Bitcoin's limited supply is about to get a bit more limited.

Barring an unforeseen event, the 17 millionth bitcoin is likely to be mined in the coming day, data from Blockchain.info shows, a development that would mark yet another milestone for the world's first cryptocurrency. That's because as per bitcoin's current rules, only 21 million bitcoin can ever be created.

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Stepping back, the milestone, the first million-bitcoin marker to be crossed since mid-2016, is perhaps noteworthy as yet another reminder of the technology's core computer science achievement - digital scarcity created and enabled by shared software.

In short, bitcoin's code, since cloned and adapted by scores of other upstart cryptocurrencies, ensures that only a set number of new bitcoins are introduced to its economy at intervals. Miners, or those who operate the hardware necessary to track bitcoin's transaction set, are rewarded with this scarce data every time they add new entries to the official record.

Still, there's a lot of variability in the process.
Of note is that it can't be precisely predicted when the 17 millionth bitcoin will be mined or who will mine it, due to the many minute variances that are created in keeping a common software in sync. That said, there's a relative predictability. Each bitcoin block produces 12.5 new bitcoin, and as bitcoin blocks occur roughly every 10 minutes, about 1,800 new bitcoin are created each day.

As such, it's perhaps best to view this event as a "psychological barrier," Tetras Capital founding partner Alex Sunnarborg told CoinDesk, one that is interpreted differently by different communities.

Sunnarborg, for example, sought to stress that another way to interpret the result is that 80 percent of all the bitcoin that will be ever created have now been mined. In other words, only about one-fifth of the eventual supply remains for miners and future buyers.

Others see the milestone as one that's ripe for appreciation of the technology and its achievements.

"I think it is awesome," Tim Draper, the venture capitalist who bought millions of dollars worth of bitcoin seized by the U.S. government at auction in 2014, said of the coming milestone.