diff --git a/coev/cbor.go b/coev/cbor.go
index 64b07a21..7d07eed5 100644
--- a/coev/cbor.go
+++ b/coev/cbor.go
@@ -39,7 +39,7 @@ func coevTags() cbor.TagSet {
 func initCBOREncMode() (en cbor.EncMode, err error) {
 	encOpt := cbor.EncOptions{
 		Sort:        cbor.SortCoreDeterministic,
-		IndefLength: cbor.IndefLengthForbidden,
+		IndefLength: cbor.IndefLengthAllowed,
 		TimeTag:     cbor.EncTagRequired,
 	}
 	return encOpt.EncModeWithTags(coevTags())
@@ -47,7 +47,7 @@ func initCBOREncMode() (en cbor.EncMode, err error) {
 
 func initCBORDecMode() (dm cbor.DecMode, err error) {
 	decOpt := cbor.DecOptions{
-		IndefLength: cbor.IndefLengthForbidden,
+		IndefLength: cbor.IndefLengthAllowed,
 	}
 	return decOpt.DecModeWithTags(coevTags())
 }
diff --git a/comid/cbor.go b/comid/cbor.go
index 9f6313ea..330d8e15 100644
--- a/comid/cbor.go
+++ b/comid/cbor.go
@@ -59,7 +59,7 @@ func comidTags() cbor.TagSet {
 func initCBOREncMode() (en cbor.EncMode, err error) {
 	encOpt := cbor.EncOptions{
 		Sort:        cbor.SortCoreDeterministic,
-		IndefLength: cbor.IndefLengthForbidden,
+		IndefLength: cbor.IndefLengthAllowed,
 		TimeTag:     cbor.EncTagRequired,
 	}
 	return encOpt.EncModeWithTags(comidTags())
@@ -67,7 +67,7 @@ func initCBOREncMode() (en cbor.EncMode, err error) {
 
 func initCBORDecMode() (dm cbor.DecMode, err error) {
 	decOpt := cbor.DecOptions{
-		IndefLength: cbor.IndefLengthForbidden,
+		IndefLength: cbor.IndefLengthAllowed,
 	}
 	return decOpt.DecModeWithTags(comidTags())
 }
diff --git a/comid/tdx/cbor.go b/comid/tdx/cbor.go
index c850fbd5..cfbda766 100644
--- a/comid/tdx/cbor.go
+++ b/comid/tdx/cbor.go
@@ -41,7 +41,7 @@ func tdxTags() cbor.TagSet {
 func initCBOREncMode() (en cbor.EncMode, err error) {
 	encOpt := cbor.EncOptions{
 		Sort:        cbor.SortCoreDeterministic,
-		IndefLength: cbor.IndefLengthForbidden,
+		IndefLength: cbor.IndefLengthAllowed,
 		TimeTag:     cbor.EncTagRequired,
 	}
 	return encOpt.EncModeWithTags(tdxTags())
@@ -49,7 +49,7 @@ func initCBOREncMode() (en cbor.EncMode, err error) {
 
 func initCBORDecMode() (dm cbor.DecMode, err error) {
 	decOpt := cbor.DecOptions{
-		IndefLength: cbor.IndefLengthForbidden,
+		IndefLength: cbor.IndefLengthAllowed,
 	}
 	return decOpt.DecModeWithTags(tdxTags())
 }
diff --git a/corim/cbor.go b/corim/cbor.go
index c47166e2..0404bb89 100644
--- a/corim/cbor.go
+++ b/corim/cbor.go
@@ -45,7 +45,7 @@ func corimTags() cbor.TagSet {
 
 func initCBOREncMode() (en cbor.EncMode, err error) {
 	encOpt := cbor.EncOptions{
-		IndefLength: cbor.IndefLengthForbidden,
+		IndefLength: cbor.IndefLengthAllowed,
 		TimeTag:     cbor.EncTagRequired,
 	}
 	return encOpt.EncModeWithTags(corimTags())
@@ -53,7 +53,7 @@ func initCBOREncMode() (en cbor.EncMode, err error) {
 
 func initCBORDecMode() (dm cbor.DecMode, err error) {
 	decOpt := cbor.DecOptions{
-		IndefLength: cbor.IndefLengthForbidden,
+		IndefLength: cbor.IndefLengthAllowed,
 		TimeTag:     cbor.DecTagRequired,
 	}
 	return decOpt.DecModeWithTags(corimTags())
diff --git a/coserv/quads.go b/coserv/quads.go
index e8af8096..731138ff 100644
--- a/coserv/quads.go
+++ b/coserv/quads.go
@@ -10,6 +10,13 @@ type RefValQuad struct {
 	RVTriple    *comid.ValueTriple `cbor:"2,keyasint"`
 }
 
