Monero (XMR)
A means of exchange focused on total confidentiality, it guarantees untraceable transactions like digital cash. Secured by Proof of Work (PoW) on a conventional computer, the US tax authorities offered $620,000 to anyone who succeeded in breaking its encryption, without success.
Its strength lies in its complete anonymity, unlike the digital euro, which will be highly monitored. Although banking and government systems disparage it because they fear it, attacks against Monero have greatly strengthened it.
Its price was relatively stable from 2022 to 2025 compared to Bitcoin's rise.