TX-SHIELD

TX-SHIELD builds modular privacy layers/solutions for institutional finance and AI systems:

TX-SHIELD – Institutional Privacy Infrastructure

TX-SHIELD develops regulated privacy-preserving infrastructure for institutional payments (TX-SHIELD), private AI collaboration (OpenTMP LLM), and MPC-TSS key management (Collab-Key). TX-SHIELD’s three core solutions — TX-SHIELD, OpenTMP LLM, and Collab-Key — address compliance, compute, and custody privacy challenges faced by regulated institutions.

Fits with patterns (names only)

TX-SHIELD:

  • pattern-private-stablecoin-shielded-payments
  • pattern-private-pvp-stablecoins-erc5753
  • pattern-regulatory-disclosure-keys-proofs
  • pattern-te-ex-settlement

OpenTMP LLM (adjacency):

  • pattern-adj-private-consortium-ledger
  • pattern-adj-delayed-post-trade-reporting

Collab-Key:

  • pattern-key-management-threshold-kms

Not a substitute for

TX-SHIELD:

  • ZK-based L2 privacy frameworks (e.g., Aztec, Scroll)
  • General-purpose MPC or TEE frameworks for secure computation (TX-SHIELD focuses on transactional privacy and compliance)
  • Traditional on-chain settlement systems without regulator access

OpenTMP LLM:

  • Centralized AI model training pipelines
  • Non-encrypted data-sharing frameworks

Collab-Key:

  • Single-key custodial wallets
  • Hardware-based key storage only

Architecture

TX-SHIELD

Implements a high performance MPC-based private payment layer with threshold key control and an audit-key protocol for regulator visibility.
Only sender, receiver i.e. stakers, and authorized regulators can access encrypted transaction details.
Optimized MPC execution enables high performance (~10k TPS).

OpenTMP LLM

Distributed AI architecture using federated learning and multi-party computation (MPC-FL) with threshold-secure aggregation.
Supports edge acceleration, model distillation, quantization, and joint model governance.

Collab-Key

Supports 2PC and multi-party ECDSA protocols, integrated with CrossBar EMPC + ReRAM hardware. Key shards are processed and stored within a ReRAM-backed secure element, ensuring private keys are never reconstructed in full at either the algorithmic or physical levels. Features an offline-by-default architecture with native FIDO2 support, integrating seamlessly with institutional KMS and APIs.

Privacy domains (if applicable)

  • Private Payments / Compliance Infrastructure
  • Collaborative AI / Federated Learning Privacy
  • ReRAM-backed Institutional Custody / Key Management

Enterprise demand and use cases

TX-SHIELD:

  • Institutional settlement for stablecoins, tokenized RWAs, and bonds on-chain.
  • Ideal for financial institutions needing confidentiality and compliance together.

OpenTMP LLM:

  • Privacy-preserving AI model training and inferences for enterprises and regulated sectors, such as healthcare, finance, and government.

Collab-Key: Institutional wallets, custodians, and enterprise-grade signing infrastructure requiring fault-tolerant, hardware-secure (ReRAM) key management to eliminate single points of failure.

Technical details

TX-SHIELD:

  • MPC-based encryption, threshold key control (TSS), high-throughput multi-party computation.

OpenTMP LLM:

  • MPC-FL, Distributed Learning, Edge AI Acceleration, SFT, RLHF.

Collab-Key:

  • MPC-TSS (ECDSA 2PC / multi-party), Threshold Signatures, Secure Key Generation.

Strengths

  • TX-SHIELD delivers institutional-grade transactional privacy with built-in regulatory visibility.
  • OpenTMP LLM enables privacy-preserving multi-party AI collaboration across edge and federated (hybrid on/off-chain) environments.
  • Collab-Key provides fault-tolerant, MPC-TSS-based signing with formal security foundations (USENIX Security 2025), strengthened by CrossBar ReRAM hardware-level isolation to eliminate physical-layer vulnerabilities.

Risks and open questions

TX-SHIELD:

  • Governance over regulator audit keys
  • Integration complexity across different blockchain environments

OpenTMP LLM:

  • Coordination complexity in multi-party settings
  • Trade-offs between model performance and full encryption overhead

Collab-Key:

  • Performance scaling with increased party count
  • Implementation complexity across heterogeneous custody systems
  • Challenges in standardizing the interface between the ReRAM-backed secure element and diverse institutional legacy KMS/custody environments.
  • Establishing protocols for secure shard migration or recovery in the event of physical hardware failure or decommissioning of the CrossBar EMPC module.

Links

Official Website: TX-SHIELD | BenPay|Privacy Wallet

Contact: ZYX Research | haiyangxue@smu.edu.sg

Papers: