BALANCE
-- SATS
≈ $-- USD
tap to copy address
NO WALLET

Generate a key pair to begin. Your private key never leaves this device.

LIVE PRICE
1 BSV = ...
SEND BSV
≈ $0.00 USD

TX signed in browser. Key never transmitted.

YOUR ADDRESS
No wallet — go to WALLET tab
RECEIVE OFFLINE TX

Receive a signed transaction from someone with no internet:

RELAY NODE: Receive signed TXs from offline peers → broadcast when connected. A signed TX is ~200 bytes. It travels on any medium. Only needs internet at the final hop.
HOW IT WORKS
1. Sender signs TX offline (secp256k1 math, no server)
2. Signed TX = ~250 bytes of hex data
3. Data hops peer→peer via QR / Audio / NFC / BT / Light
4. Any node with internet broadcasts to BSV network
5. Confirmed. Value transferred. No bank. No carrier.

TXID is deterministic at signing. Recipient can trust it before broadcast. Sender can't double-spend if relayed promptly.
■ QR CODE — Most Universal
Works on every device with any camera. No APIs needed beyond canvas. Works 100% offline. Most reliable option in a crisis.
Ready
🔊 AUDIO — Bell 202 FSK Modem
1200Hz=0, 2200Hz=1, 300 baud. Every phone ever made has a speaker and mic. Works in darkness, through walls, across rooms.
Ready
📡 NFC — Magnetic Induction
Tap two phones together. Chrome Android only. 4cm range. Full TX in under 1 second. Zero infrastructure, pure physics.
Ready
🔵 BLUETOOTH — 100m Range
Web Bluetooth API. Chrome Android + Desktop. Device to device without internet. The mesh propagates outward node by node.
Ready
💡 OPTICAL — Screen → Camera
Screen flickers TX data as light pulses at 30fps. Camera reads brightness changes and reconstructs bytes. Li-Fi principle. Zero radio.
Ready

THIS FILE IS THE APP

One HTML file. No install. No app store. No server.
Open it. It works. Copy it. It spreads.
In a crisis: USB → phone → spend BSV → done.

WAYS TO SPREAD WITH NO INTERNET
→ Download once. Copy to USB drive or SD card.
→ Bluetooth file share: Settings → share file → any phone
→ Local WiFi hotspot (no internet needed, just LAN)
→ NFC file share (Android Beam / Nearby Share)
→ QR code pointing to your download URL
→ Pre-load on old phones. Keep as emergency kit.
→ Print URL + QR + instructions on paper.

Every device that opens it becomes a relay node.
The network grows with every copy.
INSTALL AS OFFLINE APP (PWA)
Android Chrome: ⋮ Menu → Add to Home Screen
iPhone Safari: Share □↑ → Add to Home Screen
Desktop Chrome: Address bar install icon

Once installed: runs with airplane mode on permanently.
MINIMUM REQUIREMENTS
✓ Any phone or laptop (2012+)
✓ Chrome, Firefox, Safari, Edge — any version
✓ 0 MB data plan needed after first load
✓ Works without SIM card
✓ Works on Raspberry Pi, old Android, anything
! Bluetooth + NFC relay: Chrome Android/Desktop
✓ QR + Audio: works on absolutely every device
SHARE THIS APP
Scan to get CIRCATREZO
PRIVATE KEY
[ tap REVEAL ]
⚠ Write this down offline. No key = no BSV. No recovery. No company. No help.
IMPORT KEY
NEW WALLET
⚠ Replaces your current wallet. Back up key first.
NODE INFO
Protocol: CIRCATREZO/1.0
Chain: BSV Mainnet
Key: secp256k1 P2PKH compressed
Sighash: BIP143 SIGHASH_ALL|FORKID (0x41)
Broadcast: WhatsOnChain API
Operator profit: 0 SATS — always
Source: This file. Inspect it anytime.
TRANSACTION HISTORY
No transactions yet.
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