Struct Checkpoint 

pub struct Checkpoint {
    pub offset: Offset,
    pub chain_hash: Hash,
    pub record_count: u64,
    pub created_at: Timestamp,
}

A periodic verification checkpoint stored in the log.

Checkpoints are records IN the log (not separate files), which means:

• They are part of the hash chain (tamper-evident)
• Checkpoint history is immutable
• Single source of truth

Checkpoints enable efficient verified reads by providing trusted anchor points, reducing verification from O(n) to O(k) where k is the distance to the nearest checkpoint.

Fields

offset: Offset

Log position of this checkpoint record.

chain_hash: Hash

Cumulative hash of the chain at this point.

record_count: u64

Total number of records from genesis to this checkpoint.

created_at: Timestamp

When this checkpoint was created.

Implementations

impl Checkpoint

pub fn new( offset: Offset, chain_hash: Hash, record_count: u64, created_at: Timestamp, ) -> Self

Creates a new checkpoint.

Preconditions

• record_count should equal offset.as_u64() + 1 (0-indexed offset)

Trait Implementations

impl Clone for Checkpoint

fn clone(&self) -> Checkpoint

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Checkpoint

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Checkpoint

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Hash for Checkpoint

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

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 PartialEq for Checkpoint

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

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

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 Serialize for Checkpoint

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for Checkpoint

impl Eq for Checkpoint

impl StructuralPartialEq for Checkpoint