diff --git a/proto/spacemesh/v1/types.proto b/proto/spacemesh/v1/types.proto
index c82a1162..ed50ef3f 100644
--- a/proto/spacemesh/v1/types.proto
+++ b/proto/spacemesh/v1/types.proto
@@ -31,41 +31,6 @@ message SmesherId {
     bytes id = 1;
 }
 
-message GasOffered {
-    uint64 gas_provided = 1;
-    uint64 gas_price = 2;
-}
-
-// Data specific to a simple coin transaction.
-message CoinTransferTransaction {
-    AccountId receiver = 1;
-}
-
-// Data specific to a smart contract transaction.
-message SmartContractTransaction {
-    enum TransactionType {
-        TRANSACTION_TYPE_UNSPECIFIED = 0;
-        TRANSACTION_TYPE_APP = 1; // smart contract method
-        TRANSACTION_TYPE_APP_SPAWN_APP = 2; // deploy app from template using svm terminology
-        TRANSACTION_TYPE_DEPLOY_TEMPLATE = 3; // deploy app template code to mesh
-    }
-    TransactionType type = 1;
-    bytes data = 2; // packed binary arguments, including ABI selector
-    AccountId account_id = 3; // address of smart contract or template
-}
-
-// A simple signature data
-message Signature {
-    enum Scheme {
-        SCHEME_UNSPECIFIED = 0;
-        SCHEME_ED25519 = 1; // standard Ed25519 scheme
-        SCHEME_ED25519_PLUS_PLUS = 2; // sm-modified ED25519 , a.k.a. ED25519++
-    }
-    Scheme scheme = 1; // the signature's scheme
-    bytes signature = 2; // the signature itself
-    bytes public_key = 3; // included in schemes which require signer to provide a public key
-}
-
 // An Activation "transaction" (ATX)
 message Activation {
     ActivationId id = 1;
@@ -79,18 +44,29 @@ message Activation {
 // An immutable Spacemesh transaction.
 // do not include mutable data such as tx state or result.
 message Transaction {
-    TransactionId id = 1;
-    oneof datum {
-        CoinTransferTransaction coin_transfer = 2;
-        SmartContractTransaction smart_contract = 3;
-    }
-    AccountId sender = 4; // tx originator, should match signer inside Signature
-    GasOffered gas_offered = 5; // gas price and max gas offered
-    Amount amount = 6; // amount of coin transfered in this tx by sender
-    uint64 counter = 7; // tx counter aka nonce
-    Signature signature = 8; // sender signature on transaction
+    bytes id = 1;
+    bytes principal = 2;
+    bytes template = 3;
+    uint32 method = 4;
+    Nonce nonce = 5;
+    LayerLimits limits = 6;
+    uint64 max_gas = 7;
+    uint64 gas_price = 8;
+    uint64 max_spend = 9;
+    bytes raw = 10;
+}
+
+message LayerLimits {
+    uint32 min = 1;
+    uint32 max = 2;
+}
+
+message Nonce {
+    uint64 counter = 1;
+    uint32 bitfield = 2; // this is actually limited by uint8, but no type for that.
 }
 
+
 // Transaction that was added to the mesh.
 message MeshTransaction {
     Transaction transaction = 1;
diff --git a/release/go/spacemesh/v1/debug.pb.go b/release/go/spacemesh/v1/debug.pb.go
index d2c51d81..efe86cdf 100644
--- a/release/go/spacemesh/v1/debug.pb.go
+++ b/release/go/spacemesh/v1/debug.pb.go
@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.25.0
+// 	protoc-gen-go v1.23.0
 // 	protoc        v3.12.3
 // source: spacemesh/v1/debug.proto
 
diff --git a/release/go/spacemesh/v1/debug_types.pb.go b/release/go/spacemesh/v1/debug_types.pb.go
index 2f37d235..966155f4 100644
--- a/release/go/spacemesh/v1/debug_types.pb.go
+++ b/release/go/spacemesh/v1/debug_types.pb.go
@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.25.0
+// 	protoc-gen-go v1.23.0
 // 	protoc        v3.12.3
 // source: spacemesh/v1/debug_types.proto
 
diff --git a/release/go/spacemesh/v1/gateway.pb.go b/release/go/spacemesh/v1/gateway.pb.go
index 13d63be4..225c5d6a 100644
--- a/release/go/spacemesh/v1/gateway.pb.go
+++ b/release/go/spacemesh/v1/gateway.pb.go
@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.25.0
+// 	protoc-gen-go v1.23.0
 // 	protoc        v3.12.3
 // source: spacemesh/v1/gateway.proto
 
diff --git a/release/go/spacemesh/v1/gateway_types.pb.go b/release/go/spacemesh/v1/gateway_types.pb.go
index 237712dc..45d5b6f6 100644
--- a/release/go/spacemesh/v1/gateway_types.pb.go
+++ b/release/go/spacemesh/v1/gateway_types.pb.go
@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.25.0
+// 	protoc-gen-go v1.23.0
 // 	protoc        v3.12.3
 // source: spacemesh/v1/gateway_types.proto
 
diff --git a/release/go/spacemesh/v1/global_state.pb.go b/release/go/spacemesh/v1/global_state.pb.go
index 3b108997..04899374 100644
--- a/release/go/spacemesh/v1/global_state.pb.go
+++ b/release/go/spacemesh/v1/global_state.pb.go
@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.25.0
+// 	protoc-gen-go v1.23.0
 // 	protoc        v3.12.3
 // source: spacemesh/v1/global_state.proto
 
diff --git a/release/go/spacemesh/v1/global_state_types.pb.go b/release/go/spacemesh/v1/global_state_types.pb.go
index f43eae26..14edeb56 100644
--- a/release/go/spacemesh/v1/global_state_types.pb.go
+++ b/release/go/spacemesh/v1/global_state_types.pb.go
@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.25.0
+// 	protoc-gen-go v1.23.0
 // 	protoc        v3.12.3
 // source: spacemesh/v1/global_state_types.proto
 
diff --git a/release/go/spacemesh/v1/mesh.pb.go b/release/go/spacemesh/v1/mesh.pb.go
index 58503377..b23fd74e 100644
--- a/release/go/spacemesh/v1/mesh.pb.go
+++ b/release/go/spacemesh/v1/mesh.pb.go
@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.25.0
+// 	protoc-gen-go v1.23.0
 // 	protoc        v3.12.3
 // source: spacemesh/v1/mesh.proto
 
diff --git a/release/go/spacemesh/v1/mesh_types.pb.go b/release/go/spacemesh/v1/mesh_types.pb.go
index f5264f65..67926c87 100644
--- a/release/go/spacemesh/v1/mesh_types.pb.go
+++ b/release/go/spacemesh/v1/mesh_types.pb.go
@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.25.0
+// 	protoc-gen-go v1.23.0
 // 	protoc        v3.12.3
 // source: spacemesh/v1/mesh_types.proto
 
