proto: add initial protocol definitions

go.mod

@@ -1,3 +1,8 @@
 module github.com/gtank/ctxd
 
-require github.com/pkg/errors v0.8.0
+require (
+	github.com/golang/protobuf v1.2.0
+	github.com/pkg/errors v0.8.0
+	golang.org/x/net v0.0.0-20180926154720-4dfa2610cdf3 // indirect
+	golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f // indirect
+)

go.sum

@@ -1,2 +1,8 @@
+github.com/golang/protobuf v1.2.0 h1:P3YflyNX/ehuJFLhxviNdFxQPkGK5cDcApsge1SqnvM=
+github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/pkg/errors v0.8.0 h1:WdK/asTD0HN+q6hsWO3/vpuAkAr+tw6aNJNDFFf0+qw=
 github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+golang.org/x/net v0.0.0-20180926154720-4dfa2610cdf3 h1:dgd4x4kJt7G4k4m93AYLzM8Ni6h2qLTfh9n9vXJT3/0=
+golang.org/x/net v0.0.0-20180926154720-4dfa2610cdf3/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f h1:wMNYb4v58l5UBM7MYRLPG6ZhfOqbKu7X5eyFl8ZhKvA=
+golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=

proto/compact_formats.pb.go

@@ -0,0 +1,507 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: compact_formats.proto
+
+package proto
+
+import proto "github.com/golang/protobuf/proto"
+import fmt "fmt"
+import math "math"
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion2 // please upgrade the proto package
+
+// A BlockFilter message contains identifiers to select a block: either a
+// height or a hash.
+type BlockFilter struct {
+	BlockHeight          uint64   `protobuf:"varint,1,opt,name=blockHeight,proto3" json:"blockHeight,omitempty"`
+	BlockHash            []byte   `protobuf:"bytes,2,opt,name=blockHash,proto3" json:"blockHash,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *BlockFilter) Reset()         { *m = BlockFilter{} }
+func (m *BlockFilter) String() string { return proto.CompactTextString(m) }
+func (*BlockFilter) ProtoMessage()    {}
+func (*BlockFilter) Descriptor() ([]byte, []int) {
+	return fileDescriptor_compact_formats_0da157b93a4fa3be, []int{0}
+}
+func (m *BlockFilter) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_BlockFilter.Unmarshal(m, b)
+}
+func (m *BlockFilter) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_BlockFilter.Marshal(b, m, deterministic)
+}
+func (dst *BlockFilter) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_BlockFilter.Merge(dst, src)
+}
+func (m *BlockFilter) XXX_Size() int {
+	return xxx_messageInfo_BlockFilter.Size(m)
+}
+func (m *BlockFilter) XXX_DiscardUnknown() {
+	xxx_messageInfo_BlockFilter.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_BlockFilter proto.InternalMessageInfo
+
+func (m *BlockFilter) GetBlockHeight() uint64 {
+	if m != nil {
+		return m.BlockHeight
+	}
+	return 0
+}
+
+func (m *BlockFilter) GetBlockHash() []byte {
+	if m != nil {
+		return m.BlockHash
+	}
+	return nil
+}
+
+type RangeFilter struct {
+	Start                *BlockFilter `protobuf:"bytes,1,opt,name=start,proto3" json:"start,omitempty"`
+	End                  *BlockFilter `protobuf:"bytes,2,opt,name=end,proto3" json:"end,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}     `json:"-"`
+	XXX_unrecognized     []byte       `json:"-"`
+	XXX_sizecache        int32        `json:"-"`
+}
+
+func (m *RangeFilter) Reset()         { *m = RangeFilter{} }
+func (m *RangeFilter) String() string { return proto.CompactTextString(m) }
+func (*RangeFilter) ProtoMessage()    {}
+func (*RangeFilter) Descriptor() ([]byte, []int) {
+	return fileDescriptor_compact_formats_0da157b93a4fa3be, []int{1}
+}
+func (m *RangeFilter) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_RangeFilter.Unmarshal(m, b)
