Every rare sat this address holds, scarcest first, with the tags it carries and the tier each tag sits in. The tag list is computed live from the chain when you query; the ranks and tiers come from the weekly full-chain rebuild.
Every tag gets a tier from its active B630k circulation — sats held by an address that has received bitcoin at or after block 630,000 (2020-05-11, the third halving). It is a proxy for sats that are not lost or dormant, measured per address, not per sat. Base is over 1,000,000 active sats and only single-dimension tags; Classic is 10,000 to 1,000,000; the S tiers are fewer than 10,000, 1,000, 100 and 10 — down to the last of its kind.
Sequestered means a sat sitting alone in a UTXO of 1,000 sats or less — deliberately isolated so it can be moved or listed on its own. Collectors are the distinct addresses holding sequestered sats, excluding addresses with more than 10 BTC, so exchanges, custodians and dormant early wallets stay out. Holders is every address holding one of these sats, most of them unaware. Ranks are per address, so a collector spread over several addresses ranks lower than they should.
Every good-number sat is listed — bare palindromes, alphas and omegas included. Definitions follow ord (Ordinal Theory) where ord defines them; the composites and the S-tier measurements are this site's own.