Looks like DeepOnion mentioned in this audiobook
https://www.amazon.com/Bitcoin-Cryptocurrency-Trading-Investing-Candlestick/dp/B08VF8MG71?Adv-Srch-Books-Submit.x=19&Adv-Srch-Books-Submit.y=12&dchild=1&field-datemod=2&field-dateop=During&field-dateyear=2021&keywords=bitcoin&qid=1613903676&refinements=p_n_feature_browse-bin:1240885011,p_20:English&s=books&sr=1-8&unfiltered=1&linkCode=sl1&tag=craze2know04-20&linkId=42bfe5f027d628061e2d121e5c038b1d&language=en_US&ref_=as_li_ss_tl


DeepVault Certificate