wire

package
v0.0.9 Latest Latest
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 Go to latest Published: Aug 6, 2021 License: MIT Imports: 23 Imported by: 0

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Index

Constants

View Source 
const (
	BlockVersionV1 = 1
	BlockVersionV2 = 2

	BlockVersion = BlockVersionV2
)

BlockVersion is the current latest supported block version.

View Source 
const (
	// TxVersion is the current latest supported transaction version.
	TxVersion = 1

	// MaxTxInSequenceNum is the maximum sequence number the sequence field
	// of a transaction input can be.
	MaxTxInSequenceNum uint64 = math.MaxUint64

	// MaxPrevOutIndex is the maximum index the index field of a previous
	// outpoint can be.
	MaxPrevOutIndex uint32 = math.MaxUint32

	// SequenceLockTimeDisabled is a flag that if set on a transaction
	// input's sequence number, the sequence number will not be interpreted
	// as a relative locktime.
	SequenceLockTimeDisabled uint64 = 1 << 63

	// SequenceLockTimeIsSeconds is a flag thabt if set on a transaction
	// input's sequence number, the relative locktime has units of 32
	// seconds(close to block interval).
	SequenceLockTimeIsSeconds uint64 = 1 << 38

	// SequenceLockTimeMask is a mask that extracts the relative locktime
	// when masked against the transaction input sequence number.
	SequenceLockTimeMask uint64 = 0x00000000ffffffff

	// SequenceLockTimeGranularity is the defined time based granularity
	// for seconds-based relative time locks. When converting from seconds
	// to a sequence number, the value is right shifted by this amount,
	// therefore the granularity of relative time locks in 32 or 2^5
	// seconds. Enforced relative lock times are multiples of 32 seconds.
	SequenceLockTimeGranularity = 5
)
View Source 
const (
	ProposalVersion          = 1
	HeadersPerProposal       = 2
	HeaderSizePerPlaceHolder = 500
	PlaceHolderSize          = HeadersPerProposal * HeaderSizePerPlaceHolder
)
View Source 
const HashSize = 32

HashSize is the array size used to store sha hashes. See Hash.

View Source 
const MaxBlockPayload = 2000000

MaxBlockPayload is the maximum bytes a block message can be in bytes. 2MB.

View Source 
const MaxHashStringSize = HashSize * 2

MaxHashStringSize is the maximum length of a Hash hash string.

View Source 
const MaxTxPerBlock = (MaxBlockPayload / minTxPayload) + 1

maxTxPerBlock is the maximum number of transactions that could possibly fit into a block.

View Source 
const MinBlockHeaderPayload = blockHeaderMinPlainSize

Variables

View Source 
var ErrHashStrSize = fmt.Errorf("max hash string length is %v bytes", MaxHashStringSize)

ErrHashStrSize describes an error that indicates the caller specified a hash string that has too many characters.

View Source 
var (
	ErrInvalidCodecMode = errors.New("invalid codec mode for wire")
)

Functions

func Decode 

func Decode(dst *Hash, src string) error

Decode decodes the byte-reversed hexadecimal string encoding of a Hash to a destination.

func DoubleHashB 

func DoubleHashB(b []byte) []byte

DoubleHashB calculates sha256(sha256(b)) and returns the resulting bytes.

func Hash2CommonHash 

func Hash2CommonHash(h Hash) common.Hash

func HashB 

func HashB(b []byte) []byte

HashB calculates hash(b) and returns the resulting bytes.

func IsValidFrozenPeriod 

func IsValidFrozenPeriod(height uint64) bool

func IsValidStakingValue 

func IsValidStakingValue(value int64) bool

func MoveBytes 

func MoveBytes(bs []byte) []byte

func NewEmptyBLSPublicKey 

func NewEmptyBLSPublicKey() *chiapos.G1Element

func NewEmptyBLSSignature 

func NewEmptyBLSSignature() *chiapos.G2Element

func NewEmptyBigInt 

func NewEmptyBigInt() *big.Int

func NewEmptyPoCPublicKey 

func NewEmptyPoCPublicKey() *pocec.PublicKey

func NewEmptyPoCSignature 

func NewEmptyPoCSignature() *pocec.Signature

func ReadUint64 

func ReadUint64(r io.Reader, pver uint32) (uint64, int, error)

