Struct BlockHeader

pub struct BlockHeader {
    pub version: Version,
    pub prev_blockhash: BlockHash,
    pub merkle_root: TxMerkleNode,
    pub time: u32,
    pub bits: CompactTarget,
    pub nonce: u32,
}

Bitcoin block header.

Contains all the block’s information except the actual transactions, but including a root of a merkle tree committing to all transactions in the block.

Bitcoin Core References

• CBlockHeader definition

Fields

version: Version

Block version, now repurposed for soft fork signalling.

prev_blockhash: BlockHash

Reference to the previous block in the chain.

merkle_root: TxMerkleNode

The root hash of the merkle tree of transactions in the block.

time: u32

The timestamp of the block, as claimed by the miner.

bits: CompactTarget

The target value below which the blockhash must lie.

nonce: u32

The nonce, selected to obtain a low enough blockhash.

Implementations

impl Header

pub const SIZE: usize = 80usize

The number of bytes that the block header contributes to the size of a block.

pub fn block_hash(&self) -> BlockHash

Returns the block hash.

pub fn target(&self) -> Target

Computes the target (range [0, T] inclusive) that a blockhash must land in to be valid.

pub fn difficulty(&self, params: impl AsRef<Params>) -> u128

Computes the popular “difficulty” measure for mining.

Difficulty represents how difficult the current target makes it to find a block, relative to how difficult it would be at the highest possible target (highest target == lowest difficulty).

pub fn difficulty_float(&self) -> f64

Computes the popular “difficulty” measure for mining and returns a float value of f64.

pub fn validate_pow( &self, required_target: Target, ) -> Result<BlockHash, ValidationError>

Checks that the proof-of-work for the block is valid, returning the block hash.

pub fn work(&self) -> Work

Returns the total work of the block.

Trait Implementations

impl Clone for Header

fn clone(&self) -> Header

Returns a duplicate of the value.

const fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Header

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Decodable for Header

fn consensus_decode_from_finite_reader<R>(r: &mut R) -> Result<Header, Error>

where R: Read + ?Sized,

Decode Self from a size-limited reader.

fn consensus_decode<R>(r: &mut R) -> Result<Header, Error>

where R: Read + ?Sized,

Decode an object with a well-defined format.

impl Encodable for Header

fn consensus_encode<R>(&self, r: &mut R) -> Result<usize, Error>

where R: Write + ?Sized,

Encodes an object with a well-defined format.

impl From<&Header> for BlockHash

fn from(header: &Header) -> BlockHash

Converts to this type from the input type.

impl From<Header> for BlockHash

fn from(header: Header) -> BlockHash

Converts to this type from the input type.

impl Hash for Header

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Header

fn cmp(&self, other: &Header) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Header

fn eq(&self, other: &Header) -> bool

Tests for self and other values to be equal, and is used by ==.

const fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for Header

fn partial_cmp(&self, other: &Header) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for Header

impl Eq for Header

impl StructuralPartialEq for Header