On-chain pages · Cobblr Labs 🐧

How it works

1WriteOne HTML file, up to 4096 bytes. No images or extra files, so it has to be small and clever.

2StoreAn AccountSet with the AppLoader field puts the file on the account. The fee is 1 drop per byte.

3Servepwa.exposed/<address> sends you to that account's own subdomain, which serves the bytes from the validated ledger.

4Go liveInside, the page talks to a public testnet node over WebSocket and shows live ledger data. It never asks for keys.

Network feature: PWALoader · testnet amendment

PWALoader is a testnet-only amendment for now. That's why these pages stay testnet toys until it launches on mainnet.

Live on-chain pages

Two Labs mint parties have their pages on the ledger: the Mystery Box recap and the Bolt Buddies gallery. Each page is stored on that mint party's own account (Bolt Buddies keeps its pixel-art code on a second one). The upload receipt is the transaction that put the current version on the ledger.

Testnet toy · recap

🎁 Labs Mystery Box recap

The Drop 2 recap of the Labs Mystery Box: how it worked and the story with tx links, stored on the box account itself. The collectors were simulated wallets run by the demo. When this node's history window has been reset, the live card list shows an in-page note instead of empty rows.

Open on pwa.exposed ↗

Link: pwa.exposed/rBRDxWBaVex1pRYyQrKLFKa8uiyjhg396E
Account: rBRDx…g396E (testnet) · 4052 of 4096 bytes · version 5
Upload receipt: AccountSet 8DA299DC…91B2 ↗
The full story on this site →

Captured Oct 19, 2026.

Testnet toy · sold out

🤖 Bolt Buddies

A sold-out collection of 100 robot cards minted by a Hook with on-chain RNG. The page loads robots live from the owners' wallets (account_objects URITokens), and keeps the pixel art on a second testnet account so the gallery still fits the 4 KB AppLoader limit.

Open on pwa.exposed ↗

Link: pwa.exposed/rfs1kpnaf5rAk5intonTwMRKKBYnGZb4D1
Account: rfs1k…GZb4D1 (testnet) · 3557 of 4096 bytes · version 4 · art chunk on a second account
Upload receipt: AccountSet 25160C66…DF60 ↗
The full story on this site →

Captured Oct 19, 2026.

The Mystery Box recap shows an in-page note when this public testnet node's history window has been reset (so the live cards aren't on that node). Bolt Buddies robots load live from the owners' wallets via account_objects; the pixel art lives on a second account. Screenshots above are from Oct 19, 2026.

Example: one site, three accounts

One account holds 4096 bytes at most. To build something bigger, we split a small site across three testnet accounts and let the browser put it back together. The result is 10,330 bytes, about 2.5 times the limit for one page.

Screenshot of the on-chain mini site stitched from three testnet accounts

Testnet toy · multi-account

⛓️ Cobblr Labs, on-chain

A four-section mini site (home, on-chain pages, how it works, live ledger). The loader page reads the other two parts straight from the ledger, checks each one against a SHA-256 hash pinned inside the loader so a swapped part is refused, then adds the styles and runs the script.

Open the mini site ↗

Link: pwa.exposed/rBXkjVQ7H534S6RQL38Y21oxYVG3M1BQky

Captured Oct 18, 2026.

part	account	bytes	upload receipt	what it holds
A · loader	rBXkj…BQky	2423	F1D7E76F…	The page the portal serves. Reads B and C from the ledger and checks their hashes.
B · styles + markup	rHPU4…F7k9	3824	21F8222B…	CSS and the HTML for the site’s sections.
C · script	rQps6…DiQ1	4083	8C025F35…	Navigation, the live ledger ticker and the page list, plus the how-it-works text.

What we tried for joining pages

The portal runs every page in a sandbox on its own subdomain, with no CORS headers, Cross-Origin-Resource-Policy: same-origin and X-Frame-Options: DENY. We tested each way of loading one account's page from another, in headless Chrome, against both the pwa.exposed link and the account's subdomain:

method	result
fetch()	blocked (no CORS headers)
<script src>	blocked (resource policy)
<link rel=stylesheet>	blocked (resource policy)
<iframe>	blocked (X-Frame-Options: DENY)
Read the page from the ledger over WebSocket	works

Next: mainnet

PWALoader only runs on Xahau testnet today. When PWA pages launch on mainnet, the plan is to move these pages there and update the links on this page. Until then, everything here is a testnet toy.