PowerVerify Coupler

You shouldn’t have to trust your charger. You should be able to prove it.

Public USB ports and unknown cables can move data, not just power — the reason the FBI and FCC have both warned travelers about “juice jacking,” and why the FCC’s guidance is to use a charging-only cable from a trusted supplier.

Here’s the problem with most “data blockers”: they ask you to trust that the data path is switched off. Software can be wrong. Switches can fail. You can’t see any of it.

PowerVerify doesn’t switch the data lines off. They’re not there. As the device itself says: When physics is policy, trust is optional.

Don’t trust it. Verify it.

See it. Look straight through the clear, cast resin. No data traces, no chips, no firmware — three parts: a surge protector at each port and one bulk capacitor on VBUS, every one named on the board (SURGE PROTECT, SURGE PROTECT, VBUS BULK). Both receptacles are six-contact power-only USB-C parts: VBUS, ground, CC1 and CC2. There is no D+ or D− contact to be unwired — the metal is not there. The board says it in silkscreen: DATA ABSENT.

Prove it won’t talk. Put the coupler between your cable and the port: a computer on one side, your phone on the other. Your phone charges — and never appears as a USB device. No notification, nothing in Device Manager, nothing in System Information. It can’t enumerate, because there’s no data path to enumerate over. This takes thirty seconds and it doesn’t require believing a word we’ve said.

Look it up. Every unit carries a verification code — printed on the label sealed inside the resin. Enter the code at verifyknot.io to pull the manufacturing record for the specific unit in your hand.

Power flows over VBUS and GND. CC1 and CC2 pass straight through from one receptacle to the other, so your charger and your device negotiate voltage with each other — there is no controller in between, and either end can be the source. The D+/D− data contacts do not exist in either receptacle. Your charger can’t reach your device — not because the path is disabled, but because it was never built.

Every claim is printed on the object, permanently

We can revise this page. We can’t revise the board. So the construction is written on it, in silkscreen, where it can’t be quietly walked back: PowerVerify™ · DATA ABSENT, and the name of every part beside it. On the reverse, under the pot: the sealed label with the unit’s verification code and POWER ONLY · DATA LINES PHYSICALLY ABSENT, and ZKNOT.IO. If we ever overstated this product, the evidence would be cast in resin in a customer’s hand.

Built as evidence, not as an accessory

Every PowerVerify is a serialized object with a build record, not an anonymous adapter:

• It’s sealed in a single solid pour of clear resin — no seams, no screws, no shell to pop open. To reach the board you’d have to destroy the unit, and the embedded label goes with it.
• A serial and verification code link the unit to its registered manufacturing record at verifyknot.io.
• It’s hand-built in small batches — placed, reflowed, potted, cured, then wet-sanded through 3000 grit and polished. The finish isn’t decoration. A pot you can’t see through can’t be inspected, and inspection is the entire product.

Straight talk about what that record is

We sell honest proof, so here is precisely what the record does and doesn’t do.

What it is: ZKNOT’s signed statement that we built this specific unit, and when. A birth certificate, signed at our bench with our provisioning key. A provenance trail you can look up instead of taking on faith.

What it is not: it is not a claim made by the coupler. This unit is passive — no microcontroller, no secure element, no key. It signs nothing, at the bench or in the field, and it cannot record or attest a charging session because it has nothing to record with.

And it is not an independent third party vouching for us. That signature is ours. It proves the record hasn’t changed since we filed it. It does not prove we’re honest — nothing signed by us ever could. What it does is make our claim specific, dated, and checkable, so that if we ever lied about a unit, the lie would be a fixed target instead of a vague impression.

That’s the standard we hold everything here to. We’ll always tell you exactly what a claim is and what it isn’t.

Specifications

• Inline coupler: USB-C receptacle ↔ USB-C receptacle. Your cable goes in one end, the device’s cable in the other
• Both receptacles are six-contact power-only parts (VBUS, GND, CC1, CC2) — no data contacts exist
• 5–20V DC, 60W max (20V / 3A) — CC passes straight through, so your charger and device negotiate USB-C Power Delivery with each other; the connector’s 3 A rating is the limit
• Surge protection (TVS diode) at each port; VBUS bulk capacitor
• Fully passive — no microcontroller, no secure element, no firmware, no software
• Solid clear-resin potting — no seams or screws, full visual verification
• Serialized; manufacturing record registered at verifyknot.io
• Designed and hand-assembled in Utah · veteran-owned (SDVOSB)

What it deliberately does NOT have

• No data lines. D+/D− contacts are physically absent from both receptacles and there are no data traces on the board. USB enumeration is impossible.
• No chips. No firmware. No software. It’s a passive coupler. Nothing to update, exploit, or phone home.
• No cloud dependency. It works offline, the same way, forever.
• No battery, and nothing to wear out but the two receptacles themselves.

Who it’s for

Travelers charging in airports, hotels, and cafés · journalists and researchers handling sensitive devices · attorneys and investigators handling digital evidence · security teams who buy on evidence rather than datasheets · anyone who saw an FBI or FCC warning about public USB ports and wanted proof instead of a promise.

Who it’s not for

If you just need a charge-only adapter at home, a $5 blocker is fine. PowerVerify is for people who need to verify, not trust — and to hand someone else the means to verify too.