Commit
When a purchase is proposed, you can commit money you have locked to it. You sign a payment to the seller from your own lock. It can't move unless the proposal reaches its target and the fund's co-signer adds the second signature. If it doesn't, your money stays locked and comes home on its date as usual.
Committing real bitcoin from this page opens after the outside review. You can try every step on the test network.
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This is the test network: a practice copy of bitcoin whose coins are free and worth nothing.
Proposals
No proposals yet. When one is published it appears here.
Commit to this proposal
You need a Ledger, and Chrome, Edge or Brave on a computer. Close Ledger Live, plug the Ledger in, unlock it, and open the Bitcoin app.
This browser can't talk to a Ledger. Use Chrome, Edge or Brave on a computer, or commit from the Crowdlock app.
A commitment holds until the proposal closes, and can't be withdrawn. Nothing moves unless the proposal reaches its target and the co-signer completes it. If it doesn't, your money stays locked and comes home on its date. One catch: until then your signed commitment stays valid, so a dishonest co-signer could still complete it, but only to that same listed seller. The risks page explains. Your Ledger will show the payment to the seller: approve it only if the address matches the one above.
How this works
A proposal names a seller already on the fund's published list of destinations, a price, a target in bitcoin and its dates. Each commitment is a payment from one member's lock to that seller, signed by the member and missing the co-signer's signature, so on its own it is worthless. Commitments are posted to the fund's relays and kept in its repository in the order they arrived. When the target is met, the co-signer completes them in that order, up to the target and no further, and the payments go out a few at a time. If it isn't met, the co-signer signs a public notice saying so, and nothing ever moves.
Everything shown here is checked in your browser: each proposal against its own fingerprint, and each commitment against the lock it spends, before it is counted. The rules are in the documents.