ReadUint64 reads a variable from r for 8 Bytes and returns it as a uint64.

func WriteTxOut 

func WriteTxOut(w io.Writer, to *TxOut) error

WriteTxOut encodes to into the mass protocol encoding for a transaction output (TxOut) to w.

func WriteUint64 

func WriteUint64(w io.Writer, val uint64) (int, error)

WriteUint64 serializes val to 8 Bytes

func WriteVarBytes 

func WriteVarBytes(w io.Writer, bytes []byte) error

Types

type BlockBase 

type BlockBase struct {
	Header    BlockHeader
	Proposals ProposalArea
}

func NewBlockBaseFromProto 

func NewBlockBaseFromProto(pb *wirepb.BlockBase) (*BlockBase, error)

func (*BlockBase) FromProto 

func (base *BlockBase) FromProto(pb *wirepb.BlockBase) error

func (*BlockBase) ToProto 

func (base *BlockBase) ToProto() (*wirepb.BlockBase, error)

type BlockHeader 

type BlockHeader struct {
	ChainID         Hash
	Version         uint64
	Height          uint64
	Timestamp       time.Time
	Previous        Hash
	TransactionRoot Hash
	WitnessRoot     Hash
	ProposalRoot    Hash
	Target          *big.Int
	Challenge       Hash
	PubKey          interfaces.PublicKey
	Proof           poc.Proof
	Signature       interfaces.Signature
	BanList         []interfaces.PublicKey
	BindingRoot     common.Hash // use this while header.Version >= 2
}

func MockHeader 

func MockHeader(version uint64, proofType poc.ProofType) *BlockHeader

func NewBlockHeaderFromBytes 

func NewBlockHeaderFromBytes(bhBytes []byte, mode CodecMode) (*BlockHeader, error)

func NewBlockHeaderFromProto 

func NewBlockHeaderFromProto(pb *wirepb.BlockHeader) (*BlockHeader, error)

NewBlockHeaderFromProto get wire BlockHeader from proto BlockHeader

func NewEmptyBlockHeader 

func NewEmptyBlockHeader() *BlockHeader

func (*BlockHeader) BannedPublicKeys 

func (h *BlockHeader) BannedPublicKeys() (banned []interfaces.PublicKey)

Both old and new public keys are allowed packed

func (*BlockHeader) BlockHash 

func (h *BlockHeader) BlockHash() Hash

BlockHash computes the block identifier hash for the given block header.

func (*BlockHeader) Bytes 

func (h *BlockHeader) Bytes(mode CodecMode) ([]byte, error)

func (*BlockHeader) CheckVersionConstraint 

func (h *BlockHeader) CheckVersionConstraint() error

func (*BlockHeader) Decode 

func (h *BlockHeader) Decode(r io.Reader, mode CodecMode) (n int, err error)

Decode decodes r using the given protocol encoding into the receiver.

func (*BlockHeader) Encode 

func (h *BlockHeader) Encode(w io.Writer, mode CodecMode) (n int, err error)

Encode encodes the receiver to w using the given protocol encoding.

func (*BlockHeader) FromProto 

func (h *BlockHeader) FromProto(pb *wirepb.BlockHeader) error

FromProto load proto BlockHeader into wire BlockHeader

func (*BlockHeader) GetChainID 

func (h *BlockHeader) GetChainID() (Hash, error)

GetChainID calc chainID, only block with 0 height can be calc

func (*BlockHeader) PlainSize 

func (h *BlockHeader) PlainSize() int

func (*BlockHeader) PoCHash 

func (h *BlockHeader) PoCHash() (Hash, error)

PoCHash generate hash of all PoC needed elements in block header

func (*BlockHeader) PublicKey 

func (h *BlockHeader) PublicKey() interfaces.PublicKey

func (*BlockHeader) Quality 

func (h *BlockHeader) Quality() *big.Int

Quality

func (*BlockHeader) SetBanListFromProposals 

func (h *BlockHeader) SetBanListFromProposals(proposals []*FaultPubKey) error

func (*BlockHeader) SetBytes 

func (h *BlockHeader) SetBytes(bs []byte, mode CodecMode) error

func (*BlockHeader) ToProto 

func (h *BlockHeader) ToProto() *wirepb.BlockHeader

ToProto get proto BlockHeader from wire BlockHeader

func (*BlockHeader) VerifySig 

func (h *BlockHeader) VerifySig() (bool, error)

type CodecMode 

type CodecMode uint64

Mode to encode/decode data 

const (
	DB CodecMode = iota
	Packet
	Plain
	ID
	WitnessID
	PoCID
	ChainID
)

type FaultPubKey 

type FaultPubKey struct {
	PubKey    interfaces.PublicKey
	Testimony [HeadersPerProposal]*BlockHeader
	// contains filtered or unexported fields
}