diff --git a/release/go/spacemesh/v1/node.pb.go b/release/go/spacemesh/v1/node.pb.go
index 27f1bf24..67dc2fab 100644
--- a/release/go/spacemesh/v1/node.pb.go
+++ b/release/go/spacemesh/v1/node.pb.go
@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.25.0
+// 	protoc-gen-go v1.23.0
 // 	protoc        v3.12.3
 // source: spacemesh/v1/node.proto
 
diff --git a/release/go/spacemesh/v1/node_types.pb.go b/release/go/spacemesh/v1/node_types.pb.go
index cc179d50..1157fe97 100644
--- a/release/go/spacemesh/v1/node_types.pb.go
+++ b/release/go/spacemesh/v1/node_types.pb.go
@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.25.0
+// 	protoc-gen-go v1.23.0
 // 	protoc        v3.12.3
 // source: spacemesh/v1/node_types.proto
 
diff --git a/release/go/spacemesh/v1/smesher.pb.go b/release/go/spacemesh/v1/smesher.pb.go
index 38903f09..31b28a8e 100644
--- a/release/go/spacemesh/v1/smesher.pb.go
+++ b/release/go/spacemesh/v1/smesher.pb.go
@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.25.0
+// 	protoc-gen-go v1.23.0
 // 	protoc        v3.12.3
 // source: spacemesh/v1/smesher.proto
 
diff --git a/release/go/spacemesh/v1/smesher_types.pb.go b/release/go/spacemesh/v1/smesher_types.pb.go
index a590a7c7..236f1069 100644
--- a/release/go/spacemesh/v1/smesher_types.pb.go
+++ b/release/go/spacemesh/v1/smesher_types.pb.go
@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.25.0
+// 	protoc-gen-go v1.23.0
 // 	protoc        v3.12.3
 // source: spacemesh/v1/smesher_types.proto
 
diff --git a/release/go/spacemesh/v1/tx.pb.go b/release/go/spacemesh/v1/tx.pb.go
index 0a34ea43..e319d64d 100644
--- a/release/go/spacemesh/v1/tx.pb.go
+++ b/release/go/spacemesh/v1/tx.pb.go
@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.25.0
+// 	protoc-gen-go v1.23.0
 // 	protoc        v3.12.3
 // source: spacemesh/v1/tx.proto
 
diff --git a/release/go/spacemesh/v1/tx_types.pb.go b/release/go/spacemesh/v1/tx_types.pb.go
index 83d5a967..9a8e4eb4 100644
--- a/release/go/spacemesh/v1/tx_types.pb.go
+++ b/release/go/spacemesh/v1/tx_types.pb.go
@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.25.0
+// 	protoc-gen-go v1.23.0
 // 	protoc        v3.12.3
 // source: spacemesh/v1/tx_types.proto
 
diff --git a/release/go/spacemesh/v1/types.pb.go b/release/go/spacemesh/v1/types.pb.go
index 5c34fa33..d77cb1a5 100644
--- a/release/go/spacemesh/v1/types.pb.go
+++ b/release/go/spacemesh/v1/types.pb.go
@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.25.0
+// 	protoc-gen-go v1.23.0
 // 	protoc        v3.12.3
 // source: spacemesh/v1/types.proto
 
@@ -25,107 +25,6 @@ const (
 // of the legacy proto package is being used.
 const _ = proto.ProtoPackageIsVersion4
 
-type SmartContractTransaction_TransactionType int32
-
-const (
-	SmartContractTransaction_TRANSACTION_TYPE_UNSPECIFIED     SmartContractTransaction_TransactionType = 0
-	SmartContractTransaction_TRANSACTION_TYPE_APP             SmartContractTransaction_TransactionType = 1 // smart contract method
-	SmartContractTransaction_TRANSACTION_TYPE_APP_SPAWN_APP   SmartContractTransaction_TransactionType = 2 // deploy app from template using svm terminology
-	SmartContractTransaction_TRANSACTION_TYPE_DEPLOY_TEMPLATE SmartContractTransaction_TransactionType = 3 // deploy app template code to mesh
-)
-
-// Enum value maps for SmartContractTransaction_TransactionType.
-var (
-	SmartContractTransaction_TransactionType_name = map[int32]string{
-		0: "TRANSACTION_TYPE_UNSPECIFIED",
-		1: "TRANSACTION_TYPE_APP",
-		2: "TRANSACTION_TYPE_APP_SPAWN_APP",
-		3: "TRANSACTION_TYPE_DEPLOY_TEMPLATE",
-	}
-	SmartContractTransaction_TransactionType_value = map[string]int32{
-		"TRANSACTION_TYPE_UNSPECIFIED":     0,
-		"TRANSACTION_TYPE_APP":             1,
-		"TRANSACTION_TYPE_APP_SPAWN_APP":   2,
-		"TRANSACTION_TYPE_DEPLOY_TEMPLATE": 3,
-	}
-)
-
-func (x SmartContractTransaction_TransactionType) Enum() *SmartContractTransaction_TransactionType {
-	p := new(SmartContractTransaction_TransactionType)
-	*p = x
-	return p
-}
-
-func (x SmartContractTransaction_TransactionType) String() string {
-	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
-}
-
-func (SmartContractTransaction_TransactionType) Descriptor() protoreflect.EnumDescriptor {
-	return file_spacemesh_v1_types_proto_enumTypes[0].Descriptor()
-}
-
-func (SmartContractTransaction_TransactionType) Type() protoreflect.EnumType {
-	return &file_spacemesh_v1_types_proto_enumTypes[0]
-}
-
-func (x SmartContractTransaction_TransactionType) Number() protoreflect.EnumNumber {
-	return protoreflect.EnumNumber(x)
-}
-
-// Deprecated: Use SmartContractTransaction_TransactionType.Descriptor instead.
-func (SmartContractTransaction_TransactionType) EnumDescriptor() ([]byte, []int) {
-	return file_spacemesh_v1_types_proto_rawDescGZIP(), []int{9, 0}
-}
-
-type Signature_Scheme int32
-
-const (
-	Signature_SCHEME_UNSPECIFIED       Signature_Scheme = 0
-	Signature_SCHEME_ED25519           Signature_Scheme = 1 // standard Ed25519 scheme
-	Signature_SCHEME_ED25519_PLUS_PLUS Signature_Scheme = 2 // sm-modified ED25519 , a.k.a. ED25519++
-)
-
-// Enum value maps for Signature_Scheme.
-var (
-	Signature_Scheme_name = map[int32]string{
-		0: "SCHEME_UNSPECIFIED",
-		1: "SCHEME_ED25519",
-		2: "SCHEME_ED25519_PLUS_PLUS",
-	}
-	Signature_Scheme_value = map[string]int32{
-		"SCHEME_UNSPECIFIED":       0,
-		"SCHEME_ED25519":           1,
-		"SCHEME_ED25519_PLUS_PLUS": 2,
-	}
-)
-
-func (x Signature_Scheme) Enum() *Signature_Scheme {
-	p := new(Signature_Scheme)
-	*p = x
-	return p
-}
-
-func (x Signature_Scheme) String() string {
-	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
-}
-
-func (Signature_Scheme) Descriptor() protoreflect.EnumDescriptor {
-	return file_spacemesh_v1_types_proto_enumTypes[1].Descriptor()
-}
-
-func (Signature_Scheme) Type() protoreflect.EnumType {
-	return &file_spacemesh_v1_types_proto_enumTypes[1]
-}
-
-func (x Signature_Scheme) Number() protoreflect.EnumNumber {
-	return protoreflect.EnumNumber(x)
-}
-
-// Deprecated: Use Signature_Scheme.Descriptor instead.
-func (Signature_Scheme) EnumDescriptor() ([]byte, []int) {
-	return file_spacemesh_v1_types_proto_rawDescGZIP(), []int{10, 0}
-}
-
 type Layer_LayerStatus int32
 
