Can you open https://signal.org/docs/specifications/doubleratchet from mainland China?
No.
No recent testsVerdict from 2026-03-22 · 5 mo ago
As of the last test on 2026-03-22 — 5 mo ago — it was blocked in mainland China. We haven't tested it since, so this may have changed.
Access signal.org with GreatFireVPN →Frequently asked questions
Is https://signal.org/docs/specifications/doubleratchet blocked in mainland China right now?
We haven't tested https://signal.org/docs/specifications/doubleratchet in the last 90 days. As of the last test on 2026-03-22 (5 mo ago), it was blocked in mainland China. Use the Test now button on this page for a fresh measurement.
Why is https://signal.org/docs/specifications/doubleratchet blocked in mainland China?
As of the last test on 2026-03-22 — 5 mo ago — it was blocked in mainland China. We haven't tested it since, so this may have changed.
Since when has https://signal.org/docs/specifications/doubleratchet been blocked?
GreatFire has recorded interference with https://signal.org/docs/specifications/doubleratchet from mainland China since 2025-04-08.
How can I access https://signal.org/docs/specifications/doubleratchet from mainland China?
You need a circumvention tool such as a VPN. GreatFireVPN, built by GreatFire, is designed to bypass the Great Firewall and reach sites like signal.org.
https://signal.org/docs/specifications/doubleratchet · JSON