FaultPubKey implements Proposal, representing for punishment-double-mining-pubKey

func NewEmptyFaultPubKey 

func NewEmptyFaultPubKey() *FaultPubKey

func NewFaultPubKeyFromBytes 

func NewFaultPubKeyFromBytes(bs []byte, mode CodecMode) (*FaultPubKey, error)

func (*FaultPubKey) Bytes 

func (fpk *FaultPubKey) Bytes(mode CodecMode) ([]byte, error)

func (*FaultPubKey) Decode 

func (fpk *FaultPubKey) Decode(r io.Reader, mode CodecMode) (n int, err error)

func (*FaultPubKey) Encode 

func (fpk *FaultPubKey) Encode(w io.Writer, mode CodecMode) (n int, err error)

func (*FaultPubKey) FromProto 

func (fpk *FaultPubKey) FromProto(pb *wirepb.Punishment) error

func (*FaultPubKey) Hash 

func (fpk *FaultPubKey) Hash(index int) Hash

func (*FaultPubKey) IsValid 

func (fpk *FaultPubKey) IsValid() error

func (*FaultPubKey) PlainSize 

func (fpk *FaultPubKey) PlainSize() int

PlainSize returns the number of bytes the FaultPubKey contains.

func (*FaultPubKey) SetBytes 

func (fpk *FaultPubKey) SetBytes(bs []byte, mode CodecMode) error

func (*FaultPubKey) ToProto 

func (fpk *FaultPubKey) ToProto() *wirepb.Punishment

func (*FaultPubKey) Type 

func (fpk *FaultPubKey) Type() ProposalType

func (*FaultPubKey) Version 

func (fpk *FaultPubKey) Version() uint32

type Hash 

type Hash [HashSize]byte

Hash is used in several of the mass messages and common structures. It typically represents the double sha256 of data.

func BuildMerkleTreeStoreForProposal 

func BuildMerkleTreeStoreForProposal(proposals *ProposalArea) []*Hash

func BuildMerkleTreeStoreTransactions 

func BuildMerkleTreeStoreTransactions(transactions []*MsgTx, witness bool) []*Hash

func CommonHash2Hash 

func CommonHash2Hash(h *common.Hash) *Hash

func DoubleHashH 

func DoubleHashH(b []byte) Hash

DoubleHashH calculates sha256(sha256(b)) and returns the resulting bytes as a Hash.

func GetMerkleRootFromCache 

func GetMerkleRootFromCache(baseHash *Hash, cache []*Hash) Hash

func GetProposalHash 

func GetProposalHash(proposal Proposal, index int) Hash

func HashH 

func HashH(b []byte) Hash

HashH calculates hash(b) and returns the resulting bytes as a Hash.

func HashMerkleBranches 

func HashMerkleBranches(left *Hash, right *Hash) *Hash

HashMerkleBranches takes two hashes, treated as the left and right tree nodes, and returns the hash of their concatenation. This is a helper function used to aid in the generation of a merkle tree.

func NewHash 

func NewHash(newHash []byte) (*Hash, error)

NewHash returns a new Hash from a byte slice. An error is returned if the number of bytes passed in is not HashSize.

func NewHashFromHash 

func NewHashFromHash(h Hash) *Hash

func NewHashFromProto 

func NewHashFromProto(pb *wirepb.Hash) (*Hash, error)

NewHashFromProto get Hash From proto Hash

func NewHashFromStr 

func NewHashFromStr(hash string) (*Hash, error)

NewHashFromStr creates a Hash from a hash string. The string should be the hexadecimal string of a byte-reversed hash, but any missing characters result in zero padding at the end of the Hash.

func (*Hash) Bytes 

func (hash *Hash) Bytes() []byte

Bytes returns the bytes which represent the hash as a byte slice.

