What Are They and Which Cryptos Are the Most Susceptible?


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For all its complexity and built-in safety measures, it’s surprisingly easy to hack the blockchain.

Wanna find out how?

All it’s a must to do is provide greater than half of the ability to it — even for just some moments. Then, growth. You can block different miners, double-spend your crypto, and extra. Go nuts.

This brute drive method to hacking a blockchain known as a 51% assault. And regardless of the rising computing value to tug it off, it nonetheless occurs, even to main cryptocurrencies.

So how does a 51% assault work? Which blockchains have been hit? How do these assaults have an effect on crypto costs, and as an investor, must you be fearful?

Let’s examine 51% assaults.

The Short Version:

  • 51% assaults can happen when a single group or entity controls nearly all of the hashrate i.e. mining energy behind a blockchain.
  • This allows the attacker to govern new blockchain information, permitting them to double-spend their cryptocurrency.
  • Bitcoin Cash and Ethereum Classic have been hit by 51% assaults, and technically talking most proof-of-work cryptos are weak
  • Low-cap, low hashrate blockchains are essentially the most weak. You can defend your self by buying and selling on exchanges with deposit insurance coverage.

What Is a 51% Attack?

A 51% assault begins when a crypto miner or group of miners controls greater than half of the mining hashrate of a single proof-of-work (PoW) blockchain.

Then, ought to they select, they’ll abuse their majority share and successfully “hijack” the blockchain. This would allow them to dam or reverse transactions, double spend crypto, and in any other case manipulate the information inside for their very own monetary achieve.

Now, there’s loads to unpack there, so let’s begin in the beginning.

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What Is a Proof-of-Work Blockchain?

A blockchain is a large on-line ledger — not not like an enormous Google Doc that your complete world shares.

Data can solely be added to the blockchain if nearly all of the mining computer systems powering the blockchain agree that the transaction is legitimate. This process-heavy validation technique known as “proof-of-work.”

Now, the immense complexity of PoW is what retains the blockchain safe. You can’t simply go into the blockchain and provides your self 1,000 bitcoins. In order to do this, nearly all of mining computer systems must “agree” along with your edit earlier than legitimizing it.

Ergo, issues get messy when a single entity controls nearly all of a blockchain’s energy i.e. hashrate.

What Is Hashrate?

Hashrate refers back to the complete quantity of computing energy required to take care of a blockchain. For instance, the Ethereum blockchain at present requires 996.82 terahashes per second (Th/s) to take care of.

For reference, a top-of-the-line Nvidia RTX 3080Ti graphics card has a hashrate of 121.90Mh/s. So you’d want roughly 8.24 million of them to energy your complete Ethereum blockchain.

It may assist to consider hashes like votes. The Ethereum blockchain is basically soliciting billions of “votes” per second to validate transactions, which makes it extraordinarily troublesome to idiot or manipulate.

However, if you will discover a solution to provide nearly all of the votes, you now management the blockchain, and get to resolve which crypto transactions get blocked, added, reversed, and so forth.

Which leads us to a 51% assault.

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51% Attacks: Quick Summary

So, to recap:

  1. A PoW blockchain validates and provides transactions by way of decentralized consensus, i.e. “votes” from mining computer systems all over the world.
  2. The hashrate is like the overall variety of “votes” powering the blockchain.
  3. If you may amass sufficient energy to regulate 51% of the “votes,” you management the blockchain and get to find out which transactions get added, blocked, and reversed for private monetary achieve.
  4. This means that you can create a “shadow chain” that overwrites the “trustworthy chain.”

That, in essence, is what a 51% assault is. Control the votes, management the information.

Sounds easy in idea, however exhausting to execute. Has anybody pulled it off?

Examples of 51% Attacks

51% assaults are uncommon, however they do occur. Here are two of essentially the most notorious examples:

Bitcoin Gold in 2018 and 2020

Bitcoin Gold (BTG) launched in October, 2017 underneath the slogan “make Bitcoin decentralized once more.” The thought behind the offshoot crypto was to make mining simpler for small-time miners for the reason that hashrate for Bitcoin had gotten approach, approach too demanding.

However, the low hashrate additionally made BTG uniquely engaging to 51% attackers since they wouldn’t want practically as a lot laptop energy to hijack it.

Sure sufficient, BTG was hit by its first 51% assault in 2018 resulting in an $18 million loss. Then, regardless of improved safety measures, BTG was hit twice in January 2020. Attackers collectively eliminated 29 “trustworthy blocks” and added 29 of their very own, resulting in a roughly $70,000 loss.

In these instances, the 51% attackers have been eradicating information of their very own BTG expenditures, permitting them to spend their BTG twice — a typical type of theft known as double-spending.

Ethereum Classic in 2019 and 2020

Ethereum Classic (ETC) was born in 2016 when the unique Ethereum was compromised resulting from a flaw in certainly one of its good contracts generally known as The DAO (it was a Decentralized Autonomous Organization).

