diff --git a/release/go/spacemesh/v1/types.pb.go b/release/go/spacemesh/v1/types.pb.go
index 8fd69068..3338db65 100644
--- a/release/go/spacemesh/v1/types.pb.go
+++ b/release/go/spacemesh/v1/types.pb.go
@@ -470,9 +470,15 @@ type Activation struct {
 	Layer     *LayerNumber  `protobuf:"bytes,2,opt,name=layer,proto3" json:"layer,omitempty"`                          // the layer that this activation is part of
 	SmesherId *SmesherId    `protobuf:"bytes,3,opt,name=smesher_id,json=smesherId,proto3" json:"smesher_id,omitempty"` // id of smesher who created the ATX
 	Coinbase  *AccountId    `protobuf:"bytes,4,opt,name=coinbase,proto3" json:"coinbase,omitempty"`                    // coinbase account id
-	PrevAtx   *ActivationId `protobuf:"bytes,5,opt,name=prev_atx,json=prevAtx,proto3" json:"prev_atx,omitempty"`       // previous ATX pointed to
-	NumUnits  uint32        `protobuf:"varint,6,opt,name=num_units,json=numUnits,proto3" json:"num_units,omitempty"`   // number of PoST data commitment units
-	Sequence  uint64        `protobuf:"varint,7,opt,name=sequence,proto3" json:"sequence,omitempty"`
+	// previous ATX pointed to
+	// deprecated to support ATX V2 and merging of ATXs: use previous_atxs instead
+	// a merged ATX might reference multiple previous ATXs
+	//
+	// Deprecated: Marked as deprecated in spacemesh/v1/types.proto.
+	PrevAtx      *ActivationId   `protobuf:"bytes,5,opt,name=prev_atx,json=prevAtx,proto3" json:"prev_atx,omitempty"`
+	NumUnits     uint32          `protobuf:"varint,6,opt,name=num_units,json=numUnits,proto3" json:"num_units,omitempty"` // number of PoST data commitment units
+	Sequence     uint64          `protobuf:"varint,7,opt,name=sequence,proto3" json:"sequence,omitempty"`
+	PreviousAtxs []*ActivationId `protobuf:"bytes,8,rep,name=previous_atxs,json=previousAtxs,proto3" json:"previous_atxs,omitempty"` // previous ATXs
 }
 
 func (x *Activation) Reset() {
@@ -535,6 +541,7 @@ func (x *Activation) GetCoinbase() *AccountId {
 	return nil
 }
 
+// Deprecated: Marked as deprecated in spacemesh/v1/types.proto.
 func (x *Activation) GetPrevAtx() *ActivationId {
 	if x != nil {
 		return x.PrevAtx
@@ -556,6 +563,13 @@ func (x *Activation) GetSequence() uint64 {
 	return 0
 }
 
