurpose() string {
-	return "assertionMethod"
+	return credential.ProofPurposeAssertionMethod
 }
 
 func (d *DatasetDescriptor) Generate() (*bytes.Buffer, error) {
diff --git a/credential/template/governance.go b/credential/template/governance.go
index 74367bf..548e4ed 100644
--- a/credential/template/governance.go
+++ b/credential/template/governance.go
@@ -55,7 +55,7 @@ func (g *GovernanceDescriptor) IssuedAt() *time.Time {
 }
 
 func (g *GovernanceDescriptor) ProofPurpose() string {
-	return "authentication"
+	return credential.ProofPurposeAssertionMethod
 }
 
 func (g *GovernanceDescriptor) Generate() (*bytes.Buffer, error) {
diff --git a/credential/template/publication.go b/credential/template/publication.go
index 460ca72..25735a1 100644
--- a/credential/template/publication.go
+++ b/credential/template/publication.go
@@ -56,7 +56,7 @@ func (d *PublicationDescriptor) IssuedAt() *time.Time {
 }
 
 func (d *PublicationDescriptor) ProofPurpose() string {
-	return "assertionMethod"
+	return credential.ProofPurposeAssertionMethod
 }
 
 func (d *PublicationDescriptor) Generate() (*bytes.Buffer, error) {