Use case
Provable External Collaboration
Work with counterparties, regulators and partners across borders — with verified identities and a record designed to stand up to evidentiary scrutiny.
What it is
Collaboration with external counterparties — clients, co-counsel, auditors, partners — where every participant holds a verified PostNumber identity and every delivery is timestamped and tamper-evident. Designed with eIDAS 2.0 and qualified electronic registered delivery in mind; qualified-service status is part of our roadmap, not a current certification.
Why cross-organisation work belongs in Letro
Verified on both sides
Every participant holds a PostNumber issued after identity verification, in any jurisdiction.
A record built for evidence
Sending, delivery and receipt are timestamped in a tamper-evident chain, retained for 10 years and exportable on demand.
Federated, not centralised
On Matrix, approved organisations can communicate across their own homeservers without collapsing into one vendor-controlled tenant.
Designed with eIDAS 2.0 in mind
Letro's evidence model is designed to support the requirements of qualified electronic registered delivery (QERDS). Qualified-service status is part of our roadmap, not a current certification.
How provable collaboration works in Letro
Verify, exchange, and keep the evidence.
01
Verify the counterparty
External parties join with their own PostNumber; you see a verified identity, not just an email address.
02
Exchange inside a shared Dossier
Documents and messages travel encrypted between the organisations' homeservers.
03
Record every event
Each send, delivery and acknowledgement is timestamped and chained.
04
Export when required
Produce the record for supervisors, auditors or courts in a verifiable form.
Discuss Your Deployment Model
Whether you need a standard rollout, private infrastructure, or stricter residency and isolation requirements, Letro gives you a trustless foundation for secure client communication.
