Slice the UTXO set and address population by age, amount, output type, halving epoch, or holder classification (STH/LTH). Build complex cohorts by combining filters for metrics like "realized cap of 1+ BTC UTXOs older than 155 days."

Key Features

Age-based: TimeFilter::GreaterOrEqual(155), TimeFilter::Range(30..90), TimeFilter::LowerThan(7)
Amount-based: AmountFilter::GreaterOrEqual(Sats::_1BTC), AmountFilter::Range(Sats::_100K..Sats::_1M)
Term classification: Term::Sth (short-term holders, <155 days), Term::Lth (long-term holders)
Epoch filters: Group by halving epoch
Type filters: Segment by output type (P2PKH, P2TR, etc.)
Context-aware naming: Automatic prefix generation (utxos_, addrs_) based on cohort context
Inclusion logic: Filter hierarchy for aggregation (Filter::includes)

Filter Types

pub enum Filter {
    All,
    Term(Term),           // STH/LTH
    Time(TimeFilter),     // Age-based
    Amount(AmountFilter), // Value-based
    Epoch(HalvingEpoch),  // Halving epoch
    Type(OutputType),     // P2PKH, P2TR, etc.
}

Core API

let filter = Filter::Time(TimeFilter::GreaterOrEqual(155));

// Check membership
filter.contains_time(200);  // true
filter.contains_amount(sats);

// Generate metric names (via CohortContext)
let ctx = CohortContext::Utxo;
ctx.full_name(&filter, "min_age_155d");  // "utxos_min_age_155d"

Built On

brk_error for error handling
brk_types for Sats, HalvingEpoch, OutputType
brk_traversable for data structure traversal