NOTE: This makes a copy of the bytes and should have probably been named CloneBytes. It is generally cheaper to just slice the hash directly thereby reusing the same bytes rather than calling this method.

func (*Hash) FromProto 

func (hash *Hash) FromProto(pb *wirepb.Hash) error

FromProto load proto Hash into wire Hash

func (*Hash) IsEqual 

func (hash *Hash) IsEqual(target *Hash) bool

IsEqual returns true if target is the same as hash.

func (Hash) Ptr 

func (hash Hash) Ptr() *Hash

func (*Hash) SetBytes 

func (hash *Hash) SetBytes(newHash []byte) error

SetBytes sets the bytes which represent the hash. An error is returned if the number of bytes passed in is not HashSize.

func (Hash) String 

func (hash Hash) String() string

String returns the Hash as the hexadecimal string of the byte-reversed hash.

func (*Hash) ToProto 

func (hash *Hash) ToProto() *wirepb.Hash

ToProto get proto Hash from Hash

type Message 

type Message interface {
	Encode(io.Writer, CodecMode) (int, error)
	Decode(io.Reader, CodecMode) (int, error)
	Bytes(CodecMode) ([]byte, error)
	SetBytes([]byte, CodecMode) error
	PlainSize() int
}

type MsgBlock 

type MsgBlock struct {
	Header       BlockHeader
	Proposals    ProposalArea
	Transactions []*MsgTx
}

MsgBlock implements the Message interface and represents a mass block message. It is used to deliver block and transaction information in response to a getdata message (MsgGetData) for a given block hash.

func NewBlockFromProto 

func NewBlockFromProto(pb *wirepb.Block) (*MsgBlock, error)

NewBlockFromProto get wire Block from proto Block

func NewEmptyMsgBlock 

func NewEmptyMsgBlock() *MsgBlock

func NewMsgBlock 

func NewMsgBlock(blockHeader *BlockHeader) *MsgBlock

NewMsgBlock returns a new mass block message that conforms to the Message interface. See MsgBlock for details.

func (*MsgBlock) AddTransaction 

func (msg *MsgBlock) AddTransaction(tx *MsgTx)

AddTransaction adds a transaction to the message.

func (*MsgBlock) BlockHash 

func (msg *MsgBlock) BlockHash() Hash

BlockHash computes the block identifier hash for this block.

func (*MsgBlock) Bytes 

func (msg *MsgBlock) Bytes(mode CodecMode) ([]byte, error)

func (*MsgBlock) ClearTransactions 

func (msg *MsgBlock) ClearTransactions()

ClearTransactions removes all transactions from the message.

func (*MsgBlock) Decode 

func (msg *MsgBlock) Decode(r io.Reader, mode CodecMode) (n int, err error)

Decode decodes r using the given protocol encoding into the receiver.

func (*MsgBlock) DeserializeTxLoc 

func (msg *MsgBlock) DeserializeTxLoc(r *bytes.Buffer) ([]TxLoc, error)

func (*MsgBlock) Encode 

func (msg *MsgBlock) Encode(w io.Writer, mode CodecMode) (n int, err error)

Encode encodes the receiver to w using the given protocol encoding.

func (*MsgBlock) FromProto 

func (msg *MsgBlock) FromProto(pb *wirepb.Block) error

FromProto load proto Block into wire Block, if error happens, old content is still immutable

func (*MsgBlock) PlainSize 

func (msg *MsgBlock) PlainSize() int

PlainSize returns the number of plain bytes the block contains.

func (*MsgBlock) SetBytes 

func (msg *MsgBlock) SetBytes(bs []byte, mode CodecMode) error

func (*MsgBlock) ToProto 

func (msg *MsgBlock) ToProto() (*wirepb.Block, error)

ToProto get proto Block from wire Block

func (*MsgBlock) TxHashes 

func (msg *MsgBlock) TxHashes() ([]Hash, error)

TxHashes returns a slice of hashes of all of transactions in this block.

type MsgTx 

type MsgTx struct {
	Version  uint32
	TxIn     []*TxIn
	TxOut    []*TxOut
	LockTime uint64
	Payload  []byte
}

MsgTx implements the Message interface and represents a mass tx message. It is used to deliver transaction information in response to a getdata message (MsgGetData) for a given transaction.

