Cryptocurrency miners have, across the most popular proof-of-work (PoW) blockchains, made over $300 million mining empty blocks, not securing their network. The problem has been slowly decreasing, however.
According to blockchain research firm Diar, revenues coming from empty blocks were a “negligible portion of total revenues,” but have surpassed the $300 million mark. In total, miners have made over $21 billion since the start of each blockchain, with Bitcoin accounting for over half of that amount.
The report reads:
Despite a year-on-year decline in the number of empty blocks being solved for Bitcoin, miners have now exceeded $100Mn in revenue since 2012 providing no real value to the network
Per Diar’s report, the number of empty blocks being mined across the cryptocurrency space has halved since 2016, and dropped by almost 20% last year, compared to 2017. In total, Litecoin has rewarded miners with $125 million for solving empty blocks, while Ethereum rewarded them with $113 million, and Bitcoin with little over $100 million.
Ethereum miners, the report adds, earned over $67 million from empty blocks in 2017, when the prices of most cryptocurrencies surged to new all-time highs. This, per Diar, is “by far the greatest reward for a full year across all blockchains.” Since then, ETH has seen a 95% drop in empty blocks mined.
#Ethereum miners have earned a whopping $113Mn from empty blocks. But progress has been made with the number of empty blocks plummeting 98% from peak in 2016. More in this week's Diar: https://t.co/iCPahRo1mH pic.twitter.com/Rci92CLTzY— Diar (@DiarNewsletter) February 26, 2019
Mining less empty blocks has been helping the Bitcoin network’s fees get lower, as “more blocks are finding transactions.” Compared to Bitcoin, BCH has seen an additional 3,335 empty blocks since August of 2017 – when it forked off the Bitcoin blockchain – despite having less transaction volume.
The report adds the figures should be alarming, as miners have essentially been earning the equivalent of $5 million per month for doing nothing.
The value that is being rewarded for empty blocks should strike alarm bells as revenues across major networks have earned miners for Proof-of-Nothing with $335Mn - the equivalent of $5Mn per month.
PoW-based blockchains reward miners with a specific amount of cryptocurrency per mined block, along with the fees from the transactions included in said block. Diar notes that while the fees today are a small incentive for miners, as rewards drop because of halving events, they will matter in the future.
Fees on the Bitcoin blockchain notably hit an all-time high in December of 2017, when BTC itself got close to the $20,000 mark. Since then, they’ve been dropping because of a decrease in empty blocks, SegWit adoption, transaction batching, and increased Lightning Network adoption.