Trading volumes reported by exchanges in Asia became a talking point again over the past weekend, after some companies altered the way trades are counted on bitcoin futures markets.

The latest issue arose last week when OKCoin's manager of foreign operations Zane Tackett posted a thread on reddit's 'Bitcoin Markets' page, titled "You might have noticed OKCoin futures volume experienced a sudden rise (doubled) over night, here's why".

OKCoin, Tackett wrote, had noticed competitors 796.com and BitVC (a subsidiary of Huobi) were employing a counting method that regards a single bitcoin traded as two units: one bought and one sold.

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