+// EndorsedValQuad represents an endorsed-values result quad as per CoSERV
+// It mirrors RefValQuad but carries endorsed values instead of reference values
+type EndorsedValQuad struct {
+	Authorities *[]comid.CryptoKey `cbor:"1,keyasint"`
+	EVTriple    *comid.ValueTriple `cbor:"2,keyasint"`
+}
+
 type AKQuad struct {
 	Authorities *[]comid.CryptoKey `cbor:"1,keyasint"`
 	AKTriple    *comid.KeyTriple   `cbor:"2,keyasint"`
diff --git a/coserv/resultset.go b/coserv/resultset.go
index 87d9b711..68e216bd 100644
--- a/coserv/resultset.go
+++ b/coserv/resultset.go
@@ -11,9 +11,9 @@ import (
 )
 
 type ResultSet struct {
-	RVQ *[]RefValQuad `cbor:"0,keyasint,omitempty"`
-	AKQ *[]AKQuad     `cbor:"3,keyasint,omitempty"`
-	// TODO(tho) add endorsed values
+	RVQ *[]RefValQuad      `cbor:"0,keyasint,omitempty"`
+	EVQ *[]EndorsedValQuad `cbor:"1,keyasint,omitempty"`
+	AKQ *[]AKQuad          `cbor:"3,keyasint,omitempty"`
 	// TODO(tho) add CoTS
 	Expiry          *time.Time `cbor:"10,keyasint"`
 	SourceArtifacts *[]cmw.CMW `cbor:"11,keyasint,omitempty"`
@@ -35,6 +35,17 @@ func (o *ResultSet) AddReferenceValues(v RefValQuad) *ResultSet {
 	return o
 }
 
+// AddEndorsedValues adds the supplied endorsed-values quad to the target ResultSet
+func (o *ResultSet) AddEndorsedValues(v EndorsedValQuad) *ResultSet {
+	if o.EVQ == nil {
+		o.EVQ = new([]EndorsedValQuad)
+	}
+
+	*o.EVQ = append(*o.EVQ, v)
+
+	return o
+}
+
 // AddAttestationKeys adds the supplied ak quad to the target ResultSet
 func (o *ResultSet) AddAttestationKeys(v AKQuad) *ResultSet {
 	if o.AKQ == nil {
@@ -68,6 +79,7 @@ func (o ResultSet) Valid() error {
 	if o.Expiry == nil {
 		return errors.New("missing mandatory expiry")
 	}
+	// Nothing else to validate structurally here; combinations are checked at Coserv level
 	// The coherency between query and results must be checked by the Coserv's
 	// Valid()
 	return nil
diff --git a/cots/cbor.go b/cots/cbor.go
index aa6f2af6..9f909b0e 100644
--- a/cots/cbor.go
+++ b/cots/cbor.go
@@ -42,7 +42,7 @@ func cotsTags() cbor.TagSet {
 
 func initCBOREncMode() (en cbor.EncMode, err error) {
 	encOpt := cbor.EncOptions{
-		IndefLength: cbor.IndefLengthForbidden,
+		IndefLength: cbor.IndefLengthAllowed,
 		TimeTag:     cbor.EncTagRequired,
 	}
 	return encOpt.EncModeWithTags(cotsTags())
@@ -50,7 +50,7 @@ func initCBOREncMode() (en cbor.EncMode, err error) {
 
 func initCBORDecMode() (dm cbor.DecMode, err error) {
 	decOpt := cbor.DecOptions{
-		IndefLength: cbor.IndefLengthForbidden,
+		IndefLength: cbor.IndefLengthAllowed,
 		TimeTag:     cbor.DecTagRequired,
 	}
 	return decOpt.DecModeWithTags(cotsTags())
diff --git a/extensions/cbor.go b/extensions/cbor.go
index 03ef31ca..dbfecc78 100644
--- a/extensions/cbor.go
+++ b/extensions/cbor.go
@@ -15,7 +15,7 @@ var (
 func initCBOREncMode() (en cbor.EncMode, err error) {
 	encOpt := cbor.EncOptions{
 		Sort:        cbor.SortCoreDeterministic,
-		IndefLength: cbor.IndefLengthForbidden,
+		IndefLength: cbor.IndefLengthAllowed,
 		TimeTag:     cbor.EncTagRequired,
 	}
 	return encOpt.EncMode()
@@ -23,7 +23,7 @@ func initCBOREncMode() (en cbor.EncMode, err error) {
 
 func initCBORDecMode() (dm cbor.DecMode, err error) {
 	decOpt := cbor.DecOptions{
-		IndefLength: cbor.IndefLengthForbidden,
+		IndefLength: cbor.IndefLengthAllowed,
 	}
 	return decOpt.DecMode()
 }