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In recent weeks, ripple's value has spiked, making it the second most valuable digital currency and bringing it newfound attention.

The relatively obscure cryptocurrency, also known as XRP, is now worth about $2.60 with a market cap of more than $100 billion, according to Coinmarketcap. In early December, it was trading at just 25 cents.

Even with the spike, ripple is worth considerably less than bitcoin. After a tumultuous December, bitcoin was trading around $15,000 late Tuesday with a market cap of more than $250 billion.

Related: Bitcoin boom may be a disaster for the environment

What's different about ripple is its supply is largely controlled by just one company, San Francisco-based Ripple. There are reports of current and former Ripple executives becoming cryptocurrency billionaires from its recent boom.

Ripple launched in 2012 to facilitate global financial transactions. It differentiates itself from other digital currency platforms by its connections to legitimate banks. Companies that use the Ripple platform include Santander (SANPRA), Bank of America (BAC) and UBS (UBS).

In recent weeks, financial services companies in Japan and South Korea have adopted Ripple's technology, helping boost the price of the cryptocurrency.

Related: What the big names of finance are saying about bitcoin

According to Stephen Powaga, head of research at investment firm Blockchain Momentum, ripple and other some other cryptocurrencies have relatively low transaction fees, which made them popular when people began looking for alternatives to bitcoin.

But unlike Bitcoin, ripple isn't created, or "mined," by users. The company has control.

It created 100 billion ripple coins initially, and 38 billion of them are in circulation at the moment. Ripple management can release up to 1 billion coins per month, which Powaga predicts could oversaturate the market.

"It's somewhat concerning for me because if they chose to release them as quickly as possible, within a little over four years, you'd see more than a doubling of supply of ripple," he said.

That could put pressure on its price.

"I'm not certain that some of the newer market participants are fully appreciating the potential for inflation," Powaga said.

Related: Hackers take advantage of bitcoin's wild ride

Cross-border payments that can take hours with bitcoin or days with traditional financial transactions can go through in a matter of seconds with ripple, the company says.

Like bitcoin, ripple's payment network, RippleNet, uses blockchain technology.

A blockchain is a public ledger containing transaction data from anyone who uses the service. Transactions are added to "blocks," or the links of code that make up the chain, and each transaction must be recorded on a block.

-- Seth Fiegerman contributed to this report.

CNNMoney (San Francisco) First published January 2, 2018: 10:31 PM ET

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Cryptocurrency boom: Why everyone is talking about ripple