 const (
@@ -159,11 +58,11 @@ func (x Layer_LayerStatus) String() string {
 }
 
 func (Layer_LayerStatus) Descriptor() protoreflect.EnumDescriptor {
-	return file_spacemesh_v1_types_proto_enumTypes[2].Descriptor()
+	return file_spacemesh_v1_types_proto_enumTypes[0].Descriptor()
 }
 
 func (Layer_LayerStatus) Type() protoreflect.EnumType {
-	return &file_spacemesh_v1_types_proto_enumTypes[2]
+	return &file_spacemesh_v1_types_proto_enumTypes[0]
 }
 
 func (x Layer_LayerStatus) Number() protoreflect.EnumNumber {
@@ -172,7 +71,7 @@ func (x Layer_LayerStatus) Number() protoreflect.EnumNumber {
 
 // Deprecated: Use Layer_LayerStatus.Descriptor instead.
 func (Layer_LayerStatus) EnumDescriptor() ([]byte, []int) {
-	return file_spacemesh_v1_types_proto_rawDescGZIP(), []int{16, 0}
+	return file_spacemesh_v1_types_proto_rawDescGZIP(), []int{14, 0}
 }
 
 type SimpleInt struct {
@@ -505,17 +404,22 @@ func (x *SmesherId) GetId() []byte {
 	return nil
 }
 
-type GasOffered struct {
+// An Activation "transaction" (ATX)
+type Activation struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	GasProvided uint64 `protobuf:"varint,1,opt,name=gas_provided,json=gasProvided,proto3" json:"gas_provided,omitempty"`
-	GasPrice    uint64 `protobuf:"varint,2,opt,name=gas_price,json=gasPrice,proto3" json:"gas_price,omitempty"`
+	Id        *ActivationId `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	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
 }
 
-func (x *GasOffered) Reset() {
-	*x = GasOffered{}
+func (x *Activation) Reset() {
+	*x = Activation{}
 	if protoimpl.UnsafeEnabled {
 		mi := &file_spacemesh_v1_types_proto_msgTypes[7]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -523,13 +427,13 @@ func (x *GasOffered) Reset() {
 	}
 }
 
-func (x *GasOffered) String() string {
+func (x *Activation) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*GasOffered) ProtoMessage() {}
+func (*Activation) ProtoMessage() {}
 
-func (x *GasOffered) ProtoReflect() protoreflect.Message {
+func (x *Activation) ProtoReflect() protoreflect.Message {
 	mi := &file_spacemesh_v1_types_proto_msgTypes[7]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -541,101 +445,89 @@ func (x *GasOffered) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use GasOffered.ProtoReflect.Descriptor instead.
-func (*GasOffered) Descriptor() ([]byte, []int) {
+// Deprecated: Use Activation.ProtoReflect.Descriptor instead.
+func (*Activation) Descriptor() ([]byte, []int) {
 	return file_spacemesh_v1_types_proto_rawDescGZIP(), []int{7}
 }
 
-func (x *GasOffered) GetGasProvided() uint64 {
+func (x *Activation) GetId() *ActivationId {
 	if x != nil {
-		return x.GasProvided
+		return x.Id
 	}
-	return 0
+	return nil
 }
 
-func (x *GasOffered) GetGasPrice() uint64 {
+func (x *Activation) GetLayer() *LayerNumber {
 	if x != nil {
-		return x.GasPrice
+		return x.Layer
 	}
-	return 0
-}
-
-// Data specific to a simple coin transaction.
-type CoinTransferTransaction struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	Receiver *AccountId `protobuf:"bytes,1,opt,name=receiver,proto3" json:"receiver,omitempty"`
+	return nil
 }
 
-func (x *CoinTransferTransaction) Reset() {
-	*x = CoinTransferTransaction{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_spacemesh_v1_types_proto_msgTypes[8]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
+func (x *Activation) GetSmesherId() *SmesherId {
+	if x != nil {
+		return x.SmesherId
 	}
+	return nil
 }
 
-func (x *CoinTransferTransaction) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*CoinTransferTransaction) ProtoMessage() {}
-
-func (x *CoinTransferTransaction) ProtoReflect() protoreflect.Message {
-	mi := &file_spacemesh_v1_types_proto_msgTypes[8]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
+func (x *Activation) GetCoinbase() *AccountId {
+	if x != nil {
+		return x.Coinbase
 	}
-	return mi.MessageOf(x)
+	return nil
 }
 
-// Deprecated: Use CoinTransferTransaction.ProtoReflect.Descriptor instead.
-func (*CoinTransferTransaction) Descriptor() ([]byte, []int) {
-	return file_spacemesh_v1_types_proto_rawDescGZIP(), []int{8}
+func (x *Activation) GetPrevAtx() *ActivationId {
+	if x != nil {
+		return x.PrevAtx
+	}
+	return nil
 }
 
-func (x *CoinTransferTransaction) GetReceiver() *AccountId {
+func (x *Activation) GetNumUnits() uint32 {
 	if x != nil {
-		return x.Receiver
+		return x.NumUnits
 	}
-	return nil
+	return 0
 }
 
-// Data specific to a smart contract transaction.
-type SmartContractTransaction struct {
+// An immutable Spacemesh transaction.
+// do not include mutable data such as tx state or result.
+type Transaction struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Type      SmartContractTransaction_TransactionType `protobuf:"varint,1,opt,name=type,proto3,enum=spacemesh.v1.SmartContractTransaction_TransactionType" json:"type,omitempty"`
-	Data      []byte                                   `protobuf:"bytes,2,opt,name=data,proto3" json:"data,omitempty"`                            // packed binary arguments, including ABI selector
-	AccountId *AccountId                               `protobuf:"bytes,3,opt,name=account_id,json=accountId,proto3" json:"account_id,omitempty"` // address of smart contract or template
+	Id        []byte       `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	Principal []byte       `protobuf:"bytes,2,opt,name=principal,proto3" json:"principal,omitempty"`
+	Template  []byte       `protobuf:"bytes,3,opt,name=template,proto3" json:"template,omitempty"`
+	Method    uint32       `protobuf:"varint,4,opt,name=method,proto3" json:"method,omitempty"`
+	Nonce     *Nonce       `protobuf:"bytes,5,opt,name=nonce,proto3" json:"nonce,omitempty"`
+	Limits    *LayerLimits `protobuf:"bytes,6,opt,name=limits,proto3" json:"limits,omitempty"`
+	MaxGas    uint64       `protobuf:"varint,7,opt,name=max_gas,json=maxGas,proto3" json:"max_gas,omitempty"`
+	GasPrice  uint64       `protobuf:"varint,8,opt,name=gas_price,json=gasPrice,proto3" json:"gas_price,omitempty"`
+	MaxSpend  uint64       `protobuf:"varint,9,opt,name=max_spend,json=maxSpend,proto3" json:"max_spend,omitempty"`
+	Raw       []byte       `protobuf:"bytes,10,opt,name=raw,proto3" json:"raw,omitempty"`
 }
 
