Struct zebra_chain::work::difficulty::Work
source · pub struct Work(u128);Expand description
A 128-bit unsigned “Work” value.
Used to calculate the total work for each chain of blocks.
§Consensus
The relative value of Work is consensus-critical, because it is used to
choose the best chain. But its precise value and bit pattern are not
consensus-critical.
We calculate work values according to the Zcash specification, but store them as u128, rather than the implied u256. We don’t expect the total chain work to ever exceed 2^128. The current total chain work for Zcash is 2^58, and Bitcoin adds around 2^91 work per year. (Each extra bit represents twice as much work.)
a node chooses the “best” block chain visible to it by finding the chain of valid blocks with the greatest total work. The work of a block with value nBits for the nBits field in its block header is defined as
floor(2^256 / (ToTarget(nBits) + 1)).
Zcash Specification section 7.7.5.
Tuple Fields§
§0: u128Implementations§
Trait Implementations§
source§impl Add<Work> for PartialCumulativeWork
impl Add<Work> for PartialCumulativeWork
source§impl Add for Work
impl Add for Work
source§type Output = PartialCumulativeWork
type Output = PartialCumulativeWork
The resulting type after applying the
+ operator.source§impl AddAssign<Work> for PartialCumulativeWork
impl AddAssign<Work> for PartialCumulativeWork
source§fn add_assign(&mut self, rhs: Work)
fn add_assign(&mut self, rhs: Work)
Performs the
+= operation. Read moresource§impl Arbitrary for Work
impl Arbitrary for Work
source§type Parameters = ()
type Parameters = ()
The type of parameters that
arbitrary_with accepts for configuration
of the generated Strategy. Parameters must implement Default.source§fn arbitrary_with(_args: ()) -> Self::Strategy
fn arbitrary_with(_args: ()) -> Self::Strategy
source§impl From<Work> for PartialCumulativeWork
impl From<Work> for PartialCumulativeWork
source§impl Ord for Work
impl Ord for Work
source§impl PartialOrd for Work
impl PartialOrd for Work
source§impl Sub<Work> for PartialCumulativeWork
impl Sub<Work> for PartialCumulativeWork
source§impl SubAssign<Work> for PartialCumulativeWork
impl SubAssign<Work> for PartialCumulativeWork
source§fn sub_assign(&mut self, rhs: Work)
fn sub_assign(&mut self, rhs: Work)
Performs the
-= operation. Read moresource§impl TryFrom<ExpandedDifficulty> for Work
impl TryFrom<ExpandedDifficulty> for Work
impl Copy for Work
impl Eq for Work
impl StructuralPartialEq for Work
Auto Trait Implementations§
impl Freeze for Work
impl RefUnwindSafe for Work
impl Send for Work
impl Sync for Work
impl Unpin for Work
impl UnwindSafe for Work
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fn tap_borrow<B>(self, func: impl FnOnce(&B)) -> Self
Immutable access to the
Borrow<B> of a value. Read more§fn tap_borrow_mut<B>(self, func: impl FnOnce(&mut B)) -> Self
fn tap_borrow_mut<B>(self, func: impl FnOnce(&mut B)) -> Self
Mutable access to the
BorrowMut<B> of a value. Read more§fn tap_ref<R>(self, func: impl FnOnce(&R)) -> Self
fn tap_ref<R>(self, func: impl FnOnce(&R)) -> Self
Immutable access to the
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fn tap_ref_mut<R>(self, func: impl FnOnce(&mut R)) -> Self
Mutable access to the
AsMut<R> view of a value. Read more§fn tap_deref<T>(self, func: impl FnOnce(&T)) -> Self
fn tap_deref<T>(self, func: impl FnOnce(&T)) -> Self
Immutable access to the
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fn tap_deref_mut<T>(self, func: impl FnOnce(&mut T)) -> Self
Mutable access to the
Deref::Target of a value. Read more§fn tap_dbg(self, func: impl FnOnce(&Self)) -> Self
fn tap_dbg(self, func: impl FnOnce(&Self)) -> Self
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fn tap_mut_dbg(self, func: impl FnOnce(&mut Self)) -> Self
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builds.§fn tap_borrow_dbg<B>(self, func: impl FnOnce(&B)) -> Self
fn tap_borrow_dbg<B>(self, func: impl FnOnce(&B)) -> Self
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builds.§fn tap_borrow_mut_dbg<B>(self, func: impl FnOnce(&mut B)) -> Self
fn tap_borrow_mut_dbg<B>(self, func: impl FnOnce(&mut B)) -> Self
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builds.§fn tap_ref_dbg<R>(self, func: impl FnOnce(&R)) -> Self
fn tap_ref_dbg<R>(self, func: impl FnOnce(&R)) -> Self
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.tap_ref() only in debug builds, and is erased in release
builds.§fn tap_ref_mut_dbg<R>(self, func: impl FnOnce(&mut R)) -> Self
fn tap_ref_mut_dbg<R>(self, func: impl FnOnce(&mut R)) -> Self
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.tap_ref_mut() only in debug builds, and is erased in release
builds.§fn tap_deref_dbg<T>(self, func: impl FnOnce(&T)) -> Self
fn tap_deref_dbg<T>(self, func: impl FnOnce(&T)) -> Self
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.tap_deref() only in debug builds, and is erased in release
builds.