+}
+func (m *RangeFilter) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_RangeFilter.Marshal(b, m, deterministic)
+}
+func (dst *RangeFilter) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_RangeFilter.Merge(dst, src)
+}
+func (m *RangeFilter) XXX_Size() int {
+	return xxx_messageInfo_RangeFilter.Size(m)
+}
+func (m *RangeFilter) XXX_DiscardUnknown() {
+	xxx_messageInfo_RangeFilter.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_RangeFilter proto.InternalMessageInfo
+
+func (m *RangeFilter) GetStart() *BlockFilter {
+	if m != nil {
+		return m.Start
+	}
+	return nil
+}
+
+func (m *RangeFilter) GetEnd() *BlockFilter {
+	if m != nil {
+		return m.End
+	}
+	return nil
+}
+
+// A TxFilter contains the information needed to identify a particular
+// transaction: either a block and an index, or a direct transaction hash.
+type TxFilter struct {
+	BlockID              *BlockFilter `protobuf:"bytes,1,opt,name=blockID,proto3" json:"blockID,omitempty"`
+	TxIndex              uint64       `protobuf:"varint,2,opt,name=txIndex,proto3" json:"txIndex,omitempty"`
+	TxHash               []byte       `protobuf:"bytes,3,opt,name=txHash,proto3" json:"txHash,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}     `json:"-"`
+	XXX_unrecognized     []byte       `json:"-"`
+	XXX_sizecache        int32        `json:"-"`
+}
+
+func (m *TxFilter) Reset()         { *m = TxFilter{} }
+func (m *TxFilter) String() string { return proto.CompactTextString(m) }
+func (*TxFilter) ProtoMessage()    {}
+func (*TxFilter) Descriptor() ([]byte, []int) {
+	return fileDescriptor_compact_formats_0da157b93a4fa3be, []int{2}
+}
+func (m *TxFilter) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_TxFilter.Unmarshal(m, b)
+}
+func (m *TxFilter) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_TxFilter.Marshal(b, m, deterministic)
+}
+func (dst *TxFilter) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_TxFilter.Merge(dst, src)
+}
+func (m *TxFilter) XXX_Size() int {
+	return xxx_messageInfo_TxFilter.Size(m)
+}
+func (m *TxFilter) XXX_DiscardUnknown() {
+	xxx_messageInfo_TxFilter.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_TxFilter proto.InternalMessageInfo
+
+func (m *TxFilter) GetBlockID() *BlockFilter {
+	if m != nil {
+		return m.BlockID
+	}
+	return nil
+}
+
+func (m *TxFilter) GetTxIndex() uint64 {
+	if m != nil {
+		return m.TxIndex
+	}
+	return 0
+}
+
+func (m *TxFilter) GetTxHash() []byte {
+	if m != nil {
+		return m.TxHash
+	}
+	return nil
+}
+
+// CompactBlock is a packaging of ONLY the data from a block that's needed to:
+//   1. Detect a payment to your shielded Sapling address
+//   2. Detect a spend of your shielded Sapling notes
+//   3. Update your witnesses to generate new Sapling spend proofs.
+type CompactBlock struct {
+	BlockID              *BlockFilter `protobuf:"bytes,1,opt,name=blockID,proto3" json:"blockID,omitempty"`
+	Vtx                  []*CompactTx `protobuf:"bytes,3,rep,name=vtx,proto3" json:"vtx,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}     `json:"-"`
+	XXX_unrecognized     []byte       `json:"-"`
+	XXX_sizecache        int32        `json:"-"`
+}
+
+func (m *CompactBlock) Reset()         { *m = CompactBlock{} }
+func (m *CompactBlock) String() string { return proto.CompactTextString(m) }
+func (*CompactBlock) ProtoMessage()    {}
+func (*CompactBlock) Descriptor() ([]byte, []int) {
+	return fileDescriptor_compact_formats_0da157b93a4fa3be, []int{3}
+}
+func (m *CompactBlock) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_CompactBlock.Unmarshal(m, b)
