I built family sync for my iOS expense tracker with zero backend — one purchase, the family joins

I built family sync for my iOS expense tracker with zero backend — one purchase, the family joins

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https://receiptiq.me/blog-family-sync-architecture
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How ReceiptIQ shares one subscription across 4 family devices with zero backend: StoreKit JWS verification against Apple's root CA, QR pairing that a screenshot can't steal, LWW sync invariants, and the MultipeerConnectivity bugs that shipped.

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