Struct Fingerprint 

pub struct Fingerprint(pub [u8; 16]);

A stable transaction fingerprint for import deduplication.

Computed from date + amount + normalized description text using BLAKE3. Stored as 128 bits (16 bytes) — sufficient for collision resistance in typical ledger sizes (millions of transactions).

Unlike structural_hash, this fingerprint is designed to match transactions that refer to the same real-world event even if they have slightly different representations (e.g., imported vs manually entered).

Tuple Fields

0: [u8; 16]

Implementations

impl Fingerprint

pub fn compute(date: &str, amount: Option<&str>, text: &str) -> Self

Compute a fingerprint from transaction components.

The text is normalized (lowercased, whitespace-collapsed) before hashing to handle minor formatting differences between import sources.

pub fn from_transaction(date: &str, txn: &TransactionData) -> Self

Compute a fingerprint from a TransactionData and date.

Uses the first posting’s amount and the payee+narration as text.

pub fn to_hex(&self) -> String

Encode as a hex string for storage in metadata.

pub fn from_hex(s: &str) -> Result<Self, FingerprintError>

Decode from a hex string.

Errors

Returns Err if the string is not exactly 32 hex characters.

Trait Implementations

impl Clone for Fingerprint

fn clone(&self) -> Fingerprint

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Fingerprint

impl Debug for Fingerprint

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

Formats the value using the given formatter.

impl Display for Fingerprint

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

Formats the value using the given formatter.

impl Eq for Fingerprint

impl Hash for Fingerprint

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 Fingerprint

fn eq(&self, other: &Fingerprint) -> 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 StructuralPartialEq for Fingerprint