Struct zebra_chain::sapling::spend::Spend
source · pub struct Spend<AnchorV: AnchorVariant> {
pub cv: NotSmallOrderValueCommitment,
pub per_spend_anchor: AnchorV::PerSpend,
pub nullifier: Nullifier,
pub rk: ValidatingKey,
pub zkproof: Groth16Proof,
pub spend_auth_sig: Signature<SpendAuth>,
}Expand description
A Spend Description, as described in protocol specification §7.3.
§Differences between Transaction Versions
In Transaction::V4, each Spend has its own anchor. In Transaction::V5,
there is a single shared_anchor for the entire transaction. This
structural difference is modeled using the AnchorVariant type trait.
V4 transactions serialize the fields of spends and outputs together.
V5 transactions split them into multiple arrays.
Fields§
§cv: NotSmallOrderValueCommitmentA value commitment to the value of the input note.
per_spend_anchor: AnchorV::PerSpendAn anchor for this spend.
The anchor is the root of the Sapling note commitment tree in a previous block. This root should be in the best chain for a transaction to be mined, and it must be in the relevant chain for a transaction to be valid.
Some transaction versions have a shared anchor, rather than a per-spend anchor.
nullifier: NullifierThe nullifier of the input note.
rk: ValidatingKeyThe randomized public key for spend_auth_sig.
zkproof: Groth16ProofThe ZK spend proof.
spend_auth_sig: Signature<SpendAuth>A signature authorizing this spend.
Implementations§
sourcepub fn from_v5_parts(
prefix: SpendPrefixInTransactionV5,
zkproof: Groth16Proof,
spend_auth_sig: Signature<SpendAuth>,
) -> Spend<SharedAnchor>
pub fn from_v5_parts( prefix: SpendPrefixInTransactionV5, zkproof: Groth16Proof, spend_auth_sig: Signature<SpendAuth>, ) -> Spend<SharedAnchor>
Combine the prefix and non-prefix fields from V5 transaction deserialization.
sourcepub fn into_v5_parts(
self,
) -> (SpendPrefixInTransactionV5, Groth16Proof, Signature<SpendAuth>)
pub fn into_v5_parts( self, ) -> (SpendPrefixInTransactionV5, Groth16Proof, Signature<SpendAuth>)
Split out the prefix and non-prefix fields for V5 transaction serialization.
Trait Implementations§
source§impl Arbitrary for Spend<PerSpendAnchor>
impl Arbitrary for Spend<PerSpendAnchor>
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::Parameters) -> Self::Strategy
fn arbitrary_with(_args: Self::Parameters) -> Self::Strategy
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::Parameters) -> Self::Strategy
fn arbitrary_with(_args: Self::Parameters) -> Self::Strategy
source§impl<'de, AnchorV: AnchorVariant> Deserialize<'de> for Spend<AnchorV>where
AnchorV::PerSpend: Deserialize<'de>,
impl<'de, AnchorV: AnchorVariant> Deserialize<'de> for Spend<AnchorV>where
AnchorV::PerSpend: Deserialize<'de>,
source§fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>where
__D: Deserializer<'de>,
fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>where
__D: Deserializer<'de>,
Deserialize this value from the given Serde deserializer. Read more
source§impl From<(Spend<PerSpendAnchor>, FieldNotPresent)> for Spend<PerSpendAnchor>
impl From<(Spend<PerSpendAnchor>, FieldNotPresent)> for Spend<PerSpendAnchor>
source§fn from(per_spend: (Spend<PerSpendAnchor>, FieldNotPresent)) -> Self
fn from(per_spend: (Spend<PerSpendAnchor>, FieldNotPresent)) -> Self
Take the Spend<PerSpendAnchor> from a spend + anchor tuple.
source§impl<AnchorV: AnchorVariant> Serialize for Spend<AnchorV>
impl<AnchorV: AnchorVariant> Serialize for Spend<AnchorV>
source§impl TrustedPreallocate for Spend<PerSpendAnchor>
impl TrustedPreallocate for Spend<PerSpendAnchor>
The maximum number of sapling spends in a valid Zcash on-chain transaction V4.
source§fn max_allocation() -> u64
fn max_allocation() -> u64
Provides a loose upper bound on the size of the
Vec<T: TrustedPreallocate>
which can possibly be received from an honest peer.source§impl ZcashDeserialize for Spend<PerSpendAnchor>
impl ZcashDeserialize for Spend<PerSpendAnchor>
source§fn zcash_deserialize<R: Read>(reader: R) -> Result<Self, SerializationError>
fn zcash_deserialize<R: Read>(reader: R) -> Result<Self, SerializationError>
§Consensus
The anchor of each Spend description MUST refer to some earlier block’s final Sapling treestate. The anchor is encoded separately in each Spend description for v4 transactions, or encoded once and shared between all Spend descriptions in a v5 transaction.
https://zips.z.cash/protocol/protocol.pdf#spendsandoutputs
This rule is also implemented in
zebra_state::service::check::anchors and
crate::transaction::serialize.
The “anchor encoding for v4 transactions” is implemented here.
source§impl ZcashSerialize for Spend<PerSpendAnchor>
impl ZcashSerialize for Spend<PerSpendAnchor>
source§fn zcash_serialize_to_vec(&self) -> Result<Vec<u8>, Error>
fn zcash_serialize_to_vec(&self) -> Result<Vec<u8>, Error>
Helper function to construct a vec to serialize the current struct into
source§fn zcash_serialized_size(&self) -> usize
fn zcash_serialized_size(&self) -> usize
Get the size of
self by using a fake writer.impl<AnchorV: AnchorVariant + PartialEq> Eq for Spend<AnchorV>
impl<AnchorV: AnchorVariant> StructuralPartialEq for Spend<AnchorV>
Auto Trait Implementations§
impl<AnchorV> Freeze for Spend<AnchorV>
impl<AnchorV> RefUnwindSafe for Spend<AnchorV>
impl<AnchorV> Send for Spend<AnchorV>
impl<AnchorV> Sync for Spend<AnchorV>
impl<AnchorV> Unpin for Spend<AnchorV>
impl<AnchorV> UnwindSafe for Spend<AnchorV>
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