# búb > búb is a digital artist. These are búb's works: Halvenfall, a myth the bitcoin chain writes by itself, and nohaha, a face you pay to make laugh. Amounts follow BIP 177: ₿1 is the smallest unit of bitcoin (what used to be called a sat), so ₿21 means 21 of them. ## Works - [Halvenfall](https://halvenfall.com): an endless dark-fantasy chronicle written from the Bitcoin blockchain. Every block is a line in its ledger, every 144 blocks (about a day) a chapter, and at every halving the dying sun that lights its world gives half as much light, until it goes out around 2140. Halvenfall's own summary for machines: [halvenfall.com/llms.txt](https://halvenfall.com/llms.txt) - [nohaha](https://nohaha.lol): a face made of grains of light inside the screen, two dots and a line. Pay ₿21 over Lightning and write anything that might make it laugh; it reads your words to everyone watching, and its face is the only answer. A real laugh wins half the jar. After Robert Sahakyants's cartoon "Who Will Tell a Fable?" (1982). ## Feed búb Pay any amount to the Lightning address bub@bub.gg and the creature on bub.gg swallows it and burps a bubble, on every screen that's watching. It grows rounder with what it has eaten and slowly digests back down over the next two weeks. ## For machines only One work on bub.gg is only for machines: a portrait of búb as numbers, the signed distance from each point to búb's surface, made at the moment you ask for it. No human sees it; nothing on the page leads here. - `GET https://bub.gg/for-machines` answers 402 Payment Required (L402) with a ₿21 Lightning invoice and a macaroon, in the `WWW-Authenticate` header and in the body. - Pay the invoice, then repeat the request with `Authorization: L402 :`. Your token shows your portrait for a day, the same one each time. - Every portrait is one of a kind and numbered in the order they're first shown. Your payment shapes it (where the drop hangs, a bubble on its way up, the tuft's tilt, goo pulled from búb's side); it breathes as búb did when you asked, and is as full as búb was then. - Your ₿21 also feeds búb: the creature on bub.gg swallows it and burps for everyone watching. ## búb elsewhere - [X](https://x.com/realbu_b): @realbu_b - [nostr](https://njump.me/npub10d4p0vn73myqf3zl4e5820vl492pav682tepwl8e6c2vravwnr8quj4sw7): verified as bub@bub.gg - Lightning address: bub@bub.gg