+func (x *Activation) GetPreviousAtxs() []*ActivationId {
+	if x != nil {
+		return x.PreviousAtxs
+	}
+	return nil
+}
+
 // An immutable Spacemesh transaction.
 // do not include mutable data such as tx state or result.
 type Transaction struct {
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 var (
@@ -1550,34 +1568,35 @@ var file_spacemesh_v1_types_proto_depIdxs = []int32{
 	8,  // 2: spacemesh.v1.Activation.smesher_id:type_name -> spacemesh.v1.SmesherId
 	5,  // 3: spacemesh.v1.Activation.coinbase:type_name -> spacemesh.v1.AccountId
 	7,  // 4: spacemesh.v1.Activation.prev_atx:type_name -> spacemesh.v1.ActivationId
-	5,  // 5: spacemesh.v1.Transaction.principal:type_name -> spacemesh.v1.AccountId
-	5,  // 6: spacemesh.v1.Transaction.template:type_name -> spacemesh.v1.AccountId
-	12, // 7: spacemesh.v1.Transaction.nonce:type_name -> spacemesh.v1.Nonce
-	11, // 8: spacemesh.v1.Transaction.limits:type_name -> spacemesh.v1.LayerLimits
-	10, // 9: spacemesh.v1.MeshTransaction.transaction:type_name -> spacemesh.v1.Transaction
-	17, // 10: spacemesh.v1.MeshTransaction.layer_id:type_name -> spacemesh.v1.LayerNumber
-	17, // 11: spacemesh.v1.Reward.layer:type_name -> spacemesh.v1.LayerNumber
-	4,  // 12: spacemesh.v1.Reward.total:type_name -> spacemesh.v1.Amount
-	4,  // 13: spacemesh.v1.Reward.layer_reward:type_name -> spacemesh.v1.Amount
-	17, // 14: spacemesh.v1.Reward.layer_computed:type_name -> spacemesh.v1.LayerNumber
-	5,  // 15: spacemesh.v1.Reward.coinbase:type_name -> spacemesh.v1.AccountId
-	8,  // 16: spacemesh.v1.Reward.smesher:type_name -> spacemesh.v1.SmesherId
-	10, // 17: spacemesh.v1.Block.transactions:type_name -> spacemesh.v1.Transaction
-	7,  // 18: spacemesh.v1.Block.activation_id:type_name -> spacemesh.v1.ActivationId
-	8,  // 19: spacemesh.v1.Block.smesher_id:type_name -> spacemesh.v1.SmesherId
-	17, // 20: spacemesh.v1.Layer.number:type_name -> spacemesh.v1.LayerNumber
-	0,  // 21: spacemesh.v1.Layer.status:type_name -> spacemesh.v1.Layer.LayerStatus
-	15, // 22: spacemesh.v1.Layer.blocks:type_name -> spacemesh.v1.Block
-	9,  // 23: spacemesh.v1.Layer.activations:type_name -> spacemesh.v1.Activation
-	6,  // 24: spacemesh.v1.AppEvent.transaction_id:type_name -> spacemesh.v1.TransactionId
-	8,  // 25: spacemesh.v1.MalfeasanceProof.smesher_id:type_name -> spacemesh.v1.SmesherId
-	17, // 26: spacemesh.v1.MalfeasanceProof.layer:type_name -> spacemesh.v1.LayerNumber
-	1,  // 27: spacemesh.v1.MalfeasanceProof.kind:type_name -> spacemesh.v1.MalfeasanceProof.MalfeasanceType
-	28, // [28:28] is the sub-list for method output_type
-	28, // [28:28] is the sub-list for method input_type
-	28, // [28:28] is the sub-list for extension type_name
-	28, // [28:28] is the sub-list for extension extendee
-	0,  // [0:28] is the sub-list for field type_name
+	7,  // 5: spacemesh.v1.Activation.previous_atxs:type_name -> spacemesh.v1.ActivationId
+	5,  // 6: spacemesh.v1.Transaction.principal:type_name -> spacemesh.v1.AccountId
+	5,  // 7: spacemesh.v1.Transaction.template:type_name -> spacemesh.v1.AccountId
+	12, // 8: spacemesh.v1.Transaction.nonce:type_name -> spacemesh.v1.Nonce
+	11, // 9: spacemesh.v1.Transaction.limits:type_name -> spacemesh.v1.LayerLimits
+	10, // 10: spacemesh.v1.MeshTransaction.transaction:type_name -> spacemesh.v1.Transaction
+	17, // 11: spacemesh.v1.MeshTransaction.layer_id:type_name -> spacemesh.v1.LayerNumber
+	17, // 12: spacemesh.v1.Reward.layer:type_name -> spacemesh.v1.LayerNumber
+	4,  // 13: spacemesh.v1.Reward.total:type_name -> spacemesh.v1.Amount
+	4,  // 14: spacemesh.v1.Reward.layer_reward:type_name -> spacemesh.v1.Amount
+	17, // 15: spacemesh.v1.Reward.layer_computed:type_name -> spacemesh.v1.LayerNumber
+	5,  // 16: spacemesh.v1.Reward.coinbase:type_name -> spacemesh.v1.AccountId
+	8,  // 17: spacemesh.v1.Reward.smesher:type_name -> spacemesh.v1.SmesherId
+	10, // 18: spacemesh.v1.Block.transactions:type_name -> spacemesh.v1.Transaction
+	7,  // 19: spacemesh.v1.Block.activation_id:type_name -> spacemesh.v1.ActivationId
+	8,  // 20: spacemesh.v1.Block.smesher_id:type_name -> spacemesh.v1.SmesherId
+	17, // 21: spacemesh.v1.Layer.number:type_name -> spacemesh.v1.LayerNumber
+	0,  // 22: spacemesh.v1.Layer.status:type_name -> spacemesh.v1.Layer.LayerStatus
+	15, // 23: spacemesh.v1.Layer.blocks:type_name -> spacemesh.v1.Block
+	9,  // 24: spacemesh.v1.Layer.activations:type_name -> spacemesh.v1.Activation
+	6,  // 25: spacemesh.v1.AppEvent.transaction_id:type_name -> spacemesh.v1.TransactionId
+	8,  // 26: spacemesh.v1.MalfeasanceProof.smesher_id:type_name -> spacemesh.v1.SmesherId
+	17, // 27: spacemesh.v1.MalfeasanceProof.layer:type_name -> spacemesh.v1.LayerNumber
+	1,  // 28: spacemesh.v1.MalfeasanceProof.kind:type_name -> spacemesh.v1.MalfeasanceProof.MalfeasanceType
+	29, // [29:29] is the sub-list for method output_type
+	29, // [29:29] is the sub-list for method input_type
+	29, // [29:29] is the sub-list for extension type_name
+	29, // [29:29] is the sub-list for extension extendee
+	0,  // [0:29] is the sub-list for field type_name
 }
 
 func init() { file_spacemesh_v1_types_proto_init() }
diff --git a/spacemesh/v1/types.proto b/spacemesh/v1/types.proto
index 2e49f091..0056129a 100644
--- a/spacemesh/v1/types.proto
+++ b/spacemesh/v1/types.proto
@@ -37,9 +37,13 @@ message Activation {
     LayerNumber layer = 2; // the layer that this activation is part of
     SmesherId smesher_id = 3; // id of smesher who created the ATX
     AccountId coinbase = 4; // coinbase account id
-    ActivationId prev_atx = 5; // previous ATX pointed to
+    // previous ATX pointed to
+    // deprecated to support ATX V2 and merging of ATXs: use previous_atxs instead
+    // a merged ATX might reference multiple previous ATXs
+    ActivationId prev_atx = 5 [deprecated = true];
     uint32 num_units = 6; // number of PoST data commitment units
     uint64 sequence = 7;
+    repeated ActivationId previous_atxs = 8; // previous ATXs
 }
 
 // An immutable Spacemesh transaction.
@@ -132,4 +136,4 @@ message MalfeasanceProof {
     MalfeasanceType kind = 3;
     string debug_info = 4;
     bytes proof = 5;
-}
\ No newline at end of file
+}