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| export class WormChain {
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| constructor(namespace = 'sovereign') {
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| this.key = `sk-worm-${namespace}`
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| this.prev = this._loadLast()
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| }
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| _loadLast() {
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| try {
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| const chain = JSON.parse(localStorage.getItem(this.key) || '[]')
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| return chain.length ? chain.at(-1).seal : '0'.repeat(64)
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| } catch { return '0'.repeat(64) }
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| }
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| async seal(event, payload) {
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| const chain = JSON.parse(localStorage.getItem(this.key) || '[]')
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| const ts = Date.now()
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| const raw = JSON.stringify({ event, payload, ts, prev: this.prev })
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| const seal = await this._sha256(raw)
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| chain.push({ seq: chain.length, event, ts, prev: this.prev, seal })
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| localStorage.setItem(this.key, JSON.stringify(chain))
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| this.prev = seal
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| return seal
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| }
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| verify() {
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| const chain = JSON.parse(localStorage.getItem(this.key) || '[]')
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| for (let i = 1; i < chain.length; i++) {
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| if (chain[i].prev !== chain[i - 1].seal)
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| return { valid: false, length: chain.length, broken: i }
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| }
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| return { valid: true, length: chain.length }
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| }
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| length() {
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| return JSON.parse(localStorage.getItem(this.key) || '[]').length
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| }
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| async _sha256(str) {
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| const buf = await crypto.subtle.digest('SHA-256', new TextEncoder().encode(str))
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| return Array.from(new Uint8Array(buf)).map(b => b.toString(16).padStart(2,'0')).join('')
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| }
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| }
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|
