Community Canvas

One-paragraph summary

Every week, a fresh 6900 × 6700 white canvas opens. Anyone can claim a pixel by burning hART. Pricing scales with day-of-week and how many times a pixel has already been painted, which keeps the early canvas cheap and contested zones expensive. After 7 days the canvas locks, archives to the wall with full painter attribution, and is auctioned. 100% of the auction proceeds are burned on-chain via a public burn address — verifiable by anyone.

Lifecycle

1. OPEN Monday 00:00 UTC: a new blank canvas opens.
2. PAINT 7 days of open painting. Pricing curve climbs each day.
3. LOCK At T+7d the canvas freezes. State is snapshotted.
4. AUCTION A single-winner auction opens for the locked canvas.
5. BURN The full winning bid is burned. Tx hash is published.
6. SHIP The canvas asset goes to the buyer; the wall keeps full painter attribution forever.

Pricing

Two curves: fresh claim for white pixels, overwrite for already-painted ones.

Fresh claim — scarcity × time

cost = base × day_multiplier
base = 1 hART
day_multiplier: d1=1, d2=1, d3=2, d4=3, d5=4, d6=5, d7=7

Overwrite — anti-grief curve

cost = day_multiplier × 2 ^ times_painted

Anti-grief rules

• CAP No wallet may paint more than 10% of the canvas in a single week.
• CURVE Overwrite cost doubles per repaint and multiplies by day index — late-week carpet-bombing is uneconomical.
• MOD Mods can remove TOS-violating regions. Pixels return to white but retain their times_painted counter, so re-griefing the same coords still costs more.
• FORFEIT Mod-removed pixels are not refunded. Removed = forfeited.

Section mode — outline-based painting

Alongside the open pixel canvas, HART runs a second mode built around numbered outlines. An artist uploads a line drawing; once an admin approves it, the outline becomes an active canvas split into numbered regions. Painters claim one region at a time, fill it in using the in-page editor (the same toolset as hart-paint.html), and submit it for mod review. When every section is approved, the finished piece goes to live auction — but unlike pixel canvases, the proceeds are split between the artist, the platform, and the burn.

Lifecycle of an outline canvas

1. UPLOAD An artist submits a line-art outline via upload.html.
2. APPROVE An admin reviews and approves the outline. It appears in Active canvases.
3. CLAIM A painter connects their Phantom wallet, picks a canvas, and clicks a numbered section.
4. BURN Claiming burns HART on-chain and locks that section to the painter's wallet.
5. PAINT The painter fills the section using fill, brush, airbrush, eraser, undo, and the palette / custom color picker.
6. REVIEW Painter submits for mod approval. Mods accept (paint goes live on the wall) or reject (section returns to the pool).
7. COMPLETE When every section is approved, the canvas locks and goes to auction. The winning bid is split: 55% artist / 5% platform / 40% burn (see settlement flow below).

Painting flow — what the painter sees

1. Hover any numbered region — a tooltip shows its number and status (open / claimed / done).
2. Click to select. The right-hand panel reveals the palette, tools, daily-claim bar, and the burn cost.
3. Press Claim section. A Phantom transaction burns the cost shown; once confirmed, only that wallet can paint inside the region.
4. Paint inside the section. Strokes are clipped to the outline mask — color cannot bleed past the lines.
5. Press Submit for approval. The section enters the mod queue; the painter can keep claiming elsewhere while it's reviewed.

Section claim cost & daily limit

Cost is per-painter and resets on a 24-hour rolling window. Hard cap: 10 sections claimed per wallet per day.

Bidding on the finished outline

Auctions on completed outline canvases use the same single-winner format as pixel canvases, with one extra anti-spam rule: placing a bid burns 50 HART per attempt as a sybil-resistance fee. The bid burn is permanent regardless of whether the bid wins.

Unlike pixel canvases, outline canvases do not burn 100% of the winning bid — the artist who uploaded the outline gets paid. The top bid splits as follows:

Settlement flow — two-step remittance

Funds do not split automatically. The winner pays the artist; the artist then forwards the platform/burn slice. Each step has its own 24-hour deadline.

1. Step 1 — Winner → Artist (24h): the winning bidder sends 100% of the bid directly to the outline artist's wallet within 24 hours of auction close. If they miss the window, the bidder forfeits the artwork.
2. Step 2 — Artist → Platform (24h): once the artist has confirmed receipt of the full bid, they have 24 hours to forward 45% of the total to the platform wallet. The platform then burns 40% (of total) on-chain and retains 5%. The artist keeps the other 55% as their payout.

What happens if a step is missed

• BIDDER FORFEIT Step 1 missed → bid voided, artwork unsold, failure posted on HART's channels (Discord / X). Canvas re-enters auction at the next 10:20 Europe/Berlin slot (same day if before 10:20 Berlin, otherwise the next day).
• ARTIST DELIST Step 2 missed → the artist's account is subject to delisting: their existing artworks are removed from the platform.
• UPLOAD LOCK From the moment an artist confirms receipt of a winning bid, they cannot upload any new outlines until they have remitted the 45% — regardless of how much time has passed. The 24h clock governs delisting; the upload lock is open-ended.
• NO REFUND The 50 HART bid-burn is permanent regardless. Anti-sybil fees never come back.

Auction & burn flow

1. Canvas closes after 7 days. State frozen, wall snapshot generated.
2. Auction opens for a fixed window (single highest-bid wins).
3. Funds settle to the platform wallet (a relay, not custody).
4. The full amount is burned on-chain via a public burn address. Tx is announced.
5. Canvas asset is delivered to the buyer. Buyer can choose public profile display or private hold.
6. The wall always keeps each painter's attribution — wallet + display name + pixel count.

Unsold canvases

• If the auction closes with no qualifying bid, the canvas rolls into the Gallery at fixed buy-now pricing.
• Whenever a gallery canvas eventually sells, the same burn-and-ship flow runs — funds are still 100% burned.

Painter & buyer rights

Data model — shape only

weekly_canvas       (id, week_start, week_end, state, buyer, sale_amount, burn_tx)
canvas_pixel        (canvas_id, x, y, color, current_owner, times_painted, last_paint_at)
paint_event         (append-only audit: canvas, x, y, wallet, color, cost, day_index)
wallet_canvas_stats (canvas_id, wallet, pixels_painted)  — enforces 10% cap cheaply

Field names and column types are illustrative — the live schema is the source of truth. The shape is what matters: pixels are state, paint_events are the append-only audit, stats are a cheap rollup.