The Hardware/Software Landscape
On October 24, 2017, the Bitcoin blockchain experienced its second major hard fork in three months, giving birth to Bitcoin Gold (BTG). Spearheaded by Jack Liao, CEO of LightningASIC, the project emerged from a growing frustration with the centralization of Bitcoin mining. What started as a decentralized experiment where anyone with a laptop could contribute had evolved into an industrial operation dominated by a handful of players running warehouses full of Application-Specific Integrated Circuit (ASIC) miners.
The fork took a snapshot of the Bitcoin blockchain at block height 491,406, and every Bitcoin holder at that moment became entitled to an equivalent amount of Bitcoin Gold at a 1:1 ratio. The key differentiator, however, was not in the distribution but in the mining algorithm. Bitcoin Gold adopted Equihash — the same memory-hard proof-of-work algorithm used by Zcash — which is specifically designed to be resistant to ASIC mining and instead favors graphics processing units (GPUs) that regular consumers can purchase off the shelf.
At the time of the fork, Bitcoin was trading around $5,800, having dipped from an earlier weekly high above $6,000. The broader cryptocurrency market capitalization stood at approximately $170 billion, with Bitcoin commanding roughly 55% dominance. Ethereum held steady at $295, while Bitcoin Cash — the product of the August fork — was trading near $332.
Hashrate and Difficulty
The fundamental motivation behind Bitcoin Gold was the alarming concentration of Bitcoin’s hashrate. By late 2017, more than 70% of Bitcoin’s total network hashrate was controlled by mining pools operating out of China, many of them using Bitmain’s Antminer series. This level of centralization ran counter to the original cypherpunk ethos that birthed Bitcoin in 2009.
Bitcoin’s mining difficulty had been climbing steadily throughout 2017, making it increasingly impractical for individual miners to participate. The hashrate had surged from around 2 exahashes per second in January to over 10 EH/s by October — a fivefold increase in less than a year. This exponential growth meant that anyone without access to the latest ASIC hardware was effectively priced out of the mining game.
Bitcoin Gold’s Equihash algorithm flipped this dynamic on its head. Because Equihash is memory-intensive rather than computation-intensive, it levels the playing field between high-end ASICs and consumer-grade GPUs. A miner with a few NVIDIA or AMD graphics cards could realistically compete for block rewards without needing millions of dollars in specialized hardware. The target block time remained at 10 minutes, with a block reward of 12.5 BTG — mirroring Bitcoin’s own reward schedule.
Profitability Metrics
The immediate aftermath of the fork painted a sobering picture for Bitcoin Gold’s value proposition. Within hours of trading, BTG plunged more than 66% from its initial valuation, settling around $161 per coin. This sharp decline was driven largely by holders dumping their free airdropped coins — a phenomenon that suggested the market had limited confidence in the project’s long-term viability.
For miners evaluating the profitability equation, the calculus was straightforward. GPU mining for BTG would become available in November 2017 when the mining code was publicly released. Until then, the network was essentially operating in a pre-mining phase, with the Bitcoin Gold team having mined approximately 8,000 blocks (100,000 BTG) before public launch — a decision that attracted significant criticism and accusations of a hidden premine.
The electricity costs for GPU mining remained substantially higher per hash compared to ASIC mining on the Bitcoin network. However, the lower barrier to entry meant that miners could amortize their GPU investments across multiple cryptocurrencies — switching between Zcash, Ethereum, and Bitcoin Gold depending on which offered the best daily returns. This flexibility was itself a form of risk mitigation that ASIC miners simply did not have.
Environmental Impact
The environmental conversation around cryptocurrency mining was intensifying in October 2017, and Bitcoin Gold’s GPU-centric approach added a new dimension to the debate. While Bitcoin’s ASIC miners were incredibly efficient at their specific task, the sheer scale of the operation consumed an estimated 30 terawatt-hours of electricity annually — comparable to the power consumption of small nations.
GPU mining, while less efficient per watt for any single algorithm, benefited from the fact that graphics cards were general-purpose hardware with residual value. When a GPU became unprofitable for mining, it could be resold for gaming, AI workloads, or other compute tasks. ASIC miners, by contrast, were single-purpose machines that became expensive paperweights when they could no longer mine profitably — creating a significant electronic waste problem.
The Bitcoin Gold team positioned this as an environmental advantage: a more distributed mining network using repurposable hardware could be more sustainable in the long run, even if it was not more energy-efficient in raw terms.