Use the AddTxIn and AddTxOut functions to build up the list of transaction inputs and outputs.

func NewMsgTx 

func NewMsgTx() *MsgTx

NewMsgTx returns a new mass tx message that conforms to the Message interface. The return instance has a default version of TxVersion and there are no transaction inputs or outputs. Also, the lock time is set to zero to indicate the transaction is valid immediately as opposed to some time in future.

func NewTxFromProto 

func NewTxFromProto(pb *wirepb.Tx) (*MsgTx, error)

NewTxFromProto get wire Tx from proto Tx

func (*MsgTx) AddTxIn 

func (msg *MsgTx) AddTxIn(ti *TxIn)

AddTxIn adds a transaction input to the message.

func (*MsgTx) AddTxOut 

func (msg *MsgTx) AddTxOut(to *TxOut)

AddTxOut adds a transaction output to the message.

func (*MsgTx) Bytes 

func (msg *MsgTx) Bytes(mode CodecMode) ([]byte, error)

func (*MsgTx) Decode 

func (msg *MsgTx) Decode(r io.Reader, mode CodecMode) (n int, err error)

func (*MsgTx) Encode 

func (msg *MsgTx) Encode(w io.Writer, mode CodecMode) (n int, err error)

func (*MsgTx) FromProto 

func (msg *MsgTx) FromProto(pb *wirepb.Tx) error

FromProto load proto TX into wire Tx

func (*MsgTx) IsCoinBaseTx 

func (msg *MsgTx) IsCoinBaseTx() bool

IsCoinBaseTx determines whether or not a transaction is a coinbase. A coinbase is a special transaction created by miners that has no inputs. This is represented in the block chain by a transaction with a single input that has a previous output transaction index set to the maximum value along with a zero hash.

This function only differs from IsCoinBase in that it works with a raw wire transaction as opposed to a higher level util transaction.

func (*MsgTx) PlainSize 

func (msg *MsgTx) PlainSize() int

PlainSize returns the number of bytes the transaction contains.

func (*MsgTx) RemoveAllTxOut 

func (msg *MsgTx) RemoveAllTxOut()

func (*MsgTx) RemoveTxOut 

func (msg *MsgTx) RemoveTxOut(index int)

func (*MsgTx) SetBytes 

func (msg *MsgTx) SetBytes(bs []byte, mode CodecMode) error

func (*MsgTx) SetPayload 

func (msg *MsgTx) SetPayload(payload []byte)

func (*MsgTx) ToProto 

func (msg *MsgTx) ToProto() *wirepb.Tx

ToProto get proto Tx from wire Tx

func (*MsgTx) TxHash 

func (msg *MsgTx) TxHash() Hash

TxHash generates the Hash for the transaction.

func (*MsgTx) WitnessHash 

func (msg *MsgTx) WitnessHash() Hash

WitnessHash generates the hash of the transaction serialized according to the new witness serialization defined in BIP0141 and BIP0144. The final output is used within the Segregated Witness commitment of all the witnesses within a block. If a transaction has no witness data, then the witness hash, is the same as its txid.

type NormalProposal 

type NormalProposal struct {
	// contains filtered or unexported fields
}

NormalProposal implements Proposal, representing for all proposals with no consensus proposalType.

func NewPlaceHolder 

func NewPlaceHolder() *NormalProposal

PlaceHolder prevents miner from eliminating all punishment proposals, because that is more profitable to save block size for transactions.

func (*NormalProposal) Bytes 

func (np *NormalProposal) Bytes(mode CodecMode) ([]byte, error)

func (*NormalProposal) Content 

func (np *NormalProposal) Content() []byte

func (*NormalProposal) Decode 

func (np *NormalProposal) Decode(r io.Reader, mode CodecMode) (n int, err error)

func (*NormalProposal) Encode 

func (np *NormalProposal) Encode(w io.Writer, mode CodecMode) (n int, err error)

func (*NormalProposal) FromProto 

func (np *NormalProposal) FromProto(pb *wirepb.Proposal) error

func (*NormalProposal) Hash 

func (np *NormalProposal) Hash(index int) Hash

func (*NormalProposal) PlainSize 

func (np *NormalProposal) PlainSize() int

func (*NormalProposal) SetBytes 

func (np *NormalProposal) SetBytes(bs []byte, mode CodecMode) error

func (*NormalProposal) ToProto 

func (np *NormalProposal) ToProto() *wirepb.Proposal

func (*NormalProposal) Type 

func (np *NormalProposal) Type() ProposalType

func (*NormalProposal) Version 

func (np *NormalProposal) Version() uint32

type OutPoint 

type OutPoint struct {
	Hash  Hash
	Index uint32
}

OutPoint defines a mass data type that is used to track previous transaction outputs.

