OpenLine Technical Lineage: A Source-Backed Chronology of Agent Evidence, Receiver-Side Decisions, and Portable Owner Authority (2025–2026)

This source-backed technical history traces OpenLine from its September 2025 typed AI-agent wire and schema-validated JSON receipts through the 2026 emergence of receiver-signed authorization decisions, one-use final execution gating, a portable owner-controlled authority Wallet, and a bounded live Claude-to-Codex host-switch experiment. Each dated milestone is classified as described, implemented, or demonstrated and linked to contemporaneous public posts, Git revisions, and experiment evidence. UCAN's earlier delegation, invocation and execution receipts, Biscuit, macaroons, OAuth, transparency work, and Google's concurrent AP2 release are acknowledged as material prior art. The record documents an independent architectural development trajectory without claiming the invention of cryptography or a categorical first, universal agent interchangeability, independent multi-party deployment, unique security advantage, or commercial adoption.