Strategic Outlook
Bitcoin Gold faced considerable headwinds from the start. Major exchanges like Coinbase refused to support the fork, citing the fact that the development team had not made the code available for public review. The project’s website suffered a massive distributed denial-of-service (DDoS) attack within hours of launch, raising further security concerns. Only a handful of exchanges and wallets — including BitBay and Coinomi — offered immediate support.
The broader market reaction to the fork was mixed. Bitcoin dipped to $5,374 before recovering to the $5,500 range, and some analysts attributed this to investors who had bought Bitcoin ahead of the fork specifically to receive the airdrop, then sold their positions afterward. The pattern was familiar from the Bitcoin Cash fork in August and suggested a growing speculative dynamic around Bitcoin forks as a whole.
For miners, the strategic question was whether Bitcoin Gold could maintain enough network hashrate to remain secure. A low hashrate would make the network vulnerable to 51% attacks — a vulnerability that would eventually materialize in attacks on BTG in later years. The project’s long-term success hinged on building a dedicated community of GPU miners who valued decentralization enough to commit their resources to a network with uncertain profitability.
Disclaimer: This article is for informational purposes only and does not constitute financial advice. Cryptocurrency investments carry significant risk. Always conduct your own research before making investment decisions.
jack liao running lightningASIC while leading a fork to fight ASICs. the irony was completely lost on most people
jack_liao leading a fork to fight ASICs while running LightningASIC is the most crypto thing ever. the conflict of interest was just out in the open
rig_count_ jack liao running LightningASIC while pushing anti-ASIC fork was 2017 in a nutshell. everyone claimed decentralization while building their own grift
fork_carthage_ the Jack Liao conflict of interest was so obvious yet nobody cared. LightningASIC CEO leading an anti-ASIC fork, you cant write this
GPU mining was fun while it lasted. btw anyone else had their graphics card melt running equihash 24/7?
^ this. the BTG 51% attack in 2018 proved that smaller chains with GPU mining are actually more vulnerable, not less
Nina B. my RX580 still has the battle scars from equihash mining. those cards were built different though, still works as a doorstop
Nina B. my RX580 survived equihash mining and three crypto winters. card outlasted every fork coin it was mining lmao
my 1060 mined equihash through the whole fork season and died in 2019. card outlived half the coins it mined, respect to the 580s still soldiering on
gpu_graveyard_ RX580 surviving three winters and every fork coin is the most bullish hardware take ive read today
snapshot at block 491406. i remember claiming my BTG and selling immediately at like $260. best trade i ever made on a fork coin
wei chen selling at 260 was elite timing. i held through two 51pct attacks believing the brand would carry it. fork coins are exit liquidity with a logo
Wei Chen selling immediately was the correct play for every fork coin from that era. BTC, BCH, BTG, BSV – only the original survived
Tomas H. selling immediately was the only correct play. held my BTG thinking it would recover and watched it bleed for 3 years. lesson learned
the equihash pivot was smart in theory but BTG ended up getting 51% attacked anyway. GPU mining alone doesnt solve decentralization
Gregor W. the 51% attack on BTG proved equihash was not enough. you need enough honest hashrate relative to the rental market for GPU coins
fork_watcher the BTG 51pct attack proved equihash was speedrunning its own failure. GPU mineable just means nicehash rental costs are lower
by 2018 you could rent enough equihash for an afternoon for the price of a used gpu. asic resistance meant nothing against a rental market, the 51pct attack proved it
nicehash rental economics ended the whole asic resistance argument in one afternoon. security you can rent by the hour isnt security, plain and simple
the irony nobody mentions: gpus were the rentable commodity. asics at least have a hardware supply chain you can track, nobody asks questions when 40 rental rigs spin up for an afternoon
BTG at $260 at launch and now its basically a meme. every Bitcoin fork from that era proved the original network effect is the only thing that matters
network effect plus actual hashpower defense. BTG had neither and got 51pct attacked twice for the lesson. forks need more than a snapshot and a slogan
BTG launched at 260 dollars and its basically a rounding error now. every single Bitcoin fork proved the original was the only one with network effects
Block 491406 feels like archaeology now. BTG proved a 1:1 snapshot means nothing if the mining algorithm cant defend the chain. Two 51 percent attacks settled that.
two attacks and both times they double spent exchanges. the chain didnt just lose the hash war, it robbed the only businesses willing to list it