KXCO Nexus

Identity, legal execution & proof.

Establish who someone — or something — is, sign things that hold up, and let anyone check it for themselves.

Nexus is the layer that answers who is this, who is allowed to act, and is this genuine — for people, institutions and AI agents, in a form both humans and machines can verify without trusting a middleman.

Open KXCO Sign → Request a briefing →
Live ML-DSA-65 · NIST FIPS 204 Anchored on Armature L1
Identity Authority Signature Audit log Proof Record
The Problem

Trust is scattered across vendors — and none of it is quantum-safe.

Today, identity, signing, verification and document custody each live in a different tool, with a different login and a different definition of who you are. There is no shared trust model underneath them — so proving a signature, a credential or a chain of authority means trusting whichever vendor happened to record it, and hoping it's still around when the proof is needed.

Worse, the cryptography holding all of it together is the cryptography quantum computers are expected to break. A signature that's valid today can be forged retroactively once that capability exists — and adversaries are archiving signed documents now to do exactly that.

Machines make this untenable. A person can phone a bank to confirm a signature. An AI agent cannot — it needs identity, authority and proof it can check itself, structured and cryptographic, the same answer every other system will also verify.

Why It Matters

Built for the age of AI and quantum.

Quantum
Proof that outlives the algorithm
Every credential and signature uses ML-DSA-65 (NIST FIPS 204), so it stays valid after the deadlines that will retire today's cryptography — NIST published FIPS 203 and 204 in August 2024; new ECC/RSA procurement is restricted from 2026; RSA-2048 and ECC-256 are deprecated across US federal infrastructure by 2030; and CNSS Policy 15 requires full migration by 2035.
AI
Credentials for agents
Give an AI agent a scoped credential and it signs its own actions with its own key — every action tracing back to a human-accountable root identity. Authority is explicit, bounded, and can be revoked instantly and in isolation without disturbing anything else. Identity and permission only — never a black box acting on nobody's behalf.
Blockchain
A permanent, public anchor
Every seal and credential event is anchored on Armature L1 — a permanent, independently verifiable record. Any counterparty, regulator or court can confirm a document existed, unaltered, at a point in time, with no KXCO account, no fee, and no dependency on KXCO continuing to operate.
The Tech

A hierarchy of trust, verifiable offline.

From an institution's root key to every credential, signature and audit entry it produces — verifiable without a network call or vendor dependency.

01
Root identity
The institution holds an ML-DSA-65 root key in its HSM. It never leaves the hardware. Every credential traces back to it.
02
KYC-gated credential issuance
After a user passes KYC, the institution issues a credential encoding role, authority, jurisdiction and expiry — a signed, logged institutional act.
03
Credentialed signing
The user — or an authorised agent — signs documents and transactions, producing a portable, self-contained ML-DSA-65 envelope tied to their credential.
04
Offline counterparty verification
Any counterparty verifies the full chain — signature to credential to root — with no API, no vendor server, and no SLA dependency.
05
Tamper-evident audit log
Every issuance, signing, rotation and revocation appends to a hash-chained, signed log. Nothing can be altered or reordered without detection.
2024
NIST publishes FIPS 203 and 204. The standards are final. Migration begins.
2026
NSA mandates PQC for all new US national security systems. ECC and RSA forbidden for classified government procurement from this point.
2030
NIST deadline to deprecate RSA-2048 and ECC-256 across US federal infrastructure.
2035
NSA CNSS Policy 15: full migration of all classified systems without exception.
Capabilities

What you can do with Nexus.

Each capability is live in KXCO Sign. Use one, or use them together.

Identity
Institutional identity, verifiable by anyone
A hierarchy of trust from an institution's root key to every credential it issues — a permanent ID for people, businesses and AI that anyone can check, without a central database to hack or switch off.
Explore identity →
Signatures
Quantum-secure e-signatures
Quantum-resistant signatures on every document — ML-DSA-65 (FIPS 204) — with on-chain attestation, public verification, templates, multi-party signing, voiding and expiry. Legally binding under ESIGN and eIDAS.
Open Sign →
Data Rooms
Private rooms with a provable trail
Private, view-only rooms — no downloads. Invitees sign a PQC-attested confidentiality undertaking before viewing, every open is timestamped, and the audit trail is anchored on-chain.
Explore data rooms →
Verification
Prove it's what it claims to be
A KXCO Verified seal is an ML-DSA-65 signature anchored on Armature L1 — binding a domain, a document's hash, or an article to its author and publication. Precise by design: clear about what it proves.
See verification →
Who It's For

Anywhere the proof has to last.

Nexus serves anyone who needs identity and execution that hold up to scrutiny — today and after the cryptographic deadlines.

Banks & custodians Law firms Hedge funds Regulated institutions Businesses signing contracts Publishers & authors AI agents acting under authority

Put a trust model under everything you sign.

Start in KXCO Sign, or talk to us about deploying Nexus identity and signing for an institution.

Open KXCO Sign →Request a demo →