# spaceblocks.art

Space Blocks: a 1 MiB image on Bitcoin, inscription #83,851,681, 1,047,584 bytes, in one transaction of 26 % of a block's weight limit.

URL: https://blockspace.wiki/projects/spaceblocks.art/

Status: live (since 2026-10-19)
Site: https://spaceblocks.art

## What it is

spaceblocks.art is the home of [Space Blocks](https://blockspace.wiki/glossary/space-blocks/). In its own words: "A 1 MiB image on Bitcoin: inscription #83,851,681, 1,047,584 bytes, in one transaction of 26 % of a block's weight limit."
Its second page, "Whole-block works", lists the inscriptions block.space
classes as [whole-block](https://blockspace.wiki/glossary/whole-block/).

## Status

Live at https://spaceblocks.art since 2026-10-19 (as of 2026-10-20).

## How it works

It is a static site, built from block.space's public API
(https://block.space/api/largest-inscriptions), with the thumbnails copied
into the site, so the pages load nothing from another origin. The Space
Blocks facts are fixed and checked against block.space on each build. The
site is rebuilt daily at 00:40 UTC. Its whole-blocks page lists the
[whole-block](https://blockspace.wiki/glossary/whole-block/) works, largest first.

## Key figures

From the site's build of block 972,262:
- inscription #83,851,681, block 881,188;
- 1,047,584 bytes, 99.9 % of 1 MiB; JPEG, 1537 × 1537;
- its transaction weighs 1,054,167 WU, 26.4 % of the 4,000,000 WU limit; its block held 337 transactions, 3,992,678 WU (read from block.space's API);
- rank #157 of the 100,000 largest inscriptions on block.space;
- 110 whole-block works listed on the whole-blocks page.

## Glossary

- **block weight**: A block's size as consensus counts it, in [weight units](https://blockspace.wiki/glossary/weight-unit/): every non-witness byte weighs 4 WU and every witness byte 1 WU, and a block may weigh at most 4,000,000 WU.
- **inscription**: Content bound to a sat by ord, carried in a witness envelope. Under BTI's law the inscription is content, not a token: the inscribed sat is the token that claims the bytes.
- **inscription number**: An [inscription](https://blockspace.wiki/glossary/inscription/)'s position in the ordering of all inscriptions: #0 was the first, at block 767,430, and [cursed inscriptions](https://blockspace.wiki/glossary/cursed-inscription/) carry negative numbers (the first was −1, at block 774,411). The number labels the artifact, the file, not the token or sat that owns it.
- **size class**: block.space's label for an [inscription](https://blockspace.wiki/glossary/inscription/) by the size of its content. **Large** is over 400,000 bytes, "bigger than standard relay allows; mined by direct submission" (see [standard transaction](https://blockspace.wiki/glossary/standard-transaction/)). **[whole-block](https://blockspace.wiki/glossary/whole-block/)** is over 3,500,000 bytes, and every whole-block inscription is also Large. Space Blocks, at 1,047,584 bytes, is Large.
- **Space Blocks**: Inscription #83,851,681: one JPEG, 1537 × 1537, of 1,047,584 bytes (99.9 % of 1 MiB), inscribed in block 881,188 in one transaction of 1,054,167 WU, 26.4 % of the [block weight](https://blockspace.wiki/glossary/block-weight/) limit. Its own line: "A 1 MiB image on Bitcoin: inscription #83,851,681, 1,047,584 bytes, in one transaction of 26 % of a block's weight limit." The image shows a glowing cube of circuitry marked 1MB floating in space, captioned SPACEBLOCK.
- **whole-block**: block.space's size class for an [inscription](https://blockspace.wiki/glossary/inscription/) whose content is over 3,500,000 bytes (one over 400,000 bytes is "large"). spaceblocks.art's page "Whole-block works" lists the inscriptions block.space classes as whole-block: 110 as of block 972,262. [Space Blocks](https://blockspace.wiki/glossary/space-blocks/) itself, at 1,047,584 bytes, is below this class; its [size class](https://blockspace.wiki/glossary/size-class/) is Large.

## FAQ

### What is Space Blocks?

[Space Blocks](https://blockspace.wiki/glossary/space-blocks/) is inscription #83,851,681: one JPEG, 1537 × 1537, of 1,047,584 bytes, inscribed in block 881,188.

### Does it really fill a block?

Its 1,047,584 bytes are 99.9 % of 1 MiB (1,048,576 bytes). As witness data each byte weighs 1 WU, so its transaction weighs 1,054,167 WU, 26.4 % of the 4,000,000 WU [block weight](https://blockspace.wiki/glossary/block-weight/) limit. Its block, 881,188, held 337 transactions and weighed 3,992,678 WU.

### What are the other works on the site?

The page "Other works that fill a block" lists the inscriptions block.space classes as [whole-block](https://blockspace.wiki/glossary/whole-block/), content over 3,500,000 bytes: 110 of them as of block 972,262, largest first, each linking to its record on block.space.

### Who made it?

No source names an artist or gives a story (as of 2026-10-20), so the site shows only the facts.

Sources:

- The project list at block.space/projects · https://block.space/projects
- The spaceblocks.art site: README, index.html, whole-blocks/ and tools/build.py · https://spaceblocks.art
- Blockspace Holdings records

Updated: 2026-10-20