What this page covers
Residency evidence should show what moved, where it was processed, who accessed it and which proof remained after the event.
Evidence question
EU data residency proof evidence library answers a concrete audit question: what must be retained so a third party can verify the relevant event chain later?
- Which event happened and which system produced it.
- Which policy, model, supplier or human approval was active.
- Which hash, signature, Merkle root and verifier receipt prove integrity.
Attesto proof layer
Attesto complements GRC, SIEM, storage and workflow systems by sealing selected evidence records instead of replacing the operating system.
- Raw data can remain encrypted or customer-controlled.
- Proof material can be shared with auditors or customers.
- A verifier can test whether a record still matches the anchored root.
Legal timing
NIS2 was due for national transposition by 17 October 2024. National implementation differs by Member State, but incident and control evidence should be retained before an authority or customer asks for it.
This page is implementation guidance for evidence planning, not legal advice.
Evidence Attesto AI can preserve
API event
access event
supplier attestation
public anchor reference
auditor verification receipt
Example evidence records
Example proof receipt
Example Attesto receipt
event_type
EU_DATA_RESIDENCY
timestamp
2026-06-04T10:21:00Z
leaf_hash
sha256:8f41...b19e
merkle_root
sha256:52ac...91d4
anchor_reference
attesto:anchor:2026-06-04:eu-001
verification_status
valid demo receipt, raw data not exposed
Where Attesto fits
Attesto helps customers verify residency claims without publishing raw data or depending only on supplier statements.
FAQ
How is this different from a normal log?
A normal log asks an auditor to trust the system that produced it. Attesto records hashes, signatures, Merkle proofs and verifier receipts so selected evidence can be checked independently.
Does Attesto need to expose raw sensitive data?
No. Raw records can remain encrypted or customer-controlled while proof material is shared for verification.
Where does EU data residency proof evidence library fit in the compliance stack?
Attesto helps customers verify residency claims without publishing raw data or depending only on supplier statements.