Firo

About Firo (FIRO)

Firo is a privacy-focused proof-of-work cryptocurrency, launched in 2016 as Zcoin, that uses zero-knowledge proofs to hide who sent a payment, who received it and how much was sent. Its current privacy protocol, Lelantus Spark, needs no trusted setup and hides transactions inside large anonymity sets. Firo matters because its team has designed several privacy protocols that influenced other projects, and because it pairs GPU mining with a masternode layer that adds instant transactions and protection against 51% attacks.

What Is Firo?

Firo describes itself as private digital cash: "Private money, for everyone" (firo.org). It runs its own blockchain with a 2.5-minute target block time. Users can hold private balances, send to shareable Spark addresses that cannot be looked up on the chain, and use features such as Spark Names, InstantSend and the Campfire mobile wallet. The network is also expanding into confidential tokens through Spark Assets.

Who Founded Firo? (History)

Firo was founded as Zcoin in 2016 by Poramin Insom, who wrote a paper on a practical implementation of the Zerocoin protocol during his master's in Information Security at Johns Hopkins University and coded the first implementation of Zerocoin (Firo team). Reuben Yap, a co-founder who joined shortly after inception, has led strategy, development and research. Aram Jivanyan, the chief privacy architect, created the Lelantus and Lelantus Spark protocols.

The privacy technology evolved in stages: Zerocoin at launch, Sigma in 2018 (removing the trusted setup), Lelantus (hiding input and change amounts, with an anonymity set of about 65,000) and then Lelantus Spark. In 2018 the Thai Democrat Party used the Zcoin blockchain for its primary election to choose a party leader, which the team describes as the first large-scale political election on a blockchain. The project later rebranded from Zcoin to Firo.

How Firo Works

Firo uses proof-of-work mining with FiroPoW, an algorithm based on the ProgPoW 0.9.4 specification that changes with every block and is designed for GPUs while resisting FPGAs and ASICs. The DAG size is fixed at 6.7 GB so that 8 GB cards can mine (Firo FAQ).

Privacy comes from Lelantus Spark. Coins are placed in large anonymity sets (buckets), and spends prove membership with zero-knowledge proofs without revealing which coin is spent. When a set fills up, a new one starts seeded with 8,000 coins from the previous set, a design Firo calls sliding windows. Spark hides the sender, recipient and amount, supports view keys for selective disclosure, and allows threshold multisignatures. At the network level, Firo was the first cryptocurrency to deploy Dandelion++ on mainnet, which obscures the IP address a transaction came from, and it supports Tor.

Key Ecosystem Components

• Lelantus Spark: the privacy protocol, audited by HashCloak and others, with further research papers on Spark Assets (Spats), Helsing private masternode staking and Curve Trees.
• Masternodes: nodes backed by 1,000 FIRO collateral that provide LLMQ ChainLocks and InstantSend.
• Spark Assets: user-created confidential tokens on the Firo chain.
• RosenBridge: locks FIRO and mints rsFIRO on chains such as Ethereum and BNB Chain.
• FiroDEX and BasicSwap: atomic swap exchanges for self-custodial trading.
• Campfire: the mobile and lite desktop wallet developed by Cypher Stack.

FIRO Token Utility

FIRO is the native coin: it pays for transactions, rewards miners and masternode operators, funds development through the block reward, and serves as collateral for masternodes. Emission is fixed at 6.25 FIRO per block until the 21.4 million FIRO cap is reached, followed by a tail emission of 1 FIRO per block. The FAQ's economics section lists the current block reward split as 70% to masternodes, 5% to miners, 15% to a development fund and 10% to a community fund; the split has changed through network upgrades, so check the FAQ for the latest figures.

What Makes Firo Unique?

Firo avoids trusted setups while still reaching large anonymity sets, a middle path between ring-signature designs with small rings and zk-SNARK systems that need a setup ceremony. Its team's work has influenced other designs, and the FAQ notes that Spark addressing helped shape Monero's Seraphis framework.

How Firo Differs from Similar Chains

Monero uses ring signatures with decoys and is private by default. Zcash uses zk-SNARKs with very large anonymity sets but relied on trusted setups. Dash shares the masternode, ChainLocks and InstantSend model but offers only optional mixing. Firo combines large no-trusted-setup anonymity sets with a Dash-style masternode layer and GPU mining.

Use Cases of Firo

• Private payments where balances and counterparties stay hidden.
• Merchant payments, listed on Firo's merchant directory.
• Issuing confidential tokens with Spark Assets.
• Mining with consumer GPUs or running a masternode.
• Moving FIRO into DeFi on other chains via RosenBridge.

How Firo Is Secured

The chain is secured by proof-of-work mining, reinforced by masternode quorums: LLMQ ChainLocks make blocks final quickly and protect against 51% reorganisation attacks, and InstantSend lets payments confirm in seconds. The privacy cryptography has been audited, with reports listed on the research page (Trail of Bits and ABDK for Lelantus, HashCloak for Spark).

Risks and Considerations

• Regulatory pressure on privacy coins: some exchanges restrict or delist privacy-focused coins in certain jurisdictions.
• Cryptographic complexity: bugs in zero-knowledge systems can be hard to detect, which is why audits and the no-trusted-setup design matter.
• Privacy depends on usage: privacy is strongest when users send to Spark addresses and anonymity sets are well used.
• Masternode concentration: a large share of rewards goes to masternode operators.

Why Firo Matters

Firo is one of the longest-running privacy coins and a source of original privacy research. Its choices (no trusted setup, large anonymity sets, GPU mining and masternode finality) make it a distinct option among privacy-focused cryptocurrencies.

Where Can You Buy Firo?

Firo's buy page lists centralized exchanges, decentralized exchanges and coin-swapping services. FIRO can also be traded peer to peer via FiroDEX and BasicSwap atomic swaps.

Major Centralized Exchanges (CEX)

Availability varies by jurisdiction because of privacy-coin rules. Use the official buy page to see current venues.

Storage Options After Purchase

Firo offers the Campfire wallet for iOS and Android and full-node wallets from the download page and GitHub. Transactions can be checked on the Firo explorer.

Related Coins

• Monero
• Zcash
• Dash
• Horizen
• Beldex