/** * An outpoint - a combination of a transaction hash and an index n into its vout * COutPoint主要用在交易的输入CTxIn中，用来确定当前输出的来源， * 包括前一笔的交易hash，以及对应前一笔交易中的第几个输出的序列号。 */ class COutPoint { public: uint256 hash;//交易的哈希 uint32_t n; //交易对应的序列号
/** An input of a transaction. It contains the location of the previous * transaction's output that it claims and a signature that matches the * output's public key. * 交易的输入，包括当前输入对应前一笔交易的输出的位置，以及花费前一笔输出需要的签名脚本 * CScriptWitness是用来支持隔离见证时使用的。 */ class CTxIn { public: COutPoint prevout;//上一笔一笔交易输出位置 CScript scriptSig;//解锁脚本 uint32_t nSequence;//交易序列号 CScriptWitness scriptWitness; //! Only serialized through CTransaction
/* Setting nSequence to this value for every input in a transaction * disables nLockTime. * 规则1：如果一笔交易中所有SEQUENCE_FINAL都被赋值到相应的nSequence参数，nLockTime将会被禁用*/ static const uint32_t SEQUENCE_FINAL = 0xffffffff;
/* Below flags apply in the context of BIP 68*/ /* If this flag set, CTxIn::nSequence is NOT interpreted as a * relative lock-time. * 规则2：如果设置了这个变量，那么规则1（nLockTime被禁用）就失效了 */ static const uint32_t SEQUENCE_LOCKTIME_DISABLE_FLAG = (1 << 31);
/* If CTxIn::nSequence encodes a relative lock-time and this flag * is set, the relative lock-time has units of 512 seconds, * otherwise it specifies blocks with a granularity of 1. * 规则3：如果规则1有效并且设置了此变量，那么相对锁定时间就为512秒，否则锁定时间就为1个区块 */ static const uint32_t SEQUENCE_LOCKTIME_TYPE_FLAG = (1 << 22);
/* If CTxIn::nSequence encodes a relative lock-time, this mask is * applied to extract that lock-time from the sequence field. * 规则4：如果规则1有效，那么这个变量就用来从nSequence计算对应的锁定时间 */ * static const uint32_t SEQUENCE_LOCKTIME_MASK = 0x0000ffff;
/* In order to use the same number of bits to encode roughly the * same wall-clock duration, and because blocks are naturally * limited to occur every 600s on average, the minimum granularity * for time-based relative lock-time is fixed at 512 seconds. * Converting from CTxIn::nSequence to seconds is performed by * multiplying by 512 = 2^9, or equivalently shifting up by * 9 bits. */ static const int SEQUENCE_LOCKTIME_GRANULARITY = 9; static const int SEQUENCE_LOCKTIME_GRANULARITY = 9;
/** An output of a transaction. It contains the public key that the next input * must be able to sign with to claim it. * 交易的输出体，包含交易金额和锁定脚本 */ class CTxOut { public: CAmount nValue;//输出金额 CScript scriptPubKey;//锁定脚本
/** The basic transaction that is broadcasted on the network and contained in * blocks. A transaction can contain multiple inputs and outputs. * 这是网络中广播然后被打进区块的最基本的交易结构，一个交易体可以包含多个交易 */ class CTransaction { public: // Default transaction version. 默认交易版本号 static const int32_t CURRENT_VERSION=2;
// Changing the default transaction version requires a two step process: first // adapting relay policy by bumping MAX_STANDARD_VERSION, and then later date // bumping the default CURRENT_VERSION at which point both CURRENT_VERSION and // MAX_STANDARD_VERSION will be equal. static const int32_t MAX_STANDARD_VERSION=2;
// The local variables are made const to prevent unintended modification // without updating the cached hash value. However, CTransaction is not // actually immutable; deserialization and assignment are implemented, // and bypass the constness. This is safe, as they update the entire // structure, including the hash.
/** This deserializing constructor is provided instead of an Unserialize method. * Unserialize is not possible, since it would require overwriting const fields. */ template <typename Stream> CTransaction(deserialize_type, Stream& s) : CTransaction(CMutableTransaction(deserialize, s)) {}
// Compute a hash that includes both transaction and witness data uint256 GetWitnessHash() const;//计算哈希值 （包含交易和见证数据）
// Return sum of txouts. 返回交易输出金额和总数 CAmount GetValueOut() const; // GetValueIn() is a method on CCoinsViewCache, because // inputs must be known to compute value in.
/** * Get the total transaction size in bytes, including witness data. * "Total Size" defined in BIP141 and BIP144. * @return Total transaction size in bytes */ unsigned int GetTotalSize() const;// 返回交易数据字节性大小