-func (x *SmartContractTransaction) Reset() {
-	*x = SmartContractTransaction{}
+func (x *Transaction) Reset() {
+	*x = Transaction{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_spacemesh_v1_types_proto_msgTypes[9]
+		mi := &file_spacemesh_v1_types_proto_msgTypes[8]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
 }
 
-func (x *SmartContractTransaction) String() string {
+func (x *Transaction) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*SmartContractTransaction) ProtoMessage() {}
+func (*Transaction) ProtoMessage() {}
 
-func (x *SmartContractTransaction) ProtoReflect() protoreflect.Message {
-	mi := &file_spacemesh_v1_types_proto_msgTypes[9]
+func (x *Transaction) ProtoReflect() protoreflect.Message {
+	mi := &file_spacemesh_v1_types_proto_msgTypes[8]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -646,127 +538,107 @@ func (x *SmartContractTransaction) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use SmartContractTransaction.ProtoReflect.Descriptor instead.
-func (*SmartContractTransaction) Descriptor() ([]byte, []int) {
-	return file_spacemesh_v1_types_proto_rawDescGZIP(), []int{9}
+// Deprecated: Use Transaction.ProtoReflect.Descriptor instead.
+func (*Transaction) Descriptor() ([]byte, []int) {
+	return file_spacemesh_v1_types_proto_rawDescGZIP(), []int{8}
 }
 
-func (x *SmartContractTransaction) GetType() SmartContractTransaction_TransactionType {
+func (x *Transaction) GetId() []byte {
 	if x != nil {
-		return x.Type
+		return x.Id
 	}
-	return SmartContractTransaction_TRANSACTION_TYPE_UNSPECIFIED
+	return nil
 }
 
-func (x *SmartContractTransaction) GetData() []byte {
+func (x *Transaction) GetPrincipal() []byte {
 	if x != nil {
-		return x.Data
+		return x.Principal
 	}
 	return nil
 }
 
-func (x *SmartContractTransaction) GetAccountId() *AccountId {
+func (x *Transaction) GetTemplate() []byte {
 	if x != nil {
-		return x.AccountId
+		return x.Template
 	}
 	return nil
 }
 
-// A simple signature data
-type Signature struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	Scheme    Signature_Scheme `protobuf:"varint,1,opt,name=scheme,proto3,enum=spacemesh.v1.Signature_Scheme" json:"scheme,omitempty"` // the signature's scheme
-	Signature []byte           `protobuf:"bytes,2,opt,name=signature,proto3" json:"signature,omitempty"`                               // the signature itself
-	PublicKey []byte           `protobuf:"bytes,3,opt,name=public_key,json=publicKey,proto3" json:"public_key,omitempty"`              // included in schemes which require signer to provide a public key
-}
-
-func (x *Signature) Reset() {
-	*x = Signature{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_spacemesh_v1_types_proto_msgTypes[10]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
+func (x *Transaction) GetMethod() uint32 {
+	if x != nil {
+		return x.Method
 	}
+	return 0
 }
 
-func (x *Signature) String() string {
-	return protoimpl.X.MessageStringOf(x)
+func (x *Transaction) GetNonce() *Nonce {
+	if x != nil {
+		return x.Nonce
+	}
+	return nil
 }
 
-func (*Signature) ProtoMessage() {}
-
-func (x *Signature) ProtoReflect() protoreflect.Message {
-	mi := &file_spacemesh_v1_types_proto_msgTypes[10]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
+func (x *Transaction) GetLimits() *LayerLimits {
+	if x != nil {
+		return x.Limits
 	}
-	return mi.MessageOf(x)
+	return nil
 }
 
-// Deprecated: Use Signature.ProtoReflect.Descriptor instead.
-func (*Signature) Descriptor() ([]byte, []int) {
-	return file_spacemesh_v1_types_proto_rawDescGZIP(), []int{10}
+func (x *Transaction) GetMaxGas() uint64 {
+	if x != nil {
+		return x.MaxGas
+	}
+	return 0
 }
 
-func (x *Signature) GetScheme() Signature_Scheme {
+func (x *Transaction) GetGasPrice() uint64 {
 	if x != nil {
-		return x.Scheme
+		return x.GasPrice
 	}
-	return Signature_SCHEME_UNSPECIFIED
+	return 0
 }
 
-func (x *Signature) GetSignature() []byte {
+func (x *Transaction) GetMaxSpend() uint64 {
 	if x != nil {
-		return x.Signature
+		return x.MaxSpend
 	}
-	return nil
+	return 0
 }
 
-func (x *Signature) GetPublicKey() []byte {
+func (x *Transaction) GetRaw() []byte {
 	if x != nil {
-		return x.PublicKey
+		return x.Raw
 	}
 	return nil
 }
 
-// An Activation "transaction" (ATX)
-type Activation struct {
+type LayerLimits struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Id        *ActivationId `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
-	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
+	Min uint32 `protobuf:"varint,1,opt,name=min,proto3" json:"min,omitempty"`
+	Max uint32 `protobuf:"varint,2,opt,name=max,proto3" json:"max,omitempty"`
 }
 
-func (x *Activation) Reset() {
-	*x = Activation{}
+func (x *LayerLimits) Reset() {
+	*x = LayerLimits{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_spacemesh_v1_types_proto_msgTypes[11]
+		mi := &file_spacemesh_v1_types_proto_msgTypes[9]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
 }
 
-func (x *Activation) String() string {
+func (x *LayerLimits) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*Activation) ProtoMessage() {}
+func (*LayerLimits) ProtoMessage() {}
 
-func (x *Activation) ProtoReflect() protoreflect.Message {
-	mi := &file_spacemesh_v1_types_proto_msgTypes[11]
+func (x *LayerLimits) ProtoReflect() protoreflect.Message {
+	mi := &file_spacemesh_v1_types_proto_msgTypes[9]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -777,89 +649,51 @@ func (x *Activation) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use Activation.ProtoReflect.Descriptor instead.
-func (*Activation) Descriptor() ([]byte, []int) {
-	return file_spacemesh_v1_types_proto_rawDescGZIP(), []int{11}
-}
-
-func (x *Activation) GetId() *ActivationId {
-	if x != nil {
-		return x.Id
-	}
-	return nil
-}
-
-func (x *Activation) GetLayer() *LayerNumber {
-	if x != nil {
-		return x.Layer
-	}
-	return nil
-}
-
-func (x *Activation) GetSmesherId() *SmesherId {
-	if x != nil {
-		return x.SmesherId
-	}
-	return nil
+// Deprecated: Use LayerLimits.ProtoReflect.Descriptor instead.
+func (*LayerLimits) Descriptor() ([]byte, []int) {
+	return file_spacemesh_v1_types_proto_rawDescGZIP(), []int{9}
 }
 
-func (x *Activation) GetCoinbase() *AccountId {
+func (x *LayerLimits) GetMin() uint32 {
 	if x != nil {
-		return x.Coinbase
+		return x.Min
 	}
-	return nil
+	return 0
 }
 
-func (x *Activation) GetPrevAtx() *ActivationId {
+func (x *LayerLimits) GetMax() uint32 {
 	if x != nil {
-		return x.PrevAtx
-	}
-	return nil
-}
-
-func (x *Activation) GetNumUnits() uint32 {
-	if x != nil {
-		return x.NumUnits
+		return x.Max
 	}
 	return 0
 }
 
-// An immutable Spacemesh transaction.
-// do not include mutable data such as tx state or result.
-type Transaction struct {
+type Nonce struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Id *TransactionId `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
-	// Types that are assignable to Datum:
-	//	*Transaction_CoinTransfer
-	//	*Transaction_SmartContract
-	Datum      isTransaction_Datum `protobuf_oneof:"datum"`
-	Sender     *AccountId          `protobuf:"bytes,4,opt,name=sender,proto3" json:"sender,omitempty"`                           // tx originator, should match signer inside Signature
-	GasOffered *GasOffered         `protobuf:"bytes,5,opt,name=gas_offered,json=gasOffered,proto3" json:"gas_offered,omitempty"` // gas price and max gas offered
-	Amount     *Amount             `protobuf:"bytes,6,opt,name=amount,proto3" json:"amount,omitempty"`                           // amount of coin transfered in this tx by sender
-	Counter    uint64              `protobuf:"varint,7,opt,name=counter,proto3" json:"counter,omitempty"`                        // tx counter aka nonce
-	Signature  *Signature          `protobuf:"bytes,8,opt,name=signature,proto3" json:"signature,omitempty"`                     // sender signature on transaction
+	Counter  uint64 `protobuf:"varint,1,opt,name=counter,proto3" json:"counter,omitempty"`
+	Bitfield uint32 `protobuf:"varint,2,opt,name=bitfield,proto3" json:"bitfield,omitempty"` // this is actually limited by uint8, but no type for that.
 }
 
-func (x *Transaction) Reset() {
-	*x = Transaction{}
+func (x *Nonce) Reset() {
+	*x = Nonce{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_spacemesh_v1_types_proto_msgTypes[12]
+		mi := &file_spacemesh_v1_types_proto_msgTypes[10]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
 }
 
-func (x *Transaction) String() string {
+func (x *Nonce) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*Transaction) ProtoMessage() {}
+func (*Nonce) ProtoMessage() {}
 
-func (x *Transaction) ProtoReflect() protoreflect.Message {
-	mi := &file_spacemesh_v1_types_proto_msgTypes[12]
+func (x *Nonce) ProtoReflect() protoreflect.Message {
+	mi := &file_spacemesh_v1_types_proto_msgTypes[10]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -870,90 +704,25 @@ func (x *Transaction) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use Transaction.ProtoReflect.Descriptor instead.
-func (*Transaction) Descriptor() ([]byte, []int) {
-	return file_spacemesh_v1_types_proto_rawDescGZIP(), []int{12}
-}
-
-func (x *Transaction) GetId() *TransactionId {
-	if x != nil {
-		return x.Id
-	}
-	return nil
-}
-
-func (m *Transaction) GetDatum() isTransaction_Datum {
-	if m != nil {
-		return m.Datum
-	}
-	return nil
-}
-
-func (x *Transaction) GetCoinTransfer() *CoinTransferTransaction {
-	if x, ok := x.GetDatum().(*Transaction_CoinTransfer); ok {
-		return x.CoinTransfer
-	}
-	return nil
-}
-
-func (x *Transaction) GetSmartContract() *SmartContractTransaction {
-	if x, ok := x.GetDatum().(*Transaction_SmartContract); ok {
-		return x.SmartContract
-	}
-	return nil
-}
-
-func (x *Transaction) GetSender() *AccountId {
-	if x != nil {
-		return x.Sender
-	}
-	return nil
-}
-
-func (x *Transaction) GetGasOffered() *GasOffered {
-	if x != nil {
-		return x.GasOffered
-	}
-	return nil
-}
-
-func (x *Transaction) GetAmount() *Amount {
-	if x != nil {
-		return x.Amount
-	}
-	return nil
+// Deprecated: Use Nonce.ProtoReflect.Descriptor instead.
+func (*Nonce) Descriptor() ([]byte, []int) {
+	return file_spacemesh_v1_types_proto_rawDescGZIP(), []int{10}
 }
 
-func (x *Transaction) GetCounter() uint64 {
+func (x *Nonce) GetCounter() uint64 {
 	if x != nil {
 		return x.Counter
 	}
 	return 0
 }
 
-func (x *Transaction) GetSignature() *Signature {
+func (x *Nonce) GetBitfield() uint32 {
 	if x != nil {
-		return x.Signature
+		return x.Bitfield
 	}
-	return nil
-}
-
-type isTransaction_Datum interface {
-	isTransaction_Datum()
-}
-
-type Transaction_CoinTransfer struct {
-	CoinTransfer *CoinTransferTransaction `protobuf:"bytes,2,opt,name=coin_transfer,json=coinTransfer,proto3,oneof"`
-}
-
-type Transaction_SmartContract struct {
-	SmartContract *SmartContractTransaction `protobuf:"bytes,3,opt,name=smart_contract,json=smartContract,proto3,oneof"`
+	return 0
 }
 
