29 lines
920 B
TypeScript
29 lines
920 B
TypeScript
// m [pubKeys ...] n OP_CHECKMULTISIG
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const bscript = require('../../script')
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const types = require('../../types')
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const OPS = require('bitcoin-ops')
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const OP_INT_BASE = OPS.OP_RESERVED // OP_1 - 1
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function check (script, allowIncomplete) {
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const chunks = bscript.decompile(script)
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if (chunks.length < 4) return false
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if (chunks[chunks.length - 1] !== OPS.OP_CHECKMULTISIG) return false
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if (!types.Number(chunks[0])) return false
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if (!types.Number(chunks[chunks.length - 2])) return false
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const m = chunks[0] - OP_INT_BASE
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const n = chunks[chunks.length - 2] - OP_INT_BASE
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if (m <= 0) return false
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if (n > 16) return false
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if (m > n) return false
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if (n !== chunks.length - 3) return false
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if (allowIncomplete) return true
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const keys = chunks.slice(1, -2)
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return keys.every(bscript.isCanonicalPubKey)
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}
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check.toJSON = function () { return 'multi-sig output' }
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module.exports = { check }
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