BitCoin 源码（go语言btcd源码）交易过程中各种主体之间的关系

// MsgBlock implements the Message interface and represents a bitcoin
// block message.  It is used to deliver block and transaction information in
// response to a getdata message (MsgGetData) for a given block hash.
type MsgBlock struct {
	Header       BlockHeader
	Transactions []*MsgTx
}

// MsgTx implements the Message interface and represents a bitcoin 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.
type MsgTx struct {
	Version  int32
	TxIn     []*TxIn
	TxOut    []*TxOut
	LockTime uint32
}

// TxIn defines a bitcoin transaction input.
type TxIn struct {
	PreviousOutPoint OutPoint
	SignatureScript  []byte
	Witness          TxWitness
	Sequence         uint32

// TxOut defines a bitcoin transaction output.
type TxOut struct {
	Value    int64
	PkScript []byte
}

// UtxoEntry houses details about an individual transaction output in a utxo
// view such as whether or not it was contained in a coinbase tx, the height of
// the block that contains the tx, whether or not it is spent, its public key
// script, and how much it pays.
type UtxoEntry struct {
	// NOTE: Additions, deletions, or modifications to the order of the
	// definitions in this struct should not be changed without considering
	// how it affects alignment on 64-bit platforms.  The current order is
	// specifically crafted to result in minimal padding.  There will be a
	// lot of these in memory, so a few extra bytes of padding adds up.

	amount      int64
	pkScript    []byte // The public key script for the output.
	blockHeight int32  // Height of block containing tx.

	// packedFlags contains additional info about output such as whether it
	// is a coinbase, whether it is spent, and whether it has been modified
	// since it was loaded.  This approach is used in order to reduce memory
	// usage since there will be a lot of these in memory.
	packedFlags txoFlags
}