-func (*Transaction_CoinTransfer) isTransaction_Datum() {}
-
-func (*Transaction_SmartContract) isTransaction_Datum() {}
-
 // Transaction that was added to the mesh.
 type MeshTransaction struct {
 	state         protoimpl.MessageState
@@ -967,7 +736,7 @@ type MeshTransaction struct {
 func (x *MeshTransaction) Reset() {
 	*x = MeshTransaction{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_spacemesh_v1_types_proto_msgTypes[13]
+		mi := &file_spacemesh_v1_types_proto_msgTypes[11]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -980,7 +749,7 @@ func (x *MeshTransaction) String() string {
 func (*MeshTransaction) ProtoMessage() {}
 
 func (x *MeshTransaction) ProtoReflect() protoreflect.Message {
-	mi := &file_spacemesh_v1_types_proto_msgTypes[13]
+	mi := &file_spacemesh_v1_types_proto_msgTypes[11]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -993,7 +762,7 @@ func (x *MeshTransaction) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use MeshTransaction.ProtoReflect.Descriptor instead.
 func (*MeshTransaction) Descriptor() ([]byte, []int) {
-	return file_spacemesh_v1_types_proto_rawDescGZIP(), []int{13}
+	return file_spacemesh_v1_types_proto_rawDescGZIP(), []int{11}
 }
 
 func (x *MeshTransaction) GetTransaction() *Transaction {
@@ -1026,7 +795,7 @@ type Reward struct {
 func (x *Reward) Reset() {
 	*x = Reward{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_spacemesh_v1_types_proto_msgTypes[14]
+		mi := &file_spacemesh_v1_types_proto_msgTypes[12]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1039,7 +808,7 @@ func (x *Reward) String() string {
 func (*Reward) ProtoMessage() {}
 
 func (x *Reward) ProtoReflect() protoreflect.Message {
-	mi := &file_spacemesh_v1_types_proto_msgTypes[14]
+	mi := &file_spacemesh_v1_types_proto_msgTypes[12]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1052,7 +821,7 @@ func (x *Reward) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Reward.ProtoReflect.Descriptor instead.
 func (*Reward) Descriptor() ([]byte, []int) {
-	return file_spacemesh_v1_types_proto_rawDescGZIP(), []int{14}
+	return file_spacemesh_v1_types_proto_rawDescGZIP(), []int{12}
 }
 
 func (x *Reward) GetLayer() *LayerNumber {
@@ -1111,7 +880,7 @@ type Block struct {
 func (x *Block) Reset() {
 	*x = Block{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_spacemesh_v1_types_proto_msgTypes[15]
+		mi := &file_spacemesh_v1_types_proto_msgTypes[13]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1124,7 +893,7 @@ func (x *Block) String() string {
 func (*Block) ProtoMessage() {}
 
 func (x *Block) ProtoReflect() protoreflect.Message {
-	mi := &file_spacemesh_v1_types_proto_msgTypes[15]
+	mi := &file_spacemesh_v1_types_proto_msgTypes[13]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1137,7 +906,7 @@ func (x *Block) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Block.ProtoReflect.Descriptor instead.
 func (*Block) Descriptor() ([]byte, []int) {
-	return file_spacemesh_v1_types_proto_rawDescGZIP(), []int{15}
+	return file_spacemesh_v1_types_proto_rawDescGZIP(), []int{13}
 }
 
 func (x *Block) GetId() []byte {
@@ -1184,7 +953,7 @@ type Layer struct {
 func (x *Layer) Reset() {
 	*x = Layer{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_spacemesh_v1_types_proto_msgTypes[16]
+		mi := &file_spacemesh_v1_types_proto_msgTypes[14]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1197,7 +966,7 @@ func (x *Layer) String() string {
 func (*Layer) ProtoMessage() {}
 
 func (x *Layer) ProtoReflect() protoreflect.Message {
-	mi := &file_spacemesh_v1_types_proto_msgTypes[16]
+	mi := &file_spacemesh_v1_types_proto_msgTypes[14]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1210,7 +979,7 @@ func (x *Layer) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Layer.ProtoReflect.Descriptor instead.
 func (*Layer) Descriptor() ([]byte, []int) {
-	return file_spacemesh_v1_types_proto_rawDescGZIP(), []int{16}
+	return file_spacemesh_v1_types_proto_rawDescGZIP(), []int{14}
 }
 
 func (x *Layer) GetNumber() *LayerNumber {
@@ -1266,7 +1035,7 @@ type LayerNumber struct {
 func (x *LayerNumber) Reset() {
 	*x = LayerNumber{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_spacemesh_v1_types_proto_msgTypes[17]
+		mi := &file_spacemesh_v1_types_proto_msgTypes[15]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1279,7 +1048,7 @@ func (x *LayerNumber) String() string {
 func (*LayerNumber) ProtoMessage() {}
 
 func (x *LayerNumber) ProtoReflect() protoreflect.Message {
-	mi := &file_spacemesh_v1_types_proto_msgTypes[17]
+	mi := &file_spacemesh_v1_types_proto_msgTypes[15]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1292,7 +1061,7 @@ func (x *LayerNumber) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use LayerNumber.ProtoReflect.Descriptor instead.
 func (*LayerNumber) Descriptor() ([]byte, []int) {
-	return file_spacemesh_v1_types_proto_rawDescGZIP(), []int{17}
+	return file_spacemesh_v1_types_proto_rawDescGZIP(), []int{15}
 }
 
 func (x *LayerNumber) GetNumber() uint32 {
@@ -1314,7 +1083,7 @@ type AppEvent struct {
 func (x *AppEvent) Reset() {
 	*x = AppEvent{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_spacemesh_v1_types_proto_msgTypes[18]
+		mi := &file_spacemesh_v1_types_proto_msgTypes[16]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1327,7 +1096,7 @@ func (x *AppEvent) String() string {
 func (*AppEvent) ProtoMessage() {}
 
 func (x *AppEvent) ProtoReflect() protoreflect.Message {
-	mi := &file_spacemesh_v1_types_proto_msgTypes[18]
+	mi := &file_spacemesh_v1_types_proto_msgTypes[16]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1340,7 +1109,7 @@ func (x *AppEvent) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use AppEvent.ProtoReflect.Descriptor instead.
 func (*AppEvent) Descriptor() ([]byte, []int) {
-	return file_spacemesh_v1_types_proto_rawDescGZIP(), []int{18}
+	return file_spacemesh_v1_types_proto_rawDescGZIP(), []int{16}
 }
 
 func (x *AppEvent) GetTransactionId() *TransactionId {
@@ -1377,178 +1146,131 @@ var file_spacemesh_v1_types_proto_rawDesc = []byte{
 	0x69, 0x76, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x49, 0x64, 0x12, 0x0e, 0x0a, 0x02, 0x69, 0x64, 0x18,
 	0x01, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x02, 0x69, 0x64, 0x22, 0x1b, 0x0a, 0x09, 0x53, 0x6d, 0x65,
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 }
 
 var (
@@ -1563,70 +1285,57 @@ func file_spacemesh_v1_types_proto_rawDescGZIP() []byte {
 	return file_spacemesh_v1_types_proto_rawDescData
 }
 
