About EVstring
Every product, a verifiable story: from production to second life to recycling.
We are building the shared record that a circular economy needs: one trustworthy, portable, lifelong digital identity for every product, which every company in the chain can read and write, and none can rewrite. We started with EV batteries.
Why we exist
Batteries outlive the systems that track them.
An EV battery is made in one country, installed in another, serviced by independent workshops, sold with a used vehicle, repurposed for energy storage and finally recycled, often over fifteen years or more. Each hand-off happens between companies that do not share systems, and each one loses information.
The consequences are real: second-life buyers cannot trust health claims, recyclers receive packs with no composition data, and regulators cannot see where batteries end up. Regulation is now catching up, led by the EU's battery passport requirement from February 2027.
EVstring's answer is a shared passport where the data stays with the companies entitled to it, and the proof that it has not been altered is held on a ledger that no single participant controls, including us.
Principles
What we will not compromise on.
Verifiable, not claimed
Private by design
Open standards
Honest scope
Where we are
A working platform, ready for pilots.
EVstring is at an early stage. Passports, lifecycles, documents, credentials and analytics work today for five product types; the next capabilities are built in the order pilots need them.
Smart contracts
AvailableSeven contracts: participants, a registry of product types, passports, a generic lifecycle, documents, records and telemetry.
Platform core
AvailableAPI, transaction queue and chain indexer, with full lifecycles exercised end to end.
Web dashboards & public passport
AvailableRole-based dashboards for every organisation type and the QR-linked public passport page.
Documents, telemetry & carbon
AvailableEncrypted documents with on-chain integrity checks, Merkle-anchored telemetry, and carbon and recycled-content declarations.
Verifiable credentials
AvailableOrganisation identities (DIDs) and W3C credentials, such as the recycling licence that gates closing a passport.
Beyond batteries
AvailableOne engine for any product with a battery-like lifecycle: EV chargers, solar panels, electronics and textiles ship as templates.
Platform owner panel
AvailableOrganisations, product types, credentials and a dashboard of the network’s impact on traceability and circularity.
Hosted pilot environment
AvailableContainerised deployment with its own permissioned chain, backups and automatic rollback.
Field app
In developmentAndroid app for workshops, installers and recyclers; store release in preparation.
Consortium network
RoadmapValidator nodes run by consortium members, a public block explorer, hardened key custody and independent audits.
Looking for pilot partners across the value chain.
We are especially interested in working with manufacturers preparing for the EU passport, fleets and second-life operators who need credible health data, and recyclers who want to evidence recovery. Pilots shape the roadmap directly.
Beyond batteries
AvailableOne trust layer for every regulated product.
The EU's Ecodesign for Sustainable Products Regulation extends the digital product passport idea well beyond batteries. In EVstring each product type is a versioned definition (fields, lifecycle, who may do what, documents, recovery records) that the smart contracts enforce. The prototype ships five templates; more types are added as data, not code.
- EV batteries
- EV chargers
- Solar panels
- Consumer electronics
- Textiles & apparel
Curious how the integrity guarantees work? Read how it works.
Get started
See a battery passport end to end.
We will walk you through registration, lifecycle events, the public QR passport and tamper-evident verification, using your own battery categories as the example.