A safer model of Ethereum branched off which adopted the Ethereum identify (ETH) whereas the unique Ethereum troopers on as Ethereum Classic (ETC).

Sadly, ETC may by no means shake its fame as “insecure Ethereum,” resulting in a restricted pool of miners and thus a low, weak hashrate.

Sure sufficient, ETC was hit by a 51% assault in January 2019 with $1.1 million price of double-spending occurring. It was hit once more thrice in August 2020, with hackers reorganizing practically 8,000 blocks permitting them to double-spend over $9 million this time.

Massive oof. So what was the fallout? How did these 51% assaults have an effect on the values of the stricken cryptos and the market as a complete?

How Does a 51% Attack Affect Cryptocurrency?

Surprisingly, 51% assaults don’t appear to have a lot of an influence available on the market.

Heck, they hardly even influence the values of the victimized cryptos.

BTG took a small, 5% dip after the January 2020 assault made headlines, however one may simply write that off to common market volatility:

Source: CoinMarketCap

Similarly, ETC took a ~20% dip in Q3 2020 however shortly recovered to pre-attack ranges by This fall.

Source: CoinMarketCap

Why Don’t 51% Attacks Affect Prices?

Since crypto costs are 100% speculative, we’ve got to dive into the thoughts of a dealer for the reply.

Why wouldn’t BTG and ETC merchants abandon their positions after a 51% assault?

It’s seemingly resulting from a mix of things, together with however not restricted to:

  • 51% assaults goal small-cap cash which have extra devoted communities
  • HODL/YOLO mindset
  • Faith that the builders will enhance safety
  • Hacks generate publicity, and there’s no such factor as unhealthy publicity
  • Exchanges sometimes freeze buying and selling within the brief time period, which not directly prevents a panic promote
  • Stolen funds are insured by the exchanges

That final bullet is why many say that the exchanges are the true victims of a 51% assault. After the 51% assault on ETC in August 2020, OKX’s deposit insurance coverage meant they needed to pay traders again $5.6 million.

That sucks for the change, positive. But if traders have been OK and costs have been OK, does that imply you don’t have anything to fret about?

How Do 51% Attacks Affect Investors?

Even with deposit insurance coverage and secure values, traders can nonetheless be victimized by a 51% assault.

As talked about, exchanges sometimes reply to an assault by freezing all buying and selling on that blockchain and placing the builders on discover for a right away repair.

If the builders don’t reply, the exchanges threaten to delist the stricken cryptos to hedge their losses from insurance coverage payouts.

For a small group of traders buying and selling a low-cap coin, a buying and selling freeze adopted by a delisting may very well be inconvenient at greatest, a demise sentence at worst. It didn’t occur to both BTG or ETC, but it surely may.

As a Crypto Investor, How Concerned Should I Be of a 51% Attack?

It relies upon which cryptos you dabble in.

Most in style cash nowadays (BTC, ETH, LTC) have a particularly excessive hashrate, which suggests it’s just about inconceivable for any single entity to amass 51% of the ability essential to assault it.

For instance, to conduct a profitable Bitcoin 51% assault, you’d must devour extra electrical energy per second than your complete nation of Singapore.

Plus, even when somebody did amass that a lot computing energy, the blockchain provides them extra motivation to mine it than to hack it. Case in level, Coin Telegraph calculated that the BTG hacker “would’ve recouped across the similar worth in block rewards.”

That all being mentioned, proof-of-work cryptos with a small market cap (<$1 billion) and a low hashrate (<100 GH/s) are nonetheless extremely weak. It’s not inconceivable for hackers to lease simply sufficient computing energy to amass an assault and overwrite some blocks.

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What Can I Do To Protect Myself From a 51% Attack?

Here are a number of methods crypto traders can defend themselves from the damaging fallout of a 51% assault:

  • Invest in proof-of-stake cryptos which might’t be focused
  • Focus on cryptos with lively, passionate dev groups who’re more likely to reply shortly within the occasion of an assault – or higher but, work exhausting to forestall one within the first place
  • Only commerce weak, low-hashrate cryptos on exchanges with deposit insurance coverage

Bottom Line

51% assaults happen when a single group or entity takes management of nearly all of the mining energy behind a selected blockchain. This “voting majority” allows them to govern information, double-spend, and in any other case trigger havoc.

Thankfully, your common crypto investor doesn’t have to fret about them every day. The hashrate for main cryptos are so excessive nowadays that it’s change into nearly inconceivable to hack them by way of brute drive. It’s extremely unlikely that a person (or perhaps a group) may pull off a Bitcoin 51% assault or an Ethereum 51% assault as we speak.

But when you dabble in low-cap, low hashrate altcoins, it doesn’t damage to have protections in place. 

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