CompassCompass

A contract cannot read its own transaction hash, so each parcel is seeded from values the minter cannot predict:

seed = u32(sha256(
  env::random_seed()
  ‖ token_id ‖ minter
  ‖ block_height ‖ nonce))

random_seed is the block’s VRF output mixed with the receipt. Seeds are unique; a collision re-hashes with the next nonce.

nft_token builds the SVG at read time from the seed and the live state: survey drift, trade routes, beacon, survey lines, sea level, zoom and flag. nft_svg returns the raw SVG; preview_svg renders any input.

This website draws the same bytes with a TypeScript mirror of the Rust renderer, so galleries never wait for RPC. A parity test compares both across thousands of inputs, and every Atlas page can verify its parcel against the chain.

media is a data:image/svg+xml;base64 URI and media_hash is the sha256 of that SVG. No IPFS, no gateway, no server: the image is a pure function of chain state and always matches it. The Earth comes from a 0.5° Natural Earth land mask (public domain) stored in the contract.

The metadata is live: media, media_hash and extra change whenever the art changes, so indexers should re-read nft_token rather than cache it forever.

Each mint keeps the parcel’s storage plus 600 bytes of headroom (about 0.011 NEAR together) out of the price. Both stay locked in the contract, so later transfers, sales and approvals never eat into revenue. The rest is revenue: about 0.489 NEAR per parcel at a 0.5 NEAR price.

Revenue is withdraw-only: it leaves solely through the owner’s withdraw, never to the contract itself and never below storage plus a 1 NEAR reserve. get_mint_cost quotes max(price, 0.02 NEAR) per parcel; anything unused is refunded.

There is no prize pool, no treasury spend and no upgrade method.

Region, district, road, scale, ink, style, provinces, heading, drift, rhythm and rarity tier come from the seed; the tier chooses the ink. Dynamic attributes follow the live state. Rarity rank is the sum of 1 / frequency over the static traits.

Accounts are readable names such as alice.near or alice.testnet, or implicit 64-character hex ids. The collection lives on its own account, separate from the owner’s wallet.

Sensitive calls such as transfers, delists and every owner action attach exactly 1 yoctoNEAR (10^-24 NEAR). That requires a full-access key, so your wallet always asks you first.

Gas is prepaid at 0.001 NEAR per Tgas and the unused part is refunded; what is burnt is about 0.0001 NEAR per Tgas. A mint or a bag attaches up to 300 Tgas, so keep about 0.3 NEAR spare beyond the price. Most of it comes back.

Stored data locks 1 NEAR per 100 kB for as long as it exists. That is why a listing carries a small, refundable deposit.

A block every 0.6 seconds, final in about 1.2 seconds. An epoch is 43,200 blocks, about 7.2 hours: one step of survey drift.

Testnet uses free test NEAR from a faucet and has no value. Mainnet is the real network. The collection is identical on both; only the account and the wallets offered differ.