51% Attacks

(Kevin Ku/Unsplash)
Crypto Long & Short: 51% Attacks and Open-Source Value
Ethereum Classic's recent 51% attacks highlight the value of large open-source networks such as Bitcoin and Eth – it’s about more than hashrate.
(Kevin Ku/Unsplash)

Shutterstock (modified with PhotoMosh)
Ethereum Classic Attacker Successfully Double-Spends $1.68M in Second Attack: Report
The attacker attempted to double-spend roughly $3.3 million during the second attack.
Shutterstock (modified with PhotoMosh)

Ethereum classic (CoinDesk archives)
Ethereum Classic Suffers Second 51% Attack in a Week
Ethereum Classic has suffered a 4,000-block-long reorganization, its second such incident in five days. The first attack, which saw more than 3,000 blocks reorged, had an atta...
Ethereum classic (CoinDesk archives)

Ethereum classic (CoinDesk archives)
Ethereum Classic Suffers Reorganization That Resembles 51% Attack Amid Miner Complications
Developers advise exchanges to pause ETC deposits and withdrawals.
Ethereum classic (CoinDesk archives)

bitcoin, gold
Attempted 51% Attack on Bitcoin Gold Was Thwarted, Developers Say
A 51 percent attack on Bitcoin Gold was unsuccessful.
bitcoin, gold

Credit: Shutterstock
Bad Actors Rent Hashing Power to Hit Bitcoin Gold With New 51% Attacks
The two attacks last Thursday saw over $87,000 in the cryptocurrency double spent.
Credit: Shutterstock

Credit: Shutterstock
The Vertcoin Cryptocurrency Just Got 51% Attacked – Again
Vertcoin, a crypto project that sets out to keep mining power decentralized, has suffered its second 51-percent attack in a year.
Credit: Shutterstock

Binance Logo.
What a Bitcoin 'Reorg' Is and What Binance Has to Do With It
The suggestion to reverse transactions on the bitcoin blockchain has caused an uproar on social media with several community members espousing such an idea is not only infeasi...
Binance Logo.

oil, concrete
51% Attacks for Rent : The Trouble with a Liquid Mining Market
As the global pool of hashing power grows more liquid, arbitrageurs may see a financial incentive in "rent-a-miner" attacks.
oil, concrete

weight, numbers
The Ethereum Classic Attacker Has Sent a Bigger Message
If a permissionless blockchain doesn’t have a large enough community of users, developers and miners, its vulnerable, writes Michael J. Casey.
weight, numbers