Monero

Monero (XMR) is the world's most adopted privacy cryptocurrency, launched in April 2014. By default it encrypts the sender, the receiver and the amount of every transaction through ring signatures, stealth addresses and RingCT. It runs on Proof of Work with the RandomX algorithm optimized for ASIC resistance, keeping mining accessible for home hardware.

Both are privacy coins but with different architectures. Monero has mandatory privacy by default: all transactions are encrypted. Zcash offers a choice between transparent transactions (public like Bitcoin) and shielded ones (encrypted with zk-SNARKs). Monero uses ring signatures (mathematically less rigorous but more battle-tested in production); Zcash uses zk-SNARKs (mathematically stronger). Monero has no fixed maximum supply; Zcash does (21M).

Monero remains legal to hold in most jurisdictions, but listing on regulated exchanges has been significantly restricted. In the European Union under MiCA, regulated exchanges have delisted XMR. In the United States some exchanges have removed it under regulatory pressure, although it remains available on DEXs and decentralized exchanges. Tax traceability remains the holder's responsibility.

Monero is the most battle-tested privacy coin in production. The U.S. IRS offered a $625,000 reward in 2020 to anyone who could break its privacy, implicit proof of its technical robustness. However, there are known attack vectors against ring signatures using statistical samples in specific scenarios. Privacy is high but not infallible; it is advisable to follow good operational practices.