When v4 shipped, one detail stood out: hooks. Custom logic that runs directly at the point of exchange, not wrapped around it or bolted on top. Unipeg was the first attempt to show what that means. Arcpeg is the second, on a chain built for a different kind of money.
Each drawing is tied to a specific integer amount of aPEG: 1, 2, 3 and so on. Fractions are just aPEG. In the finished design a custom v4 hook renders every sheet entirely on-chain, no external storage, no IPFS, from a hash the swap itself produces: the paper, the compass, the arc and the original owner, fixed at the point of exchange.
That hash is the input. The renderer reads it and sets a compass down on blue paper. The arc is always drawn. The paper, the metal, the colour of the line and whatever was left on the desk are decided by the trade that made it. Every swap that touches the pool produces a new number. That number is what gets rendered.
An arc is a piece of a circle, and Circle built Arc. A peg is a rule enforced at the point of exchange, which is precisely what a v4 hook is. Gas here is a dollar, so the drawings are priced in dollars too.
Vol. 01 lives on Ethereum. Vol. 02 is drawn on Arc.
Every sheet is the same 24×24 grid Unipeg used. The compass and the arc are constant. The paper, the metal, the line and what was left on the desk belong to the market.
Preview seeds. Once the hook is live, a sheet's seed is a hash of the swap that made it and the block it landed in, and it never changes.
Fractions are just aPEG. The moment a balance crosses a whole number, a sheet exists for that number. Drop below it and the sheet is gone.