Bitcoin fever exposes crypto-market frailties

Bitfinex said it had been under a sustained DDoS attack since last week

As bitcoin raced to another record high on Tuesday, one of the biggest providers of digital currency wallets, Coinbase, went down under the weight of traffic, leaving many of its more than 10 million customers unable to access their funds.

At the same time, Bitfinex, the world’s biggest bitcoin exchange by trading volume, said it was under a heavy denial-of-service (DDoS) attack, meaning its servers had been intentionally flooded with junk online requests, taking down its website and crippling its services.

The latest outages show how the market infrastructure for an immature and volatile instrument that millions of investors have piled into