TLAY Product Architecture

11. Trust, Security, and Privacy

Machine commerce connects cyber systems to physical consequences. Security must therefore be designed across the entire lifecycle.

11.1 Device Identity and Key Protection#

Recommended controls include:

  • unique keys per machine;
  • hardware-backed key storage where available;
  • secure boot and signed firmware;
  • key rotation and revocation;
  • separation of identity keys and payment keys when appropriate;
  • recovery procedures controlled by the owner or fleet operator.

11.2 Policy Before Payment#

Every machine payment should be preceded by an explicit policy decision. The policy engine should evaluate:

  • counterparty identity;
  • requested service;
  • amount and cumulative exposure;
  • location and time;
  • service state and measured delivery;
  • anomaly and risk indicators;
  • whether human escalation is required.

The signed payment authorization should include sufficient context or references to prevent replay and misapplication.

11.3 Replay and Ordering Protection#

Machine events and payment messages should use combinations of:

  • unique nonces;
  • sequence numbers;
  • session identifiers;
  • expiration timestamps;
  • domain and chain identifiers;
  • previous-event hashes;
  • idempotency keys.

These controls prevent a valid message from being reused in the wrong session or accepted multiple times.

11.4 Privacy by Design#

Onchain commitments should reveal as little as possible. A production design may use:

  • hashes instead of raw records;
  • salted or keyed commitments for low-entropy data;
  • encryption of offchain event payloads;
  • tenant-separated access control;
  • selective disclosure;
  • zero-knowledge proofs for qualified claims where justified;
  • retention limits for operational data.

Public verification and data publication are not the same thing. TLAY’s architecture should make integrity public when useful while keeping sensitive content private.

11.5 Physical Oracle Risk#

The hardest problem is often not blockchain security but the truthfulness of the physical measurement. A secure architecture may combine:

  • calibrated sensors;
  • redundant measurement;
  • signed firmware and attestation;
  • independent counterparty readings;
  • anomaly detection;
  • periodic inspection;
  • economic penalties or insurance;
  • cryptographically linked audit trails.

HashAnchor preserves evidence. Deployment design determines how credible the evidence source is.

11.6 Compliance Boundary#

TLAY’s infrastructure can support regulated applications without presenting itself as a regulated bank. Responsibility depends on the deployment:

  • custody may be handled by an owner, wallet provider, or regulated custodian;
  • fiat conversion may be handled by licensed providers;
  • identity verification may be performed at owner or organization level;
  • transaction monitoring may be handled by the application or payment partner;
  • industry-specific compliance remains with the relevant operator.

Clear boundaries let TLAY remain infrastructure while enabling compliant solutions.