-var file_spacemesh_v1_types_proto_enumTypes = make([]protoimpl.EnumInfo, 3)
-var file_spacemesh_v1_types_proto_msgTypes = make([]protoimpl.MessageInfo, 19)
+var file_spacemesh_v1_types_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
+var file_spacemesh_v1_types_proto_msgTypes = make([]protoimpl.MessageInfo, 17)
 var file_spacemesh_v1_types_proto_goTypes = []interface{}{
-	(SmartContractTransaction_TransactionType)(0), // 0: spacemesh.v1.SmartContractTransaction.TransactionType
-	(Signature_Scheme)(0),                         // 1: spacemesh.v1.Signature.Scheme
-	(Layer_LayerStatus)(0),                        // 2: spacemesh.v1.Layer.LayerStatus
-	(*SimpleInt)(nil),                             // 3: spacemesh.v1.SimpleInt
-	(*SimpleString)(nil),                          // 4: spacemesh.v1.SimpleString
-	(*Amount)(nil),                                // 5: spacemesh.v1.Amount
-	(*AccountId)(nil),                             // 6: spacemesh.v1.AccountId
-	(*TransactionId)(nil),                         // 7: spacemesh.v1.TransactionId
-	(*ActivationId)(nil),                          // 8: spacemesh.v1.ActivationId
-	(*SmesherId)(nil),                             // 9: spacemesh.v1.SmesherId
-	(*GasOffered)(nil),                            // 10: spacemesh.v1.GasOffered
-	(*CoinTransferTransaction)(nil),               // 11: spacemesh.v1.CoinTransferTransaction
-	(*SmartContractTransaction)(nil),              // 12: spacemesh.v1.SmartContractTransaction
-	(*Signature)(nil),                             // 13: spacemesh.v1.Signature
-	(*Activation)(nil),                            // 14: spacemesh.v1.Activation
-	(*Transaction)(nil),                           // 15: spacemesh.v1.Transaction
-	(*MeshTransaction)(nil),                       // 16: spacemesh.v1.MeshTransaction
-	(*Reward)(nil),                                // 17: spacemesh.v1.Reward
-	(*Block)(nil),                                 // 18: spacemesh.v1.Block
-	(*Layer)(nil),                                 // 19: spacemesh.v1.Layer
-	(*LayerNumber)(nil),                           // 20: spacemesh.v1.LayerNumber
-	(*AppEvent)(nil),                              // 21: spacemesh.v1.AppEvent
+	(Layer_LayerStatus)(0),  // 0: spacemesh.v1.Layer.LayerStatus
+	(*SimpleInt)(nil),       // 1: spacemesh.v1.SimpleInt
+	(*SimpleString)(nil),    // 2: spacemesh.v1.SimpleString
+	(*Amount)(nil),          // 3: spacemesh.v1.Amount
+	(*AccountId)(nil),       // 4: spacemesh.v1.AccountId
+	(*TransactionId)(nil),   // 5: spacemesh.v1.TransactionId
+	(*ActivationId)(nil),    // 6: spacemesh.v1.ActivationId
+	(*SmesherId)(nil),       // 7: spacemesh.v1.SmesherId
+	(*Activation)(nil),      // 8: spacemesh.v1.Activation
+	(*Transaction)(nil),     // 9: spacemesh.v1.Transaction
+	(*LayerLimits)(nil),     // 10: spacemesh.v1.LayerLimits
+	(*Nonce)(nil),           // 11: spacemesh.v1.Nonce
+	(*MeshTransaction)(nil), // 12: spacemesh.v1.MeshTransaction
+	(*Reward)(nil),          // 13: spacemesh.v1.Reward
+	(*Block)(nil),           // 14: spacemesh.v1.Block
+	(*Layer)(nil),           // 15: spacemesh.v1.Layer
+	(*LayerNumber)(nil),     // 16: spacemesh.v1.LayerNumber
+	(*AppEvent)(nil),        // 17: spacemesh.v1.AppEvent
 }
 var file_spacemesh_v1_types_proto_depIdxs = []int32{
-	6,  // 0: spacemesh.v1.CoinTransferTransaction.receiver:type_name -> spacemesh.v1.AccountId
-	0,  // 1: spacemesh.v1.SmartContractTransaction.type:type_name -> spacemesh.v1.SmartContractTransaction.TransactionType
-	6,  // 2: spacemesh.v1.SmartContractTransaction.account_id:type_name -> spacemesh.v1.AccountId
-	1,  // 3: spacemesh.v1.Signature.scheme:type_name -> spacemesh.v1.Signature.Scheme
-	8,  // 4: spacemesh.v1.Activation.id:type_name -> spacemesh.v1.ActivationId
-	20, // 5: spacemesh.v1.Activation.layer:type_name -> spacemesh.v1.LayerNumber
-	9,  // 6: spacemesh.v1.Activation.smesher_id:type_name -> spacemesh.v1.SmesherId
-	6,  // 7: spacemesh.v1.Activation.coinbase:type_name -> spacemesh.v1.AccountId
-	8,  // 8: spacemesh.v1.Activation.prev_atx:type_name -> spacemesh.v1.ActivationId
-	7,  // 9: spacemesh.v1.Transaction.id:type_name -> spacemesh.v1.TransactionId
-	11, // 10: spacemesh.v1.Transaction.coin_transfer:type_name -> spacemesh.v1.CoinTransferTransaction
-	12, // 11: spacemesh.v1.Transaction.smart_contract:type_name -> spacemesh.v1.SmartContractTransaction
-	6,  // 12: spacemesh.v1.Transaction.sender:type_name -> spacemesh.v1.AccountId
-	10, // 13: spacemesh.v1.Transaction.gas_offered:type_name -> spacemesh.v1.GasOffered
-	5,  // 14: spacemesh.v1.Transaction.amount:type_name -> spacemesh.v1.Amount
-	13, // 15: spacemesh.v1.Transaction.signature:type_name -> spacemesh.v1.Signature
-	15, // 16: spacemesh.v1.MeshTransaction.transaction:type_name -> spacemesh.v1.Transaction
-	20, // 17: spacemesh.v1.MeshTransaction.layer_id:type_name -> spacemesh.v1.LayerNumber
-	20, // 18: spacemesh.v1.Reward.layer:type_name -> spacemesh.v1.LayerNumber
-	5,  // 19: spacemesh.v1.Reward.total:type_name -> spacemesh.v1.Amount
-	5,  // 20: spacemesh.v1.Reward.layer_reward:type_name -> spacemesh.v1.Amount
-	20, // 21: spacemesh.v1.Reward.layer_computed:type_name -> spacemesh.v1.LayerNumber
-	6,  // 22: spacemesh.v1.Reward.coinbase:type_name -> spacemesh.v1.AccountId
-	9,  // 23: spacemesh.v1.Reward.smesher:type_name -> spacemesh.v1.SmesherId
-	15, // 24: spacemesh.v1.Block.transactions:type_name -> spacemesh.v1.Transaction
-	8,  // 25: spacemesh.v1.Block.activation_id:type_name -> spacemesh.v1.ActivationId
-	9,  // 26: spacemesh.v1.Block.smesher_id:type_name -> spacemesh.v1.SmesherId
-	20, // 27: spacemesh.v1.Layer.number:type_name -> spacemesh.v1.LayerNumber
-	2,  // 28: spacemesh.v1.Layer.status:type_name -> spacemesh.v1.Layer.LayerStatus
-	18, // 29: spacemesh.v1.Layer.blocks:type_name -> spacemesh.v1.Block
-	14, // 30: spacemesh.v1.Layer.activations:type_name -> spacemesh.v1.Activation
-	7,  // 31: spacemesh.v1.AppEvent.transaction_id:type_name -> spacemesh.v1.TransactionId
-	32, // [32:32] is the sub-list for method output_type
-	32, // [32:32] is the sub-list for method input_type
-	32, // [32:32] is the sub-list for extension type_name
-	32, // [32:32] is the sub-list for extension extendee
-	0,  // [0:32] is the sub-list for field type_name
+	6,  // 0: spacemesh.v1.Activation.id:type_name -> spacemesh.v1.ActivationId
+	16, // 1: spacemesh.v1.Activation.layer:type_name -> spacemesh.v1.LayerNumber
+	7,  // 2: spacemesh.v1.Activation.smesher_id:type_name -> spacemesh.v1.SmesherId
+	4,  // 3: spacemesh.v1.Activation.coinbase:type_name -> spacemesh.v1.AccountId
+	6,  // 4: spacemesh.v1.Activation.prev_atx:type_name -> spacemesh.v1.ActivationId
+	11, // 5: spacemesh.v1.Transaction.nonce:type_name -> spacemesh.v1.Nonce
+	10, // 6: spacemesh.v1.Transaction.limits:type_name -> spacemesh.v1.LayerLimits
+	9,  // 7: spacemesh.v1.MeshTransaction.transaction:type_name -> spacemesh.v1.Transaction
+	16, // 8: spacemesh.v1.MeshTransaction.layer_id:type_name -> spacemesh.v1.LayerNumber
+	16, // 9: spacemesh.v1.Reward.layer:type_name -> spacemesh.v1.LayerNumber
+	3,  // 10: spacemesh.v1.Reward.total:type_name -> spacemesh.v1.Amount
+	3,  // 11: spacemesh.v1.Reward.layer_reward:type_name -> spacemesh.v1.Amount
+	16, // 12: spacemesh.v1.Reward.layer_computed:type_name -> spacemesh.v1.LayerNumber
+	4,  // 13: spacemesh.v1.Reward.coinbase:type_name -> spacemesh.v1.AccountId
+	7,  // 14: spacemesh.v1.Reward.smesher:type_name -> spacemesh.v1.SmesherId
+	9,  // 15: spacemesh.v1.Block.transactions:type_name -> spacemesh.v1.Transaction
+	6,  // 16: spacemesh.v1.Block.activation_id:type_name -> spacemesh.v1.ActivationId
+	7,  // 17: spacemesh.v1.Block.smesher_id:type_name -> spacemesh.v1.SmesherId
+	16, // 18: spacemesh.v1.Layer.number:type_name -> spacemesh.v1.LayerNumber
+	0,  // 19: spacemesh.v1.Layer.status:type_name -> spacemesh.v1.Layer.LayerStatus
+	14, // 20: spacemesh.v1.Layer.blocks:type_name -> spacemesh.v1.Block
+	8,  // 21: spacemesh.v1.Layer.activations:type_name -> spacemesh.v1.Activation
+	5,  // 22: spacemesh.v1.AppEvent.transaction_id:type_name -> spacemesh.v1.TransactionId
+	23, // [23:23] is the sub-list for method output_type
+	23, // [23:23] is the sub-list for method input_type
+	23, // [23:23] is the sub-list for extension type_name
+	23, // [23:23] is the sub-list for extension extendee
+	0,  // [0:23] is the sub-list for field type_name
 }
 
