Cryptographic audit infrastructure for UK law firms. Immutable compliance trails with GDPR-compliant erasure.
The problem
Maintain tamper-evident, immutable records of all client account activity. Any gap in the audit trail is a disciplinary matter.
On request, permanently erase all personal data relating to the data subject. The right to erasure is absolute.
These two mandates are structurally incompatible. Today, most firms run two separate systems with a compliance officer reconciling between them. It's expensive, fragile, and exposes the firm to both regulators simultaneously.
The solution
Every record gets its own key.
Each compliance event is encrypted with a unique AES-256 key. The SHA-256 hash is computed over the encrypted payload and chained to every previous event. Tamper with one record and the entire chain breaks.
Delete the data by destroying the key.
On a GDPR erasure request, the encryption key is permanently destroyed. The data becomes mathematically unrecoverable. A destruction certificate is generated as regulatory evidence.
The audit trail stays intact.
Because hashes were computed over encrypted payloads, the chain is unbroken. Your SRA audit passes. Your GDPR obligation is met. Both regulators satisfied, simultaneously.
How it works
Connect your practice management system
Nexum integrates with Clio, LEAP, and Osprey. Client account activity and case events flow into the audit ledger automatically.
Every event is sealed cryptographically
Encrypted, hash-chained, and periodically anchored to Bitcoin via OpenTimestamps. Independently verifiable by any auditor.
Erasure without breaking the chain
When a data subject requests deletion, the encryption key is destroyed. Data gone. Proof preserved. Both regulators satisfied.
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