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FinalityProof

light_client::consensus::leaf

Enum FinalityProof 

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pub enum FinalityProof {
    Assumption,
    HotStuff2 {
        committing_qc: Arc<Certificate>,
        deciding_qc: Arc<Certificate>,
    },
    NewProtocol {
        cert2: Arc<Certificate2<SeqTypes>>,
        leaf_qc: Box<QuorumCertificate2<SeqTypes>>,
    },
    HotStuff {
        precommit_qc: Arc<Certificate>,
        committing_qc: Arc<Certificate>,
        deciding_qc: Arc<Certificate>,
    },
}
Expand description

Data sufficient to convince a client that a certain leaf is finalized.

There are different types of proofs for different scenarios and protocol versions. New proof types can be added while remaining compatible with old serialized proofs.

Variants§

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Assumption

The client has stated that they already trust the finality of this particular leaf.

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HotStuff2

The finality follows from a 2-chain of QCs using the HotStuff2 commit rule.

The requirements for checking finality of a leaf given a 2-chain of QCs are:

  • The leaf has a protocol version indicating it was created via HotStuff2
  • committing_qc.leaf_commit() == leaf.commit()
  • committing_qc.view_number() == leaf.view_number()
  • deciding_qc.view_number() == committing_qc.view_number() + 1
  • Both QCs have a valid threshold signature given a stake table. When the leaf is the last leaf of an epoch, the deciding QC is produced in the subsequent epoch and is checked against the next epoch’s stake table.

Fields

§committing_qc: Arc<Certificate>
§deciding_qc: Arc<Certificate>
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NewProtocol

The finality follows from a Certificate2 in the new protocol.

Certificate2 proves finality. The QC is needed to reconstruct the returned [LeafQueryData] when the proof contains only the leaf committed by cert2.

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HotStuff

The finality follows from a 3-chain of QCs using the original HotStuff commit rule.

The requirements for checking finality of a leaf via the 3-chain rule are similar to the HotStuff2 finality rule, but an extra QC is required with a consecutive view number.

Fields

§precommit_qc: Arc<Certificate>
§committing_qc: Arc<Certificate>
§deciding_qc: Arc<Certificate>

Trait Implementations§

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impl Clone for FinalityProof

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fn clone(&self) -> FinalityProof

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more
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impl Debug for FinalityProof

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

Formats the value using the given formatter. Read more
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impl Default for FinalityProof

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fn default() -> FinalityProof

Returns the “default value” for a type. Read more
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impl<'de> Deserialize<'de> for FinalityProof

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fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl Eq for FinalityProof

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impl PartialEq for FinalityProof

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

Equality operator ==. Read more
1.0.0 (const: unstable) · Source§

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

Inequality operator !=. Read more
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impl Serialize for FinalityProof

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fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>
where __S: Serializer,

Serialize this value into the given Serde serializer. Read more
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impl StructuralPartialEq for FinalityProof

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