Crowdfund

⚠️ Experimental — generated with no human supervision by the daily MCP pipeline (Solidity→Gno port). Not audited. See r/moul/x/daily.

A gno.land realm port of the classic Solidity Kickstarter-style crowdfunding contract. It keeps the same lifecycle — launch a campaign with a goal and a deadline, let backers pledge and unpledge, then either let the creator claim on success or let backers refund on failure — but models everything as plain uint64 accounting (no real coin transfer), the idiomatic Gno equivalent of the Solidity mapping(address => uint) balances.

Deadlines use runtime.ChainHeight() (block height) instead of block.timestamp, msg.sender becomes unsafe.PreviousRealm().Address(), require becomes panic, and campaigns live in an ordered avl.Tree so Render lists them deterministically with a ▓░ progress bar.

Transactions

• Launch(goal uint64, durationBlocks int) int — create a campaign (returns id); deadline = current height + duration.
• Pledge(id int, amount uint64) — back a campaign before its deadline.
• Unpledge(id int, amount uint64) — withdraw part/all of your pledge before the deadline.
• Claim(id int) — creator claims funds after the deadline if pledged >= goal.
• Refund(id int) — backer reclaims their pledge after the deadline if the goal was missed.

Example

Launch(1000, 100)      // campaign #1, goal 1000, ends 100 blocks from now -> returns 1
Pledge(1, 400)         // back campaign #1 with 400
Pledge(1, 700)         // total now 1100 (>= goal)
Unpledge(1, 100)       // change of mind: total back to 1000
// ... after block height passes the deadline ...
Claim(1)               // creator claims 1000 (goal met)

Read-only Render("") shows every campaign with its progress bar, goal, pledged total, deadline block and state (Active / Funded / Funded (claimed) / Failed).

What changed in v1

State moved from a hand-rolled avl.Tree + nextID + zero-padding helper to p/moul/kit/store, which keys entries by seqid instead of a fixed-width decimal string.

v0 padded ids to width 12. Past that width the padding stops and the tree orders "1000000000000" before "999999999999", so every list this realm renders would be wrong from that entry on. store keys are 8 big-endian bytes whose order is numeric for every uint64, so there is no width left to outgrow.

Campaign loses its ID field, which the store now owns, and the realm's local mustGet becomes one line: the store's labelled MustGet panics campaign #7 not found where v0 said only campaign not found. Each campaign keeps its own address-keyed pledges tree, which the store does not cover. Campaign ids already started at 1, so nothing shifts.

This is a storage change, which under this repo's versioning rule is a compatibility change, hence a new version rather than an edit in place. v0 stays live and untouched.

Part of moul/gno-contracts — moul's versioned gno.land contracts. See the repository for the full catalog, build/test tooling, and usage.

Dependency graph:

🧪 Highly experimental — potentially vibe-coded. Not audited; may break, change, or be removed at any time. Do not use with anything of value. Full disclaimer: DISCLAIMER.