Roadmap / 4-Way Hybrid Ledger
IN RESEARCH
Roadmap · Architecture

From 2-Way to 4-Way
Hybrid Ledger

The Registry Ledger is being extended into a General Purpose Ledger, enabling Smart Contracts. This transforms XST's architecture from a dual-ledger system into a four-way hybrid — each layer purpose-built, each stateful where it matters.

Current Architecture
CURRENTLY LIVE — 2-WAY HYBRID
Now — 2-Way Hybrid
  • 01
    UTXO Bitcoin Ledger
    The blockchain — transaction history
  • 02
    Registry Ledger
    Block rewards & stealth addressing
Roadmap — 4-Way Hybrid
  • 01
    UTXO Bitcoin Ledger
    The blockchain — transaction history
  • 02
    Registry Ledger
    Block rewards & stealth addressing
  • 03
    Account Ledger
    Built on registry ledger technology
    NEW
  • 04
    Smart Contracts
    General Purpose Ledger layer
    NEW
4-Way Architecture Diagram
XST
GENERAL
PURPOSE
Ledger
Stateful Layers
Stateful
Ledgers 2, 3, and 4 maintain persistent state
📋
Registry Ledger
Persistent state for block rewards and name registry entries
💳
Account Ledger
Account balances with stateful persistence, built on proven registry tech
📜
Smart Contracts
Stateful contract execution enabling complex programmable logic
Smart Contracts — Design Considerations
Design Question
Can Smart Contracts be Feeless?
Smart contracts can have a feeless design based on Proof-of-Work — requiring the caller to perform memory-hard computation instead of paying a fee. This is actively being researched. The mechanism must be robust enough to prevent abuse while maintaining XST's signature zero-fee experience.
Likely Approach
Hybrid Fee Model for Contracts
It is more straightforward to have feeless token transfers but fee-based smart contract execution. A hybrid ledger design for smart contracts is the most likely path forward — preserving feeless micropayments while allowing contract execution to carry a small computational cost that prevents spam and abuse.
⚗️
Active Research
PoW-Based Feeless Smart Contract Execution
Stealth R&D is actively researching whether smart contract execution can be made feeless via a Proof-of-Work mechanism — where the caller burns compute cycles rather than paying fees. This would extend XST's feeless guarantee to the entire stack. Results are pending.
Development Timeline
Phase 1 — Shipped
2-Way Hybrid Ledger (UTXO + Registry)
The foundational dual-ledger architecture — blockchain UTXO layer fused with the Registry Ledger for block rewards and stealth address resolution.
UTXO Ledger Registry Ledger Feeless Transfers Stealth Addressing
Phase 2 — In Progress
General Purpose Ledger — Account Layer
Extending the Registry Ledger technology into a stateful Account Ledger. Enables account-based balance tracking alongside the existing UTXO model — laying the groundwork for smart contract state.
Account Ledger Stateful Accounts Registry Extension
Phase 3 — Upcoming
Smart Contract Layer
The fourth ledger — programmable, stateful, and extensible. Smart contracts deployed on XST will inherit the privacy and performance properties of the underlying chain. Fee model to be determined by ongoing PoW research.
Smart Contracts Programmable Logic PoW Feework (Research) Hybrid Fees (Fallback)
Phase 4 — Vision
Full Extensibility — 4-Way Hybrid Live
All four ledgers operational simultaneously. The XST network becomes a general-purpose private blockchain capable of supporting complex AI agent workflows, DeFi primitives, and programmable micropayments — all feeless at the transfer layer.
Full Extensibility AI Native Payments Smart Contract Economy
"The 4-way hybrid gives us a ton of extensibility. Each ledger is purpose-built — UTXO for transfer finality, Registry for rewards, Account for state, Smart Contracts for programmable logic. No compromises."
Stealth R&D LLC — Architecture Notes