Struct LabelManager 

pub struct LabelManager { /* private fields */ }

Manages labeled Silent Payment addresses with O(1) per-output lookup.

BIP 352 labels allow a receiver to generate multiple addresses from a single scan/spend key pair. Each label index m produces a distinct address with a deterministic tweak.

Internally stores HashMap<PublicKey, (Scalar, u32)> where:

• Key: label_scalar * G (the label public key)
• Value: (label_scalar, label_index_m)

Implementations

impl LabelManager

pub fn new() -> LabelManager

Create an empty label manager.

pub fn add_label( &mut self, scan_secret: &ScanSecretKey, _spend_pubkey: &SpendPublicKey, m: u32, secp: &Secp256k1<All>, ) -> Result<(), CryptoError>

Register a label index m for scanning.

Computes the label tweak scalar via BIP0352/Label(b_scan || m), then derives the label public key (label_scalar * G) and stores it for O(1) lookup during output scanning.

Errors

Returns CryptoError if the label tweak produces an invalid secret key (computationally unreachable).

pub fn contains(&self, m: u32) -> bool

Check if a label index m has been registered.

pub fn len(&self) -> usize

Number of registered labels.

pub fn is_empty(&self) -> bool

Whether the manager has no registered labels.

pub fn to_btree(&self) -> BTreeMap<PublicKey, (Scalar, u32)>

Convert to BTreeMap for bdk-sp consumption.

This is an O(n log n) operation but only happens once per scan_transaction call, not per output.

Trait Implementations

impl Clone for LabelManager

fn clone(&self) -> LabelManager

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LabelManager

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

Formats the value using the given formatter.

impl Default for LabelManager

fn default() -> LabelManager

Returns the “default value” for a type.