27 lines
1.1 KiB
Text
27 lines
1.1 KiB
Text
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pragma cashscript ^0.13.0;
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// CommitBox — the "commit" of a commit–reveal takeover
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// (Decentralized.DNS/DESIGN-covenant-registry.md §6.3).
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//
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// A taker creates one of these a block or more BEFORE taking a name over. Its
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// address reveals nothing: commitHash = hash256(name ‖ salt). The registry
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// covenant rebuilds this script from the taker's key hash and the revealed
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// salt, and requires input 1 of the takeover to be locked to it.
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//
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// The box enforces its own age (this.age), so a takeover cannot be assembled in
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// the same block as its commit, and it needs the taker's signature, so nobody
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// else can spend it out from under them.
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//
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// STATUS: chipnet draft, NOT REVIEWED — see name-registry.cash.
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contract CommitBox(bytes32 commitHash, bytes20 ownerPkh) {
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function spend(pubkey pk, sig s) {
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require(hash160(pk) == ownerPkh);
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require(checkSig(s, pk));
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require(this.age >= 1);
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// The commitment is data, not logic: it only has to be part of this
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// script so that it is part of the address. (The compiler rejects an
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// unused constructor argument.)
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require(commitHash.length == 32);
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}
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}
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