The price of bitcoin slumped again today after Bitfinex closed its order book, citing issues with its post-trade processing.

The Hong Kong-based exchange, which witnessed a 'flash crash' just last week, halted trading for a seven-hour period this morning. The Bitfinex price promptly fell a further 3.8% when it reopened at 12:31pm UTC.

There was an energetic solar event which happened nearly at the same time according to NASA satellite data. The space agency's Solar Dynamics Observatory (SDO) captured an image of the flare, which erupted at 3:33 a.m. EDT (0733 GMT) this morning from an Earth-facing sunspot known as Active Region 2403

Energetic electromagnetic events are known to effect sensitive electronic with their microscopic circuitry. More proof that the Earth's weakening magnetic field is allowing more energetic events to have an effect here on the ground. The most memorable solar event was the 1859 Carrington Event, during which current built up in telegraph wires to the point of setting telegraph offices ablaze. They even saw The Aurora Bourealis in the Caribbean.

 In a statement on Reddit, Zane Tackett, Bitfinex's director of community and product development, said: "Earlier today, at 5:27 UTC, we encountered an issue with post-trade processing, upon which we decided to halt trading to ensure consistency in the order book."

Users were given a 15-minute window to cancel their orders before trading restarted. Many expressed frustration with the beta service, which has been plagued by technical glitches that Bitfinex's Phil Potter attributed to its transition to AlphaPoint software.

According to Bitcoinity data, the exchange handled 22,400 trades today, down from 81,500 this time last week. Since the flash crash, it has been shunted to the fourth most popular exchange, succeeded by Huobi and BTC China.

Last week's flash crash at Bitfinex saw the CoinDesk Bitcoin Price Index fall 14% to a four-month low of $214.03. At press time, it remains $30 below pre-flash crash levels.

Besides Bitfinex, a bitcoin market maker told CoinDesk the slump could also be due to the uncertainty around Bitcoin XT – the contentious client aiming to 'fork' bitcoin. He said:

"Brittle markets as evidenced by Bitfinex's downtime today, coupled with overhang from the block size debate, mean a lot of people don't want to be the last ones to be able to sell."



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