Blockchain

package
v0.0.0-...-64a9ec9 Latest Latest
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 Go to latest Published: Mar 27, 2024 License: MIT Imports: 18 Imported by: 0

Documentation

Index

Constants

View Source 
const Difficulty = 18
View Source 
const MaxNonce = math.MaxInt64

Variables

This section is empty.

Functions

func DBexists 

func DBexists() bool

func Handle 

func Handle(err error)

func ToHex 

func ToHex(num int64) []byte

Types

type Block 

type Block struct {
	Hash         []byte
	Transactions []*Transaction
	PrevHash     []byte
	Nonce        int
}

func CreateBlock 

func CreateBlock(txs []*Transaction, prevHash []byte) *Block

Method for creating the block(Retuns a block pointer), A block can contain multiple transactions(atleast one)

func Deserialize 

func Deserialize(data []byte) *Block

decodes the byte slice into a block pointer

func Genesis 

func Genesis(coinbase *Transaction) *Block

Creates the genesis block -- the first block in the blockchain

func (*Block) HashTransactions 

func (block *Block) HashTransactions() []byte

func (*Block) Serialize 

func (block *Block) Serialize() []byte

encodes the block into a byte slice

type Blockchain 

type Blockchain struct {
	LastHash []byte     //The hash of the previous block
	Database *badger.DB //pointer to the database.
}

func ContinueBlockchain 

func ContinueBlockchain(address string) *Blockchain

func InitBlockChain 

func InitBlockChain(address string) *Blockchain

func (*Blockchain) AddBlock 

func (chain *Blockchain) AddBlock(transactions []*Transaction) *Block

func (*Blockchain) FindTransaction 

func (chain *Blockchain) FindTransaction(ID []byte) (Transaction, error)

func (*Blockchain) FindUTXO 

func (chain *Blockchain) FindUTXO() map[string]TxOutputs

func (*Blockchain) Iterator 

func (chain *Blockchain) Iterator() *BlockchainIterator

Iterating from the newest to the genesis block(reverse iteration)

func (*Blockchain) SignTransaction 

func (chain *Blockchain) SignTransaction(tx *Transaction, privKey ecdsa.PrivateKey)

func (*Blockchain) VerifyTransaction 

func (chain *Blockchain) VerifyTransaction(tx *Transaction) bool

type BlockchainIterator 

type BlockchainIterator struct {
	CurrentHash []byte //similar to the last hash field
	Database    *badger.DB
}

to iterate over the blockchain

func (*BlockchainIterator) Next 

func (iter *BlockchainIterator) Next() *Block

type MerkleNode 

type MerkleNode struct {
	Left  *MerkleNode
	Right *MerkleNode
	Data  []byte
}

func NewMerkleNode 

func NewMerkleNode(left *MerkleNode, right *MerkleNode, data []byte) *MerkleNode

type MerkleTree 

type MerkleTree struct {
	RootNode *MerkleNode
}

func NewMerkleTree 

func NewMerkleTree(data [][]byte) *MerkleTree

type PrivateKey 

type PrivateKey struct {
	D *big.Int
	X *big.Int
	Y *big.Int
}

func (PrivateKey) ToECDSA 

func (priv PrivateKey) ToECDSA() ecdsa.PrivateKey

type ProofOfWork 

type ProofOfWork struct {
	Block  *Block
	Target *big.Int
}

func NewProof 

func NewProof(block *Block) *ProofOfWork

func (*ProofOfWork) InitData 

func (proof *ProofOfWork) InitData(nonce int) []byte

func (*ProofOfWork) Run 

func (proof *ProofOfWork) Run() (int, []byte)

func (*ProofOfWork) Validate 

func (proof *ProofOfWork) Validate() bool

Computational part of the algorithm is relatively expensive, validation part is pretty simple. Changing a particular block requires the "expensive" part of the algorithm to be run again, hence the blockchain is secure(tamper-proof).

type Transaction 

type Transaction struct {
	ID      []byte
	Inputs  []TxInput
	Outputs []TxOutput
}

Outpoint is the index of the output in the transaction + the transaction id

func CoinbaseTx 

func CoinbaseTx(rec_address string, data string) *Transaction

Coinbase Transaction --> A transaction that creates a new coin, it is the first transaction in a block(rewarding transaction). it has no inputs(no reference to previous outputs and no outpoint) and only one output.

func (*Transaction) HashTransaction 

func (tx *Transaction) HashTransaction() []byte

func (*Transaction) Is_Coinbase 

func (tx *Transaction) Is_Coinbase() bool

func (*Transaction) Serialize 

func (tx *Transaction) Serialize() []byte

func (*Transaction) Sign 

func (tx *Transaction) Sign(private_key ecdsa.PrivateKey, prevTXs map[string]Transaction)

func (*Transaction) To_String 

func (tx *Transaction) To_String() string

func (*Transaction) TrimmedCopy 

func (tx *Transaction) TrimmedCopy() Transaction

func (*Transaction) Verify 

func (tx *Transaction) Verify(prevTxs map[string]Transaction) bool

type TxInput 

type TxInput struct {
	ID        []byte //references to the previous output that led to the input
	OutputIdx int    //index of the referenced output which is spent in the transaction
	Signature []byte //signature or the sender's public key
	PubKey    []byte //unhashed
}

func (*TxInput) UsesKey 

func (inputTx *TxInput) UsesKey(pubKeyHash []byte) bool

type TxOutput 

type TxOutput struct {
	Value      int
	PubKeyHash []byte
}

func NewTxOutput 

func NewTxOutput(value int, address string) *TxOutput

func (*TxOutput) IsLockedWithKey 

func (output *TxOutput) IsLockedWithKey(pubKeyHash []byte) bool

func (*TxOutput) Lock 

func (outputTx *TxOutput) Lock(address []byte)

type TxOutputs 

type TxOutputs struct {
	Outputs []TxOutput
}

func DeserializeOutputs 

func DeserializeOutputs(data []byte) TxOutputs

func (TxOutputs) SerializeOutputs 

func (outputs TxOutputs) SerializeOutputs() []byte

type UTXOSet 

type UTXOSet struct {
	Blockchain *Blockchain
}

func (UTXOSet) CountTransactions 

func (u UTXOSet) CountTransactions() int

func (UTXOSet) DeleteByPrefix 

func (u UTXOSet) DeleteByPrefix(prefix []byte)

func (UTXOSet) FindSpendableOutputs 

func (u UTXOSet) FindSpendableOutputs(pubKeyHash []byte, amount int) (int, map[string][]int)

func (UTXOSet) FindUnspentTransactions 

func (u UTXOSet) FindUnspentTransactions(pubKeyHash []byte) []TxOutput

func (*UTXOSet) NewTransaction 

func (UTXO *UTXOSet) NewTransaction(send_address string, rec_address string, amount int) *Transaction

func (UTXOSet) Reindex 

func (u UTXOSet) Reindex()

func (UTXOSet) Update 

func (u UTXOSet) Update(block *Block)

Source Files

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