+}
+func (m *CompactBlock) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_CompactBlock.Marshal(b, m, deterministic)
+}
+func (dst *CompactBlock) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_CompactBlock.Merge(dst, src)
+}
+func (m *CompactBlock) XXX_Size() int {
+	return xxx_messageInfo_CompactBlock.Size(m)
+}
+func (m *CompactBlock) XXX_DiscardUnknown() {
+	xxx_messageInfo_CompactBlock.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_CompactBlock proto.InternalMessageInfo
+
+func (m *CompactBlock) GetBlockID() *BlockFilter {
+	if m != nil {
+		return m.BlockID
+	}
+	return nil
+}
+
+func (m *CompactBlock) GetVtx() []*CompactTx {
+	if m != nil {
+		return m.Vtx
+	}
+	return nil
+}
+
+type CompactTx struct {
+	// Index and hash will allow the receiver to call out to chain
+	// explorers or other data structures to retrieve more information
+	// about this transaction.
+	Index                uint64           `protobuf:"varint,1,opt,name=index,proto3" json:"index,omitempty"`
+	Hash                 []byte           `protobuf:"bytes,2,opt,name=hash,proto3" json:"hash,omitempty"`
+	Spends               []*CompactSpend  `protobuf:"bytes,3,rep,name=spends,proto3" json:"spends,omitempty"`
+	Outputs              []*CompactOutput `protobuf:"bytes,4,rep,name=outputs,proto3" json:"outputs,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}         `json:"-"`
+	XXX_unrecognized     []byte           `json:"-"`
+	XXX_sizecache        int32            `json:"-"`
+}
+
+func (m *CompactTx) Reset()         { *m = CompactTx{} }
+func (m *CompactTx) String() string { return proto.CompactTextString(m) }
+func (*CompactTx) ProtoMessage()    {}
+func (*CompactTx) Descriptor() ([]byte, []int) {
+	return fileDescriptor_compact_formats_0da157b93a4fa3be, []int{4}
+}
+func (m *CompactTx) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_CompactTx.Unmarshal(m, b)
+}
+func (m *CompactTx) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_CompactTx.Marshal(b, m, deterministic)
+}
+func (dst *CompactTx) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_CompactTx.Merge(dst, src)
+}
+func (m *CompactTx) XXX_Size() int {
+	return xxx_messageInfo_CompactTx.Size(m)
+}
+func (m *CompactTx) XXX_DiscardUnknown() {
+	xxx_messageInfo_CompactTx.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_CompactTx proto.InternalMessageInfo
+
+func (m *CompactTx) GetIndex() uint64 {
+	if m != nil {
+		return m.Index
+	}
+	return 0
+}
+
+func (m *CompactTx) GetHash() []byte {
+	if m != nil {
+		return m.Hash
+	}
+	return nil
+}
+
+func (m *CompactTx) GetSpends() []*CompactSpend {
+	if m != nil {
+		return m.Spends
+	}
+	return nil
+}
+
+func (m *CompactTx) GetOutputs() []*CompactOutput {
+	if m != nil {
+		return m.Outputs
+	}
+	return nil
+}
+
+type CompactSpend struct {
+	Nf                   []byte   `protobuf:"bytes,1,opt,name=nf,proto3" json:"nf,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *CompactSpend) Reset()         { *m = CompactSpend{} }
+func (m *CompactSpend) String() string { return proto.CompactTextString(m) }
+func (*CompactSpend) ProtoMessage()    {}
+func (*CompactSpend) Descriptor() ([]byte, []int) {
+	return fileDescriptor_compact_formats_0da157b93a4fa3be, []int{5}
+}
+func (m *CompactSpend) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_CompactSpend.Unmarshal(m, b)
+}
+func (m *CompactSpend) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_CompactSpend.Marshal(b, m, deterministic)
+}
