Markus Breth

Reference project · demonstrator

Land registry, rebuilt.

A sovereign-grade demonstrator: property title and a rule-based, fully collateralized state currency (GBT) — together on one permissioned blockchain. Built from the recommendations of my master’s thesis.

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  • Hyperledger Besu · IBFT 2.0
  • chainId 20260
  • 33 modules live
  • 259 tests green

The problem

Property is slow, costly and opaque.

Land registers are digitized, but not programmable. Transfers take weeks, depend on intermediaries, and a property’s value can’t be mobilized directly.

  • 01Intermediary risk. Escrow, manual checks, broken handoffs between notary, bank and authority.
  • 02No programmable value. The asset secures nothing automatically — lending needs trust and time all over again.
  • 03Fiat without a hard anchor. Conventional money isn’t bound to real, audited collateral.
  • 04GDPR vs. blockchain. Immutable chains and a right to erasure are assumed to be incompatible.

The solution

One register. One currency. One source of truth.

The land register as a permissioned blockchain — with a rule-based, fully collateralized state currency (GBT) on top. Property and the value it unlocks live in the same auditable system.

A

Title on-chain

Each entry is an NFT. Transfer only via multi-sig of buyer + seller + notary — fraud protection by design.

B

Fully backed currency

GBT is minted only against pledged, appraised property. Repayment burns the debt — backing stays 1:1.

C

GDPR by design

3-layer data strategy: only hashes on-chain, plaintext erasable in the state database.

How it works

Modular to the core.

33 Solidity modules behind transparent proxies. They never call hardcoded addresses — only a central registry and a role manager; every module independently upgradeable, no network restart.

  • ▸AddressRegistry — one directory resolves every module address.
  • ▸RoleManager — notary, registrar, appraiser, issuer: each role enforced.
  • ▸IBFT 2.0 — 4 validators, instant finality, no mining.

Model B · The currency

Money that cannot exist beyond its backing.

01 — APPRAISAL

Appraisal

Accredited appraiser signs the value on-chain (AI oracle + human signature).

02 — PLEDGE

Pledge

The property enters the CollateralVault — the single minting authority.

03 — MINT

GBT is minted

At most 60 % of the audited value (LTV, governance-tunable).

04 — REPAYMENT

Burn

Repayment burns the debt GBT entirely and releases the collateral.

totalSupply(GBT) == Σ Darlehen ≤ LTV × Σ geprüfte Werte

This invariant is enforced on-chain and recomputed independently. No uncovered unit can ever exist.

Real registry law

Not a toy prototype — the whole register.

The full build mirrors Austria’s real procedure: every entry runs as a petition through the diary — filing → approval → legal force → execution. With genuine ranking and pending-marker logic.

Condominium / co-ownershipDiary & ranking§364cAnnotations & prohibitionsParcels (A-sheet)Building leaseSimultaneous mortgageReal burden · superstructurePre-emption / repurchaseProperty transfer tax

Condominium shares are DID-bound and non-fungible; the invariant Σ utility values == total is enforced in integers — no rounding leak.

Sovereign-grade security

Audited, recomputed, verified.

33/33
modules on-chain + verified in the explorer
259+
automated tests green (unit · E2E · compliance)
0
CRITICAL findings from the independent compliance station
3
data layers for GDPR-compliant erasure

Where we are

It runs. Today. Live.

No whitepaper, no pitch mockup. A working system on a 4-validator Besu network — verified against the live chain.

  • ✓All 33 modules live deployed & verified on-chain.
  • ✓Procedure as mandatory front door every write path runs through the diary.
  • ✓AI valuation oracle live draft €398,754 → appraiser signs €390,779 → 1.99 % auditable.
  • ✓4 front-ends + showcase authority, citizen wallet, investor, notary — non-custodial.
  • ✓Public registry API REST + GraphQL, role-based JWT.

From demonstrator to pilot

The next 18 months.

NOWdone

Complete, verified demonstrator

33 modules live, full build + currency, independently recomputed, 0 CRITICAL.

Q3–Q42026

Production hardening

AI oracle on its own account, governance handover to the state, external security audit.

H12027

Government pilot

A pilot district, real deeds via the 3-layer strategy, regulatory accompaniment.

H22027+

Scale

Rollout across states, then a second EU jurisdiction.

A partner for the first government pilot.

The demonstrator is built and proven. Happy to show it live. Self-audited — no external audit, no production use, not legal tender.

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