Create your own battery passport
and anchor it on Midnight.

From February 2027 the EU Battery Regulation requires a digital passport for every EV, industrial and light-transport battery sold in Europe: public, verifiable data without exposing competitive secrets. Exactly what you get to try here, live on a real Midnight testnet:

dust-sponsored fees salted field tree, nothing guessable batched circuit calls, one tx zero-knowledge proofs, values hidden list membership, entry hidden

In about five minutes you will create a small battery passport, anchor it on the Midnight blockchain and prove up to five confidential claims about it, without revealing a single number.

9

fields per passport, 4 of them optional confidential values you can make claims about

3

on-chain transactions per passport: the fingerprint, one batch for id binding + field root, one batch for every proof

5

kinds of confidential claims: CO2, capacity, cycle life and recycled content each stay within a public bound, and the cell chemistry is shown to be on a public list without saying which one. All proven together in one transaction

Nothing readable goes on-chain, only a fingerprint.
Your fields live in a salted Merkle tree; only its root is anchored.
A proof publishes the statement, never the value.
Your key stays here; the hosted sponsor pays the fees.

Your producer identity

NIGHT address

Your passport is issued and anchored under this identity.

Your battery passport

Model name Manufacturer Weight (kg) Performance class Public, shown on the explorer next to model and weight. Carbon footprint (kg CO2e) confidential Never published, never on-chain in clear. Only a proof about it. Prove publicly: CO2 is at most (kg CO2e) The claim everyone can verify, without learning the real value.

Prove more, in the same transaction

Each extra claim adds another confidential value to your passport and one more public statement about it. They are proven together in ONE transaction, so any number of claims costs one wait and one fee.

Anchoring your passport

Passport ID

Freshly generated for you. The bind step anchors the blake2b-256 hash of exactly this id on-chain, and the explorer will list your passport under it.

This runs live on a Midnight testnet. Every tx link opens a real on-chain transaction; the fingerprint goes first, passport binding and field root share one batch, and all your proofs share another.

Done. Your passport is on-chain.

Your confidential values never left the server. What is on-chain is the passport's anchor and one zero-knowledge proof per statement above, verifiable by anyone.

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