+func (dst *CompactSpend) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_CompactSpend.Merge(dst, src)
+}
+func (m *CompactSpend) XXX_Size() int {
+	return xxx_messageInfo_CompactSpend.Size(m)
+}
+func (m *CompactSpend) XXX_DiscardUnknown() {
+	xxx_messageInfo_CompactSpend.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_CompactSpend proto.InternalMessageInfo
+
+func (m *CompactSpend) GetNf() []byte {
+	if m != nil {
+		return m.Nf
+	}
+	return nil
+}
+
+type CompactOutput struct {
+	Cmu                  []byte   `protobuf:"bytes,1,opt,name=cmu,proto3" json:"cmu,omitempty"`
+	Epk                  []byte   `protobuf:"bytes,2,opt,name=epk,proto3" json:"epk,omitempty"`
+	Ciphertext           []byte   `protobuf:"bytes,3,opt,name=ciphertext,proto3" json:"ciphertext,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *CompactOutput) Reset()         { *m = CompactOutput{} }
+func (m *CompactOutput) String() string { return proto.CompactTextString(m) }
+func (*CompactOutput) ProtoMessage()    {}
+func (*CompactOutput) Descriptor() ([]byte, []int) {
+	return fileDescriptor_compact_formats_0da157b93a4fa3be, []int{6}
+}
+func (m *CompactOutput) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_CompactOutput.Unmarshal(m, b)
+}
+func (m *CompactOutput) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_CompactOutput.Marshal(b, m, deterministic)
+}
+func (dst *CompactOutput) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_CompactOutput.Merge(dst, src)
+}
+func (m *CompactOutput) XXX_Size() int {
+	return xxx_messageInfo_CompactOutput.Size(m)
+}
+func (m *CompactOutput) XXX_DiscardUnknown() {
+	xxx_messageInfo_CompactOutput.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_CompactOutput proto.InternalMessageInfo
+
+func (m *CompactOutput) GetCmu() []byte {
+	if m != nil {
+		return m.Cmu
+	}
+	return nil
+}
+
+func (m *CompactOutput) GetEpk() []byte {
+	if m != nil {
+		return m.Epk
+	}
+	return nil
+}
+
+func (m *CompactOutput) GetCiphertext() []byte {
+	if m != nil {
+		return m.Ciphertext
+	}
+	return nil
+}
+
+// An opaque blob of full transaction data, for fetching anything that is not
+// in the compact format (e.g. the memo field).
+type FullTransaction struct {
+	TxID                 *TxFilter `protobuf:"bytes,1,opt,name=txID,proto3" json:"txID,omitempty"`
+	Data                 []byte    `protobuf:"bytes,2,opt,name=data,proto3" json:"data,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}  `json:"-"`
+	XXX_unrecognized     []byte    `json:"-"`
+	XXX_sizecache        int32     `json:"-"`
+}
+
+func (m *FullTransaction) Reset()         { *m = FullTransaction{} }
+func (m *FullTransaction) String() string { return proto.CompactTextString(m) }
+func (*FullTransaction) ProtoMessage()    {}
+func (*FullTransaction) Descriptor() ([]byte, []int) {
+	return fileDescriptor_compact_formats_0da157b93a4fa3be, []int{7}
+}
+func (m *FullTransaction) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_FullTransaction.Unmarshal(m, b)
+}
+func (m *FullTransaction) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_FullTransaction.Marshal(b, m, deterministic)
+}
+func (dst *FullTransaction) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_FullTransaction.Merge(dst, src)
+}
+func (m *FullTransaction) XXX_Size() int {
+	return xxx_messageInfo_FullTransaction.Size(m)
+}
+func (m *FullTransaction) XXX_DiscardUnknown() {
+	xxx_messageInfo_FullTransaction.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_FullTransaction proto.InternalMessageInfo
+
+func (m *FullTransaction) GetTxID() *TxFilter {