func NewOutPoint 

func NewOutPoint(hash *Hash, index uint32) *OutPoint

NewOutPoint returns a new mass transaction outpoint point with the provided hash and index.

func (OutPoint) String 

func (o OutPoint) String() string

String returns the OutPoint in the human-readable form "hash:index".

type Proposal 

type Proposal interface {
	Bytes(CodecMode) ([]byte, error)
	SetBytes([]byte, CodecMode) error
	Hash(int) Hash
}

General Proposal Interface

type ProposalArea 

type ProposalArea struct {
	PunishmentArea []*FaultPubKey
	OtherArea      []*NormalProposal
}

ProposalArea represents for proposals in blocks.

func NewProposalArea 

func NewProposalArea(punishmentArea []*FaultPubKey, otherArea []*NormalProposal) (*ProposalArea, error)

func NewProposalAreaFromProto 

func NewProposalAreaFromProto(pb *wirepb.ProposalArea) (*ProposalArea, error)

NewProposalAreaFromProto get wire ProposalArea from proto ProposalArea

func (*ProposalArea) Bytes 

func (pa *ProposalArea) Bytes(mode CodecMode) ([]byte, error)

func (*ProposalArea) Count 

func (pa *ProposalArea) Count() int

func (*ProposalArea) Decode 

func (pa *ProposalArea) Decode(r io.Reader, mode CodecMode) (n int, err error)

func (*ProposalArea) Encode 

func (pa *ProposalArea) Encode(w io.Writer, mode CodecMode) (n int, err error)

func (*ProposalArea) FromProto 

func (pa *ProposalArea) FromProto(pb *wirepb.ProposalArea) error

FromProto load proto ProposalArea into wire ProposalArea, if error happens, old content is still immutable

func (*ProposalArea) OtherCount 

func (pa *ProposalArea) OtherCount() int

func (*ProposalArea) PlainSize 

func (pa *ProposalArea) PlainSize() int

func (*ProposalArea) PunishmentCount 

func (pa *ProposalArea) PunishmentCount() int

func (*ProposalArea) SetBytes 

func (pa *ProposalArea) SetBytes(bs []byte, mode CodecMode) error

func (*ProposalArea) ToProto 

func (pa *ProposalArea) ToProto() (*wirepb.ProposalArea, error)

ToProto get proto ProposalArea from wire ProposalArea

type ProposalType 

type ProposalType uint32

type TxIn 

type TxIn struct {
	PreviousOutPoint OutPoint
	Witness          TxWitness
	Sequence         uint64
}

TxIn defines a mass transaction input.

func NewTxIn 

func NewTxIn(prevOut *OutPoint, witness [][]byte) *TxIn

NewTxIn returns a new mass transaction input with the provided previous outpoint point and signature script with a default sequence of MaxTxInSequenceNum.

func (*TxIn) PlainSize 

func (t *TxIn) PlainSize() int

PlainSize returns the number of bytes it would take to serialize the the transaction input.

type TxLoc 

type TxLoc struct {
	TxStart int
	TxLen   int
}

TxLoc holds locator data for the offset and length of where a transaction is located within a MsgBlock data buffer.

type TxOut 

type TxOut struct {
	Value    int64
	PkScript []byte
}

TxOut defines a mass transaction output.

func NewTxOut 

func NewTxOut(value int64, pkScript []byte) *TxOut

NewTxOut returns a new mass transaction output with the provided transaction value and public key script.

func (*TxOut) PlainSize 

func (t *TxOut) PlainSize() int

PlainSize returns the number of bytes it would take to serialize the the transaction output.

type TxWitness 

type TxWitness [][]byte

TxWitness defines the witness for a TxIn. A witness is to be interpreted as a slice of byte slices, or a stack with one or many elements.

func (TxWitness) PlainSize 

func (t TxWitness) PlainSize() int

PlainSize returns the number of bytes it would take to serialize the the transaction input's witness.

type WitnessRedeemScriptHash 

type WitnessRedeemScriptHash [sha256.Size]byte

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