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This document compiles the most important documents covering the Horizon upgrade for the Council’s quick reference.

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Overview of the Horizon Upgrade

High-Level Overview of the Horizon Upgrade

GIPs

• GIP-0066: Introducing Graph Horizon - https://github.com/tmigone/graph-improvement-proposals/blob/tmigone/horizon/gips/0066-graph-horizon.md
• GIP-0068: Subgraph Service - https://github.com/tmigone/graph-improvement-proposals/blob/tmigone/horizon/gips/0068-subgraph-service.md
• GIP-0085: Horizon Arbitration charter - https://github.com/tmigone/graph-improvement-proposals/blob/tmigone/horizon/gips/0085-horizon-arbitration-charter.md

Technical specifications

Graph Horizon technical specification v2.2

Subgraph Service technical specification v1.1

Implementation: smart contracts

• PR: https://github.com/graphprotocol/contracts/pull/944
• Audits:
  • June 2024 - OpenZeppelin: Horizon audit 1
  • November 2024 - Trust Security: Horizon Upgrade
  • May 2025 - OpenZeppelin: Horizon audit 2
  • June 2025 - OpenZeppelin: missed issues

Upgrade documentation

Graph Horizon: deployment plan (Template)

Graph Horizon: test plan

Graph Horizon: state migration

Graph Horizon: upgrade guides