Virtual Identity (VI)
A Virtual Identity (VI) is a cryptographically derived, temporary identity generated from
trusted system attributes — such as device hardware IDs, OS attestation, secure-enclave keys,
SIM/TPM credentials, or verified biometric or account factors.
Each VI is derived inside a secure environment (for example, a Trusted Execution
Environment or TPM) so that raw personal identifiers never leave the device.
It acts as a verifiable identity card for one lawful purpose or session only.
Because it’s ephemeral and purpose-scoped, a VI cannot be reused or correlated across
services.
If a session ends or consent expires, the VI self-invalidates.
Example:
A VI-Login is created when a user signs in.
A separate VI-Payment is derived from a hardware key when performing a
transaction.
A VI-Support is issued for a customer-service chat.
Each is mathematically distinct but traceable under lawful audit.
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Multi-VI
A Multi-VI is a hierarchical or federated set of Virtual Identities derived from a single parent
trust root — such as a citizen’s e-ID certificate, a device root key, or an enterprise trust
anchor.
Each child VI is independently scoped (different purpose, jurisdiction, or application) but
cryptographically linked to its parent through a signed derivation chain.
This design provides continuity without correlation: all child VIs can be verified as legitimate
descendants of a known trust root, yet none can expose or link the others’ data.
Example — Citizen’s National Root VI
1. Root VI (VI-Root-Citizen)
o Derived from national e-ID or hardware enclave key.
o Stored only in secure enclave; never leaves the device.
2. Child VIs:
o VI-Banking-EU: used only for financial transactions; CJT = “EU-GDPR /
payment_processing / 30-min expiry.”
o VI-Health-EU: used for health portals; CJT = “EU-Health-Data-Act /
medical_records / 24-h expiry.”
o VI-Telecom-EU: used for telecom authentication; CJT =
“network_provisioning / 1-year validity.”
3. Each child VI signs its own flows, but all contain a reference hash of the parent root
so regulators can verify authenticity without revealing the citizen’s base identity.
If the health-VI is compromised, regulators can revoke it while banking and telecom VIs
remain valid.
The citizen’s root trust key never changes — it simply spawns a new sub-VI with a new CJT.
In one line:
A Single VI is a one-time, purpose-bound digital passport; a Multi-VI is a family of such
passports issued under a single sovereign root, enabling many lawful digital identities to exist
in parallel — isolated for privacy, yet verifiably authentic under one trusted origin.
Hardware / Software Attestation
Challenge:
The entire system depends on the Virtual Identity (VI) being a trustworthy, enclave-minted credential. If
the secure element (TEE/TPM/Secure Enclave) is compromised, the entire privacy and compliance
chain could theoretically break.
Solution — Layered Trust Architecture:
The system does not rely on a single perfect hardware chip. Instead, it establishes multi-layer
attestation and redundancy, so that even if one layer fails, privacy and compliance remain intact.
1. Device-Level Attestation for VI Minting
o A VI is minted only inside a verified TEE, Secure Enclave, TPM, or Hardware Security
Module (HSM).
o Existing attestation frameworks (e.g., TPM Attestation, Android SafetyNet / Play
Integrity, Apple DeviceCheck, WebAuthn) are reused to prove device and app integrity.
o Validators reject any VI issued from a non-attested or tampered device.
2. Platform / Origin Binding
o Each VI is cryptographically bound to the originating platform, app, or domain.
o Even if a secure element is cloned, the VI will fail verification outside its original
platform context—rendering it useless to attackers.
3. Dual-Signature Compliance Tokens (CJTs)
o Every CJT carries dual signatures (classical + post-quantum) and has a short time-to-live
(TTL).
o If any TEE class or device family is compromised, a rapid class-wide revocation disables
misuse within seconds.
4. OS-Level Enforcement
o At the kernel or keystore level, only attested processes can read or write identifier APIs.
o Non-attested apps cannot mint, export, or use VI–CJT pairs.
