Monero

Monero is a privacy-focused cryptocurrency launched in April 2014 as a community fork of Bytecoin. It was built on the CryptoNote protocol originally introduced in 2013, and has since become the gold standard for financial privacy in the blockchain space. Unlike Bitcoin, where all transactions are publicly visible on the blockchain and can be traced with off-the-shelf analytics tools, Monero makes every transaction private by default — the sender, receiver, and amount are all hidden from outside observers at the protocol level, not as an opt-in feature.

Monero achieves this through three core privacy technologies working in concert. Ring signatures mix a user's real transaction input with a set of decoy inputs drawn from prior on-chain outputs, making it computationally infeasible to determine which participant is the actual signer. Since the March 2022 hard fork, the default ring size is 16 (one real + 15 decoys), providing meaningful ambiguity for chain analysis. Stealth addresses generate a fresh one-time public address for each incoming transaction, derived from the recipient's view and spend keys, so no two payments can be linked to the same recipient wallet by looking at the blockchain. RingCT (Ring Confidential Transactions), introduced in 2017, hides the transaction amounts using Bulletproofs — a compact zero-knowledge range-proof system that dramatically reduced Monero transaction sizes and fees when adopted. Together, these features make Monero transactions untraceable and unlinkable by default.

Monero uses a dynamic block size that adjusts automatically based on sustained demand, avoiding the fee-market volatility that periodically plagues Bitcoin and Ethereum. Its RandomX mining algorithm, deployed in November 2019, is specifically designed to be efficient on general-purpose CPUs and to resist specialised ASIC hardware — the goal being to keep mining accessible to ordinary people with regular computers and to prevent hash-power concentration among a handful of ASIC producers. This commitment to egalitarian mining supports one of the most geographically and operationally distributed mining networks in cryptocurrency.

The Monero development roadmap continues to advance the state of practical privacy. Full-Chain Membership Proofs (FCMP++), currently in development, are intended to replace ring signatures with a much larger anonymity set drawn from the entire chain history, plus improved auditability and simpler proofs. Seraphis and Jamtis (the associated address format) are longer-term projects that would enable further protocol changes including 'sealed accounts' and improved multi-signature and view-only wallet features. Since the mid-2020s Monero has also faced increasing exchange delistings — Binance delisted XMR in early 2024, following similar moves by Kraken (in the UK), OKX, and others — reflecting mounting regulatory pressure on privacy coins in various jurisdictions.