+	if m != nil {
+		return m.TxID
+	}
+	return nil
+}
+
+func (m *FullTransaction) GetData() []byte {
+	if m != nil {
+		return m.Data
+	}
+	return nil
+}
+
+// Empty placeholder.
+// Someday we may want to specify e.g. a particular chain fork.
+type ChainSpec struct {
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *ChainSpec) Reset()         { *m = ChainSpec{} }
+func (m *ChainSpec) String() string { return proto.CompactTextString(m) }
+func (*ChainSpec) ProtoMessage()    {}
+func (*ChainSpec) Descriptor() ([]byte, []int) {
+	return fileDescriptor_compact_formats_0da157b93a4fa3be, []int{8}
+}
+func (m *ChainSpec) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ChainSpec.Unmarshal(m, b)
+}
+func (m *ChainSpec) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ChainSpec.Marshal(b, m, deterministic)
+}
+func (dst *ChainSpec) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ChainSpec.Merge(dst, src)
+}
+func (m *ChainSpec) XXX_Size() int {
+	return xxx_messageInfo_ChainSpec.Size(m)
+}
+func (m *ChainSpec) XXX_DiscardUnknown() {
+	xxx_messageInfo_ChainSpec.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ChainSpec proto.InternalMessageInfo
+
+func init() {
+	proto.RegisterType((*BlockFilter)(nil), "proto.BlockFilter")
+	proto.RegisterType((*RangeFilter)(nil), "proto.RangeFilter")
+	proto.RegisterType((*TxFilter)(nil), "proto.TxFilter")
+	proto.RegisterType((*CompactBlock)(nil), "proto.CompactBlock")
+	proto.RegisterType((*CompactTx)(nil), "proto.CompactTx")
+	proto.RegisterType((*CompactSpend)(nil), "proto.CompactSpend")
+	proto.RegisterType((*CompactOutput)(nil), "proto.CompactOutput")
+	proto.RegisterType((*FullTransaction)(nil), "proto.FullTransaction")
+	proto.RegisterType((*ChainSpec)(nil), "proto.ChainSpec")
+}
+
+func init() {
+	proto.RegisterFile("compact_formats.proto", fileDescriptor_compact_formats_0da157b93a4fa3be)
+}
+
+var fileDescriptor_compact_formats_0da157b93a4fa3be = []byte{
+	// 485 bytes of a gzipped FileDescriptorProto
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+	0xfc, 0xb2, 0xa0, 0x5f, 0x97, 0xf0, 0x14, 0x3a, 0x21, 0xef, 0x57, 0x9a, 0x5e, 0x26, 0x88, 0xe0,
+	0x04, 0xf7, 0x4e, 0x73, 0x8c, 0xcf, 0xa0, 0x9b, 0x25, 0x3a, 0x5a, 0x64, 0x46, 0xfe, 0xe1, 0xb6,
+	0xfc, 0xac, 0xc0, 0xa4, 0xa1, 0xe0, 0x04, 0x7a, 0xf1, 0x86, 0x92, 0x0d, 0x65, 0x9e, 0xc3, 0xec,
+	0xd3, 0x6d, 0xf6, 0x17, 0x06, 0x65, 0x45, 0x12, 0xe7, 0xf5, 0xb3, 0x59, 0x07, 0x8f, 0xa0, 0x1d,
+	0x2d, 0x79, 0xa7, 0x81, 0x6c, 0x47, 0x4b, 0x31, 0x83, 0xc3, 0xad, 0x4e, 0x3c, 0x01, 0xdb, 0x5f,
+	0x6f, 0x0c, 0xa3, 0x08, 0x8b, 0x8a, 0x4e, 0xee, 0xcc, 0xca, 0x45, 0x88, 0xe7, 0x00, 0x7e, 0x98,
+	0x04, 0x3a, 0x25, 0x9d, 0x93, 0xf1, 0xb9, 0x51, 0x11, 0x1f, 0xe1, 0xf8, 0x72, 0xb3, 0x5a, 0xcd,
+	0x53, 0x15, 0x65, 0xca, 0xa7, 0x30, 0x8e, 0xf0, 0x09, 0x38, 0x94, 0xd7, 0x5e, 0x1f, 0x9b, 0xa5,
+	0xab, 0xeb, 0x4b, 0x06, 0x0b, 0x77, 0x16, 0x8a, 0x54, 0xe5, 0x4e, 0x11, 0x0b, 0x17, 0xfa, 0x17,
+	0x81, 0x0a, 0xa3, 0x59, 0xa2, 0xfd, 0xe9, 0x6f, 0x0b, 0x1e, 0xd4, 0x16, 0xcf, 0x28, 0xd5, 0x6a,
+	0xad, 0x53, 0x7c, 0x0d, 0x47, 0x57, 0x9a, 0x3e, 0x29, 0xd2, 0x99, 0x39, 0x6e, 0x7d, 0xa1, 0xaa,
+	0x73, 0xb8, 0xe7, 0xba, 0xa2, 0x85, 0xaf, 0xe0, 0xe0, 0x4a, 0x9b, 0x9e, 0x3d, 0x8c, 0xe1, 0xce,
+	0x29, 0x18, 0x12, 0x2d, 0x7c, 0x0b, 0x87, 0x55, 0x1b, 0xff, 0x1e, 0x75, 0x6f, 0xe3, 0x67, 0xf9,
+	0x4b, 0xef, 0x0b, 0x0b, 0xdf, 0xf0, 0xba, 0x4d, 0x73, 0x76, 0xed, 0x18, 0x9e, 0x99, 0xc2, 0x8e,
+	0x8b, 0xa2, 0x75, 0xd3, 0x65, 0xe0, 0xe5, 0x9f, 0x00, 0x00, 0x00, 0xff, 0xff, 0x28, 0x7b, 0xec,
+	0x5c, 0x07, 0x04, 0x00, 0x00,
+}