5. Server / Edge Validation (Redundant Firewall)
o Even if a client device is rooted or tampered with, edge servers and network gateways re-
validate every VI–CJT before accepting a transaction.
o Spoofed or replayed identifiers are rejected in real-time (< 5 ms).
6. Developer and App-Store Attestation
o CJTs are issued only to verified developer identities, and app integrity must be attested at
install time.
o VIs are ephemeral, preventing any persistent identifier leakage.
7. Immutable Ledger Anchoring
o All issuance, validation, revocation, and expiry events are recorded on an immutable
compliance ledger.
o This provides regulators with tamper-proof audit trails and enables fast class-revocation
if a security breach occurs.
8. Hardware-Agnostic Design
o The framework accepts any modern secure root (TPM 2.0, TrustZone, Secure Enclave, or
Cloud HSM) as long as it produces verifiable attestation evidence.
o Implementation is incremental — browsers, OS vendors, and edge providers can
integrate gradually using standard APIs.
9. Phased Deployment Model
o Phase 1: Server-side CJT validation (no hardware dependency).
o Phase 2: Secure enclave–based VI minting.
o Phase 3: Full hardware-software co-attestation with regulator-mirrored ledger anchoring.
10. Outcome
This layered model ensures that:
A single compromised chip cannot break compliance.
Privacy and lawful-use enforcement continue at network and ledger layers.
Regulators gain verifiable, cryptographically sealed evidence of device and process integrity.
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Lost / Destroyed Device Scenario — Ledger-Based Traceability
Question:
If a person throws away, loses, or destroys their mobile device that contained the Virtual Identity (VI),
how can the system still identify or trace them if required (e.g., by court order or regulator)?
Answer — Cryptographic Chain of Accountability
1. VI ≠ Device — It Is a Ledger-Anchored Identity Card
The Virtual Identity minted within a phone’s secure enclave is not tied to the hardware itself.
Each VI creation event (hash, attestation, CJT linkage, timestamp, and issuer signature) is
anchored to a regulator-mirrored compliance ledger.
Even if the phone is destroyed, the VI’s attested footprint remains immutable and auditable
across ledgers — similar to how a bank can verify a revoked card after it’s destroyed.
2. Court-Authorized Re-Linking (Lawful Unmasking)
When lawfully required (e.g., fraud, national-security investigation), the ledger record identifies
the issuing network, SIM/KYC source, or platform authority.
Regulators can re-link that VI chain to its lawful origin (telecom, bank, or government KYC
system) under dual-signature authorization — regulator + judicial authority.
Every such unmasking is recorded as a Ledger-Anchored Validation Receipt (LAVR),
maintaining transparency and privacy protection simultaneously.
3. Federated Backup of Compliance Tokens (CJTs)
CJTs are multi-hosted across mirrored regulatory or certified ledgers — not stored solely on the
device.
When a user registers a new phone, the system derives a new VI–CJT pair from the old ledger
chain, establishing cryptographic continuity without revealing personal data.
Prevents impersonation or “identity resets” while ensuring lawful continuity.
4. Automatic Revocation of Lost Device Credentials
Once a device is reported missing, its attestation certificate or device key is blacklisted.
All flows attempting to use that VI–CJT pair fail at validation points (OS, gateway, or edge),
exactly as a revoked payment token fails authorization.
Network-wide propagation occurs within seconds via short-TTL token caches (≤ 2 s
convergence; see feasibility benchmarks).
5. Emergency Override Tokens
In critical cases (AML/FATF, counter-terrorism, or public-safety emergencies), an Emergency
Override Token can be broadcast to quarantine or revoke all flows linked to a missing device.
Every override action is itself ledger-recorded and auditable for abuse prevention.
6. Privacy with Accountability
Destroying a phone does not erase its compliance footprint: all actions remain sealed and
regulator-verifiable.
Yet personal data stays pseudonymized unless lawful unmasking is triggered.
Thus, the system achieves both non-repudiation for investigators and privacy protection for
citizens.
Summary
Even if a user discards or destroys their phone, the system remains privacy-preserving for honest
users and traceable for lawful investigations.
The device can vanish — but its auditable compliance ledger trail cannot.