# Collections

NFT collections on Bitcoin, ranked by the blockspace their members consumed, each with its membership source: chain, index or asserted.

URL: https://blockspace.wiki/concepts/collections/

A **collection** on block.space is a set of NFTs with a membership source.
[block.space/collections](https://block.space/collections) ranks them by
blockspace, the way every board does: by [Book A](https://blockspace.wiki/glossary/book-a/) by default, with the
same book (A, B, C) and unit toggles, shown in MB. A collection's bytes are
the sum of its members' books, as of the books height. Fungible tokens are
left out, even when they are grouped (BRC-20 and TAP deploy parents, for
example).

## Where membership comes from

Every row says how its members were found, its **provenance**:

| provenance | what it is | examples |
|---|---|---|
| chain | written on Bitcoin itself | Ordinals parent and child inscriptions; SRC-101 roots |
| index | defined by a protocol's own index | Atomicals containers; Counterparty subasset families |
| asserted | a published list, named with its source | the Degent Club collection list |

An asserted list is never merged with a chain group. Many well-known
collections have no on-chain parent at all; they enter only as asserted
lists, each named with its source.

## Names

A chain group is named by its parent's own title, or else "Children of
#<parent number>". The others take their subasset family name, container
name or list name. A name with no source shows the parent's number.

## What the board shows

Each row has its rank, a square (the parent's thumbnail or the first
member's), the name, the family, the provenance, the member count, the
bytes under the chosen book, and its share of collected NFT blockspace.
Each collection has a detail page with its members by size and the top
holders of its bytes, from the [holders appendix](/concepts/holders/).

## Figures

As of the board's build on 2026-10-20 (books at block 972,299), the
largest collection by Book A is the Degents of
[degent.club](/projects/degent.club/), an asserted list: 4,112 members,
1,518.9 MB in Book A, 27.7 % of the collected NFT blockspace on the
board. The data behind the board counted 81,567 collections, with
3,354,742 members.

The API is
[https://block.space/api/collections](https://block.space/api/collections),
in the shared envelope (see [the boards API](/data/block-space-api-boards/)).

Sources:

- block.space: the largest NFT collections on Bitcoin, by blockspace · https://block.space/collections
- block.space collections API · https://block.space/api/collections
- Blockspace Holdings records
- block.space docs: rankings · https://block.space/docs/rankings

Updated: 2026-10-20