What is Vertcoin?
👋 New to this? Just start reading at the top — it begins in plain English and gets more detailed as you scroll. Jump to any level:
🟢 The simple version
Plain English — no jargon. Start here.
Vertcoin is a Bitcoin fork with one defining mission — keeping cryptocurrency mining accessible to ordinary people by using an ASIC-resistant proof-of-work algorithm that cannot be efficiently mined by specialised hardware, ensuring consumer GPUs remain competitive.
The ASIC centralisation problem
Bitcoin mining started on CPUs, moved to GPUs, then to FPGAs, and finally to ASICs (Application-Specific Integrated Circuits) — chips designed exclusively for Bitcoin mining that outperform GPUs by orders of magnitude. The result: Bitcoin mining is now dominated by large industrial operations running specialised hardware. Ordinary people cannot profitably mine Bitcoin with consumer hardware.
Vertcoin, launched in 2014, took the position that mining decentralisation requires ASIC resistance. If the best hardware for mining is a consumer GPU, then anyone with a gaming computer can participate in securing the network. Vertcoin has maintained this position through multiple algorithm upgrades — whenever ASIC manufacturers developed chips for Vertcoin's algorithm, Vertcoin changed its algorithm.
Verthash — the current algorithm
Verthash (introduced in 2021) is Vertcoin's current proof-of-work algorithm. It is designed to be memory-intensive — requiring miners to store and access a large data file (approximately 1.2GB) during mining. This memory bottleneck means ASICs cannot gain their typical efficiency advantage: the mining speed is limited by memory access speed rather than raw computation, and consumer GPU memory is already highly optimised for this type of workload.
The One-Click Miner
Vertcoin provides a "One-Click Miner" — software that automates the entire mining setup process. A user downloads the application, clicks start, and is mining Vertcoin within minutes. This is Vertcoin's practical expression of its decentralisation mission: not just ASIC-resistance in theory, but accessible mining in practice. VTC has a maximum supply of 84 million — four times Bitcoin's 21 million, mirroring Litecoin's relationship to Bitcoin.
Is it legal in India?
Yes. VTC is a VDA under Indian law. 30% tax and 1% TDS apply. See India regulation.
🟡 A bit more detail
For when you want to go a little deeper.
Algorithm history — the ASIC war
Vertcoin has gone through multiple algorithm changes in response to ASIC development. It started with Scrypt-N (a variant of Litecoin's Scrypt algorithm with increasing memory requirements). When Scrypt-N ASICs appeared, Vertcoin moved to Lyra2RE. When ASIC manufacturers targeted that, it moved to Lyra2REv2, then Lyra2REv3. The 2021 move to Verthash represented a more fundamental redesign — a purpose-built algorithm intended to be harder to optimise in custom silicon. Each transition required a hard fork but maintained backward compatibility for transaction history.
Vertcoin is used by cryptocurrency mining enthusiasts who want to mine profitably with consumer hardware. The One-Click Miner has attracted users who want to participate in mining without technical expertise. Vertcoin uses Atomic Swaps and the Lightning Network for fast, low-fee payments. In 2018, Vertcoin suffered a 51% attack — the attacker reorganised the chain and double-spent VTC on exchanges. The attack was documented and analysed publicly by the Vertcoin community, and Verthash was developed partly in response to improve attack resistance.
The 51% attack of 2018
Vertcoin experienced a documented 51% attack in December 2018. An attacker rented GPU hashrate via NiceHash (a mining marketplace), reorganised the Vertcoin chain multiple times, and double-spent approximately $100,000 worth of VTC on exchanges. This attack was possible because Vertcoin's small hashrate made renting sufficient attack hashrate economically viable. The attack demonstrated that ASIC resistance alone does not guarantee security — a highly GPU-mineable coin can be vulnerable to rented GPU attacks from large GPU cloud mining markets. The Verthash algorithm was designed to mitigate this by making the data file requirement raise the cost of renting attack capacity.
Key Vertcoin metrics: GPU mining profitability (vs other GPU-minable coins), hashrate stability, One-Click Miner download count, and VTC network security (attack cost). Vertcoin competes for GPU mining share with Ethereum Classic, Ravencoin, and other GPU-minable coins. Live data: CoinGecko · Vertcoin Explorer.
🟣 The full technical picture
For the technically curious.
Verthash algorithm specification
Verthash is a proof-of-work algorithm that requires miners to maintain a 1.2GB "verthash.dat" data file on their mining hardware. The mining process: given a block header, a miner iteratively hashes combinations of the header data with random 64-byte slices from the verthash.dat file, seeking a hash below the current difficulty target. The specific slices accessed are determined by the intermediate hash value — meaning the order of data access is unpredictable and cannot be precomputed. This random-access pattern defeats optimisations that specialised hardware could apply to a purely computational hash function.
Source: Vertcoin documentation. github.com/vertcoin-project/verthash-paper · Vertcoin: vertcoin.org
Merge-mining prevention
Vertcoin explicitly bans merge-mining — the practice of mining multiple blockchains simultaneously (as used by Syscoin, for example). Merge-mining would allow large Bitcoin miners to simultaneously mine Vertcoin, centralising Vertcoin's hashrate in the same industrial operations that dominate Bitcoin mining. By banning merge-mining at the consensus level, Vertcoin ensures its security comes from dedicated Vertcoin miners rather than from miners whose primary incentive is another coin.
The 51% attack economics on Vertcoin changed significantly with Verthash. Before Verthash, an attacker could rent Vertcoin-compatible GPU hashrate on NiceHash for less than $1,000/hour — enough to control 51% of the network. After Verthash, the verthash.dat requirement means miners must download and store the 1.2GB file before mining. NiceHash and similar GPU rental services cannot trivially pivot their rental fleet to Verthash mining — operators must download and prepare the data file on each machine, adding overhead that makes renting attack capacity significantly more logistically complex. While not impossible, the attack surface for opportunistic rented-hashrate attacks is meaningfully reduced.
Key facts
- Algorithm: Verthash (memory-hard, 1.2GB data file, ASIC-resistant)
- VTC supply: 84 million (max)
- Mission: GPU-accessible mining, anti-ASIC, anti-merge-mining
- 51% attack: December 2018 (documented, led to Verthash development)
- One-Click Miner: Official simplified mining client
- Founded: 2014
- Block time: 2.5 minutes (same as Litecoin)