proto/compact_formats.proto

@@ -0,0 +1,74 @@
+syntax = "proto3";
+package proto;
+
+// Remember that proto3 fields are all optional.
+
+// A BlockFilter message contains identifiers to select a block: either a
+// height or a hash.
+message BlockFilter {
+     uint64 blockHeight = 1;
+     bytes blockHash = 2;
+}
+
+message RangeFilter {
+    BlockFilter start = 1;
+    BlockFilter end = 2;
+}
+
+// A TxFilter contains the information needed to identify a particular
+// transaction: either a block and an index, or a direct transaction hash.
+message TxFilter {
+     BlockFilter blockID = 1;
+     uint64 txIndex = 2;
+     bytes txHash = 3;
+}
+
+
+// CompactBlock is a packaging of ONLY the data from a block that's needed to:
+//   1. Detect a payment to your shielded Sapling address
+//   2. Detect a spend of your shielded Sapling notes
+//   3. Update your witnesses to generate new Sapling spend proofs.
+message CompactBlock {
+    BlockFilter blockID = 1;
+
+    repeated CompactTx vtx = 3;
+}
+
+message CompactTx {
+    // Index and hash will allow the receiver to call out to chain
+    // explorers or other data structures to retrieve more information
+    // about this transaction.
+    uint64 index = 1;
+    bytes hash = 2;
+
+    repeated CompactSpend spends = 3;
+    repeated CompactOutput outputs = 4;
+}
+
+message CompactSpend {
+    bytes nf = 1;
+}
+
+message CompactOutput {
+    bytes cmu = 1;
+    bytes epk = 2;
+    bytes ciphertext = 3;
+}
+
+// An opaque blob of full transaction data, for fetching anything that is not
+// in the compact format (e.g. the memo field).
+message FullTransaction {
+    TxFilter txID = 1;
+    bytes data = 2;
+}
+
+// Empty placeholder.
+// Someday we may want to specify e.g. a particular chain fork.
+message ChainSpec {}
+
+service CompactTxStreamer {
+    rpc GetLatestBlock(ChainSpec) returns (BlockFilter) {}
+    rpc GetBlock(BlockFilter) returns (CompactBlock) {}
+    rpc GetBlockRange(RangeFilter) returns (stream CompactBlock) {}
+    rpc GetTransaction(TxFilter) returns (FullTransaction) {}
+}

proto/generate.go

@@ -0,0 +1,3 @@
+package proto
+
+//go:generate protoc --go_out=. compact_formats.proto