USB Data Blocker – Power-Only Adapter with Bitcoin Case

V1 Clearance Note

This current version works as intended. We are clearing remaining V1 stock to make room for an updated V2 design clearing remaining V1 stock to make room for an. If you want a simple USB power-only data blocker now, this is still a solid option.

Why you want a USB data blocker

Plugging a signing device into your laptop is always a trade-off. You need power, but you do not want to expose your wallet to whatever is running on that machine. This USB data blocker keeps things intentionally simple. It passes power only and physically disconnects the USB data lines, so your SeedSigner or other cold-wallet gear can stay offline while powering up.

Perfect for:

• SeedSigner and other DIY signing devices
• Cold wallets you only want powered, not connected
• Any USB device you would rather keep isolated from a questionable port

Key benefits:

• Power only, no data. Blocks USB data lines between host and device.
• Great for cold wallets. Safer power for SeedSigner and other signing tools.
• “Don’t trust, verify” design. Board ships outside the enclosure for inspection.
• Uses cables you already own. Works with standard USB-A leads.

How it works:

• Insert the data blocker between your computer or charger and your device.
• Plug your USB-A cable into the “Power Only” side.
• The board routes 5V power through, but the USB data pins are not connected.
• Your device powers on, but the host machine never sees it as a USB device.

Note: Because the board does not negotiate USB power, it may not work with some very “smart” chargers or power bricks that require data-line handshakes. In those cases, use a simple USB power brick, powered USB hub, or computer port.

Specs:

• Type: USB-A power-only data blocker
• Data lines: Not connected (no data passthrough)
• Recommended use: Standard 5V USB-A power sources
• Enclosure: 3D-printed Bitcoin case, removable for inspection
• Dimensions: 4.2 × 2.4 × 1.6 cm (approx. 1.65 × 0.94 × 0.63 in)
• Weight: 42 g (approx. 1.5 oz)

What’s included:

• 1 x USB data blocker board
• 1 x 3D-printed Bitcoin enclosure (top and bottom)

Suggested usage:

• Between laptop and SeedSigner (or similar signing tool)
• Between desktop and DIY cold-wallet gadgets
• Between unknown USB ports in airports, hotels, cars, and your devices