 func init() { file_spacemesh_v1_types_proto_init() }
@@ -1720,7 +1429,7 @@ func file_spacemesh_v1_types_proto_init() {
 			}
 		}
 		file_spacemesh_v1_types_proto_msgTypes[7].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*GasOffered); i {
+			switch v := v.(*Activation); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1732,7 +1441,7 @@ func file_spacemesh_v1_types_proto_init() {
 			}
 		}
 		file_spacemesh_v1_types_proto_msgTypes[8].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*CoinTransferTransaction); i {
+			switch v := v.(*Transaction); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1744,7 +1453,7 @@ func file_spacemesh_v1_types_proto_init() {
 			}
 		}
 		file_spacemesh_v1_types_proto_msgTypes[9].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SmartContractTransaction); i {
+			switch v := v.(*LayerLimits); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1756,7 +1465,7 @@ func file_spacemesh_v1_types_proto_init() {
 			}
 		}
 		file_spacemesh_v1_types_proto_msgTypes[10].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Signature); i {
+			switch v := v.(*Nonce); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1768,30 +1477,6 @@ func file_spacemesh_v1_types_proto_init() {
 			}
 		}
 		file_spacemesh_v1_types_proto_msgTypes[11].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Activation); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_spacemesh_v1_types_proto_msgTypes[12].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Transaction); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_spacemesh_v1_types_proto_msgTypes[13].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*MeshTransaction); i {
 			case 0:
 				return &v.state
@@ -1803,7 +1488,7 @@ func file_spacemesh_v1_types_proto_init() {
 				return nil
 			}
 		}
-		file_spacemesh_v1_types_proto_msgTypes[14].Exporter = func(v interface{}, i int) interface{} {
+		file_spacemesh_v1_types_proto_msgTypes[12].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*Reward); i {
 			case 0:
 				return &v.state
@@ -1815,7 +1500,7 @@ func file_spacemesh_v1_types_proto_init() {
 				return nil
 			}
 		}
-		file_spacemesh_v1_types_proto_msgTypes[15].Exporter = func(v interface{}, i int) interface{} {
+		file_spacemesh_v1_types_proto_msgTypes[13].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*Block); i {
 			case 0:
 				return &v.state
@@ -1827,7 +1512,7 @@ func file_spacemesh_v1_types_proto_init() {
 				return nil
 			}
 		}
-		file_spacemesh_v1_types_proto_msgTypes[16].Exporter = func(v interface{}, i int) interface{} {
+		file_spacemesh_v1_types_proto_msgTypes[14].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*Layer); i {
 			case 0:
 				return &v.state
@@ -1839,7 +1524,7 @@ func file_spacemesh_v1_types_proto_init() {
 				return nil
 			}
 		}
-		file_spacemesh_v1_types_proto_msgTypes[17].Exporter = func(v interface{}, i int) interface{} {
+		file_spacemesh_v1_types_proto_msgTypes[15].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*LayerNumber); i {
 			case 0:
 				return &v.state
@@ -1851,7 +1536,7 @@ func file_spacemesh_v1_types_proto_init() {
 				return nil
 			}
 		}
-		file_spacemesh_v1_types_proto_msgTypes[18].Exporter = func(v interface{}, i int) interface{} {
+		file_spacemesh_v1_types_proto_msgTypes[16].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*AppEvent); i {
 			case 0:
 				return &v.state
@@ -1864,17 +1549,13 @@ func file_spacemesh_v1_types_proto_init() {
 			}
 		}
 	}
-	file_spacemesh_v1_types_proto_msgTypes[12].OneofWrappers = []interface{}{
-		(*Transaction_CoinTransfer)(nil),
-		(*Transaction_SmartContract)(nil),
-	}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_spacemesh_v1_types_proto_rawDesc,
-			NumEnums:      3,
-			NumMessages:   19,
+			NumEnums:      1,
+			NumMessages:   17,
 			NumExtensions: 0,
 			NumServices:   0,
 		},