The law of the wall.

1 · The wall

The wall is a grid of cells, its width and height fixed at deploy. Each cell holds one colour from a fixed palette, engraved at deploy, the same for every wall. The whole state lives on-chain and can be read by anyone in a single call: there is no server between you and the wall.

A wall starts blank. It stays open until its hanging block, which is known in advance, and then it is hung and a new blank wall begins.

2 · Painting

One call: a cell, a colour. The contract computes the current price of that cell, takes it in $MURAL, burns it in the same transaction, writes the colour, raises the cell's heat by one and records you as its last painter.

Anyone can paint over any cell, at any time the wall is open, including a cell painted a second ago. The only defence a pixel has is its price.

3 · The price

Every cell has a heat: the number of times it has been painted on the current wall. The price of a cell is a base price multiplied by a rising function of its heat, both set at deploy. A cell nobody wants is close to free; a cell everyone fights over gets expensive, and every coat paid for is burned.

Heat resets to zero when the wall is hung. Every new wall starts calm.

4 · The cooldown

Between two strokes from the same address, a minimum number of blocks has to pass, set at deploy. It is short enough not to slow a person down, and it stops a script from repainting a whole line in one block. The price does the rest.

5 · Hanging

At the hanging block, anyone can call hang(). The contract freezes the state, records its hash, publishes the count of cells each painter held at that moment, and only then wipes the wall. The image of a hung wall is generated on-chain, on demand, from the frozen state: no file is stored, no server holds a copy that could differ.

If nobody calls hang() at the block, the wall simply stays open and strokes keep counting until someone does. A late call changes the date, never the rule.

6 · The gallery

Every hung wall is addressable: its number, its hash, its image, its credits. The gallery is the list of them, readable without any server, forever. There is no pot behind a wall and no prize for painting it. What you get is a pixel while it lasts, a place on the hung wall, and a name in the credits.

7 · Invariants

These hold on every block. If any of them fails, the contract is wrong, not the rule.

8 · What can go wrong

The content

A public wall receives whatever people paint, including things that are hateful, fraudulent or illegal. The contract moderates nothing and cannot. This site can apply a display mask on the client side, a public and versioned list of blurred zones, without ever touching the state. The wall itself stays what people made of it.

The scripts

The cooldown and the price make a bot war expensive, not impossible. A large holder can own a corner of the wall for a while; the rest of the wall stays open. That is the game.

The empty wall

If nobody paints, the wall stays blank and the hung wall is blank too. There is no mechanical fix, and a blank hung wall is shown as a blank hung wall.

The missed hanging

Nobody is obliged to call hang(). Until someone does, the wall stays open past its block. The rule does not change, only the date.

9 · Parameters

Every parameter is a constant of the deployment. Their values are published on this page at launch, and they never change afterward.

10 · Chain and venue

Mural runs on Robinhood Chain, chain id 4663 (0x1237), an Ethereum L2 on the Arbitrum Orbit stack. Gas is paid in ETH, at a gas price around 0.02 gwei on this chain, which is what makes a wall of pixels possible at all: a stroke is one storage write, and on this chain a storage write costs a fraction of a cent.

The hook

The Mural hook does one thing: after every swap, it sends a fixed share of the swap to the buy-and-burn contract, which buys $MURAL on the pool and burns it. The hook keeps no data per address and has no idea who is trading. Painting and hanging are direct calls to the wall contract, not swaps.

11 · Launch

No launchpad. $MURAL launches directly in its own Uniswap v4 pool on Robinhood Chain. The initial liquidity position belongs to the protocol and is locked in a locker with no withdraw function, verifiable on the explorer; the fees it collects follow the same path as the toll. During the first blocks, an extra launch toll decays to zero, so a snipe pays full price.