Elroy Heisterkamp first encountered Bitcoin in 2014, went through several cycles of large losses and recoveries, and in 2017 committed full-time to day-trading crypto. In 2018 he founded Het Crypto Huis, a Dutch crypto coaching and education business where he is listed as "Bedenker, Oprichter & T.A. Specialist" (founder and technical-analysis specialist). His public persona is built around the idea that he learned trading the hard way and now teaches what works versus what blows accounts up.

His main output channel is his YouTube — "Elroy Ryon — Crypto & Investeren" — where he posts near-daily chart analysis of large- and small-cap tokens. He also writes for Bitcoin Magazine NL (107+ articles) and Crypto Insiders, and gives interviews to Cryptonews.com and BeursInside. His Instagram handle is @ElroyRyon and the LinkedIn page for Het Crypto Huis is active.

For this directory he is a clear fit on the "active trader + verifiable public track record" axis — he is one of the few Dutch crypto figures who publicly self-identifies as a day-trader and has a multi-year daily TA archive on YouTube to back it up. The watch-out: he also sells coaching, so any feature must distinguish between his trading record and his education business — flag accordingly.