“Crypto exchange Coinbase has halted all ethereum classic transactions, withdrawals and deposits due to a series of blockchain history reorganizations on the network. Ethereum classic saw more than 100 blocks “reorganized” during a potential 51 percent attack late Sunday, according to at least two different block explorers – Bitfly (Etherchain) and Blockscout. Coinbase said in its blog post that it detected some 88,500 ETC being double-spent (totaling some $460,000).”

“Unchained Capital today announced that they have released an open-source multisig contract for Ethereum. The smart contract enables Ethereum holders and services to take part in multisig transactions safely and simply using their hardware wallets. The smart contract can easily be accessed via a hosted dApp. As part of the release, Unchained is also running a bug bounty program with potential awards up to $150,000.”

“Digital currencies and the wallets that hold them have become an increasingly attractive target for digital pickpockets, resulting in millions of real dollars’ worth of lost currency. A $50 million heist of Ethereum currency last year exploiting weaknesses in the cryptocurrency’s underlying software threatened to break the Bitcoin competitor. But a new security bug in a popular Ethereum wallet platform has caused what amounts to a bank freeze on scores of high-value wallets.”