Enum zebra_chain::block::commitment::Commitment
source · pub enum Commitment {
PreSaplingReserved([u8; 32]),
FinalSaplingRoot(Root),
ChainHistoryActivationReserved,
ChainHistoryRoot(ChainHistoryMmrRootHash),
ChainHistoryBlockTxAuthCommitment(ChainHistoryBlockTxAuthCommitmentHash),
}Expand description
Zcash blocks contain different kinds of commitments to their contents, depending on the network and height.
The Header.commitment_bytes field is interpreted differently, based on the
network and height. The interpretation changes in the network upgrade
activation block, or in the block immediately after network upgrade
activation.
Variants§
PreSaplingReserved([u8; 32])
[Pre-Sapling] “A reserved field, to be ignored.”
This field is not verified.
FinalSaplingRoot(Root)
[Sapling and Blossom] The final Sapling treestate of this block.
The root LEBS2OSP256(rt) of the Sapling note commitment tree corresponding to the final Sapling treestate of this block.
Subsequent Commitment variants also commit to the FinalSaplingRoot,
via their EarliestSaplingRoot and LatestSaplingRoot fields.
Since Zebra checkpoints on Canopy, we don’t need to validate this field, but since it’s included in the ChainHistoryRoot, we are already calculating it, so we might as well validate it.
TODO: this field is verified during semantic verification
ChainHistoryActivationReserved
[Heartwood activation block] Reserved field.
The value of this field MUST be all zeroes.
This MUST NOT be interpreted as a root hash. See ZIP-221 for details.
This field is verified in Commitment::from_bytes.
ChainHistoryRoot(ChainHistoryMmrRootHash)
[(Heartwood activation block + 1) to Canopy] The root of a Merkle Mountain Range chain history tree.
This root hash commits to various features of the chain’s history, including the Sapling commitment tree. This commitment supports the FlyClient protocol. See ZIP-221 for details.
The commitment in each block covers the chain history from the most recent network upgrade, through to the previous block. In particular, an activation block commits to the entire previous network upgrade, and the block after activation commits only to the activation block. (And therefore transitively to all previous network upgrades covered by a chain history hash in their activation block, via the previous block hash field.)
Since Zebra’s mandatory checkpoint includes Canopy activation, we only
need to verify the chain history root from Canopy + 1 block onwards,
using a new history tree based on the Canopy activation block.
NU5 and later upgrades use the Commitment::ChainHistoryBlockTxAuthCommitment
variant.
TODO: this field is verified during contextual verification
ChainHistoryBlockTxAuthCommitment(ChainHistoryBlockTxAuthCommitmentHash)
[NU5 activation onwards] A commitment to:
- the chain history Merkle Mountain Range tree, and
- the auth data merkle tree covering this block.
The chain history Merkle Mountain Range tree commits to the previous block and all ancestors in the current network upgrade. (A new chain history tree starts from each network upgrade’s activation block.)
The auth data merkle tree commits to this block.
This commitment supports the FlyClient protocol and non-malleable transaction IDs. See ZIP-221 and ZIP-244 for details.
See also the Commitment::ChainHistoryRoot variant.
TODO: this field is verified during contextual verification
Implementations§
source§impl Commitment
impl Commitment
sourcepub(super) fn from_bytes(
bytes: [u8; 32],
network: &Network,
height: Height,
) -> Result<Commitment, CommitmentError>
pub(super) fn from_bytes( bytes: [u8; 32], network: &Network, height: Height, ) -> Result<Commitment, CommitmentError>
Returns bytes as the Commitment variant for network and height.
Trait Implementations§
source§impl Arbitrary for Commitment
impl Arbitrary for Commitment
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§type Strategy = BoxedStrategy<Commitment>
type Strategy = BoxedStrategy<Commitment>
The type of
Strategy used to generate values of type Self.source§impl Clone for Commitment
impl Clone for Commitment
source§fn clone(&self) -> Commitment
fn clone(&self) -> Commitment
Returns a copy of the value. Read more
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from
source. Read moresource§impl Debug for Commitment
impl Debug for Commitment
source§impl<'de> Deserialize<'de> for Commitment
impl<'de> Deserialize<'de> for Commitment
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 PartialEq for Commitment
impl PartialEq for Commitment
source§impl Serialize for Commitment
impl Serialize for Commitment
impl Copy for Commitment
impl Eq for Commitment
impl StructuralPartialEq for Commitment
Auto Trait Implementations§
impl Freeze for Commitment
impl RefUnwindSafe for Commitment
impl Send for Commitment
impl Sync for Commitment
impl Unpin for Commitment
impl UnwindSafe for Commitment
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