Quick answers
Did William Hua co-found Horizon Blockchain Games, now Sequence?
Yes. Horizon's own team page (horizon.io/about, Wayback capture 2023-12-07) listed five co-founders with titles: Peter Kieltyka "Co-founder + CEO", Ian Ha "Co-founder + Head of Operations", William Hua "Co-founder + Chief Scientist", Daniel Racca "Co-founder + Head of Design" and Michael Sanders "Co-founder + Chief Storyteller". The same listing was still up in the 2024-12-03 capture. Metaverse Post (2023-06-21) names the same five founders.
What did William Hua do at Horizon?
He was chief scientist. Horizon's team page bio (horizon.io/about, Wayback capture 2023-12-07) said he worked on "critical components of Horizon’s innovative architecture", was formerly part of "Canonical/Ubuntu’s Desktop Team", helped develop the theScore mobile app, and had "three years’ experience as a PhD mathematical researcher in computational geometry and mathematical optimization." His current title could not be checked: Sequence's own site has no team page (read 2026-10-27).
What happened to Sequence?
On 2026-01-13 BetaKit reported that Toronto-based Sequence "has been acquired by blockchain payments platform Polygon Labs", and The Logic (2026-01-14) reported Polygon Labs paid US$250 million for Sequence and Seattle's Coinme combined. BetaKit says the company was "Founded in 2017 as a blockchain gaming startup called Horizon". As of 2026-10-27, sequence.xyz still carries the banner "Polygon Labs is acquiring Sequence to power the Open Money Stack.", so this directory has not confirmed a closing date. Whether Hua moved to Polygon Labs is not confirmed.
Has William Hua spoken at TechTO?
No. The company's TechTO connection is co-founder Ian Ha, who sat on the TechTO panel "What is Holding Web3 Back?" on 2023-03-22. No interview or podcast with Hua that this directory can link was found (searches run 2026-10-27).