Blackbox Devlog #9: Bitcoin support added! Plus, a purpose-built PCB Three developments this fortnight at three different distances from a shipping product: the new board is running, #Bitcoin is in as a new payment rail, and for the first time Blackbox has a custom-designed circuit board. Bitcoin payment support: - Receive-only, with no private key on the device; the merchant scans their Bitcoin wallet's public key and each sale derives a fresh receive address - Two distinct settlement states: SEEN means unconfirmed on the network; VERIFIED means the terminal has validated a cryptographic proof against block headers it audited itself, from a firmware checkpoint upward through proof of work and consensus rules. A connected server can help locate a payment; it cannot fabricate one - Sixteen test suites run against real mainnet and signet vectors - Disabled by default; running on signet until the hardware checkpoint passes First purpose-built PCB: - A circuit board designed around Blackbox's own requirements rather than repurposed from a development board - ESP32-S3, 5-inch 800x480 display, 4 layers, single 3.3V rail, printer, scanner, NFC, and microSD; 193 footprints, 125 nets, ERC clean and routed - Design generated from a source model: schematic, PCB, BOM, placement file, pinout doc, and firmware pin header all produced from two Python files, with automated checks re-validating pin assignments on every build - Errors caught before copper include a level translator wrong on all five signals, a shorted eFuse footprint, a printer inrush of 200A resolved with a Miller capacitor ramping it to 1.4A over 6.6ms, and over-voltage protection set to the printer's 9V limit - Not yet sent for fabrication; six blockers remain The new board is running: - The VIEWE S3 boots, renders, takes touch, and talks to the testnet indexer - First real action: resolved a merchant address to its funding block, verified against a prediction rather than accepted at face value - Printer confirmed working via its own self-test print before any firmware interaction - Scanner driver reworked: a non-responsive handshake no longer marks the scanner absent; the driver falls back to listen-only mode and reads decoded barcodes as plain text Light client sync start: - A light client needs to know where on the blockchain to begin; too low wastes hours, too high silently misses incoming funds while reporting healthy - Start height now has explicit provenance: pulled from the provisioning bundle if present, otherwise a one-time setup screen offers a live indexer lookup or manual entry - Manual entry validated asymmetrically: above the chain tip is refused, just under it warns; a failed lookup sets nothing rather than defaulting to zero Next: re-run light client bootstrap checks through a real scanner, complete the Phase 1 hardware checkpoint, take the first Bitcoin payment on the device over signet, and measure a panel for the PCB. Full devlog: blackbox.wyltekindustries.co…

Blackbox Devlog #7 The device lost its last server dependency, got live pricing back, and gained over-the-air firmware updates. Blackbox is now ready to migrate to new hardware. Server dependency removed ▪️Two-tier transport complete: device pairs with the merchant's phone by QR, resolves over mDNS, and routes everything through it — signing via a local TLS relay, chain reads and balance via a proxy on the phone ▪️No separate relay, indexer, or server required Six device-only bugs fixed at the live hardware checkpoint ▪️Board's 4 MB PSRAM enabled; receipts gained the Blackbox logo and a printed refund receipt Pricing ▪️Live pricing restored — background task feeds from Binance's CKB ticker crossed with a daily USD→fiat table, CoinGecko fallback with exponential backoff ▪️Six display currencies; quotes lock rate at strike; stale feed blocks new quotes; tapping checkout triggers an immediate refetch ▪️Quantization bug fixed: payment QR was rounding CKB to two decimals while the chain watcher required full precision — at any real rate, roughly half of paid sales would have gone unconfirmed. One quantization at quote-strike keeps QR, watcher, and receipt in exact agreement OTA updates ▪️v0.3.0 ships with a permanent factory updater partition — tap Update in Settings, device reboots into a 1 MB updater, browser on the LAN uploads new firmware and assets; bootloader falls back to the updater on a bad upload ▪️Existing v0.2.6 units migrate with no cable via web-OTA, which repartitions flash in place ▪️our brick vectors caught in review before hardware, including a cross-core cache race during a table write Next: OTA and migration hardware checkpoint, then the Fiber instant-settlement path. Blackbox is ready to migrate to the new board, new components, and eventually new housing. Full devlog: blackbox.wyltekindustries.co…