Just as Wall Street is paying more attention to bitcoin, a rival is increasingly threatening to become the top dog among cryptocurrencies.

Ethereums market capitalization is nearing bitcoins, as shown in the chart below from CoinMarketCap.

As of Wednesday, bitcoin BTCUSD, -5.37% (shown in orange on the chart) accounted for 39% of the combined market capitalization for all cryptocurrencies, down sharply from 87% on Feb. 25.

Blame the erosion on ethereum (shown in purple), which now makes up 31% of the total market cap, up from just 5% less than four months ago.

If ethereums market cap overtakes that of bitcoin, then The Flippening will have happened. That is the term that many people are using to refer to that shift, according to a post at the Flippening Watch blog.

Bitcoins market cap on Wednesday was around $45 billion and its price was just below $2,800, according to data from CoinDesk and CoinMarketCap. Ethereums market cap recently stood at $36 billion and its price at around $390.

Read more: Cryptocurrencies top $100 billion in market capitalization

Dont miss: 3 reasons why bitcoins surge may not be a bubble

By some metrics, ethereum already has eaten bitcoins lunch.

It has almost five times as many nodes in its network as bitcoin, meaning more people are using their computers to support it, a Motherboard report notes. Ethereum also has more transactions per day, the report adds.

Check out: Ethereum has soared but is it ready for prime time?

But some traders remain skeptical of ethereum:

In the screenshot in the above tweet, ICO refers to an initial coin offering, a new way to raise money. One startup reportedly raised nearly $150 million this week via an ICO.

As their prices have soared, cryptocurrencies increasingly have attracted the attention of Wall Streets analysts.

A Goldman Sachs technical analyst issued a bearish take on bitcoin earlier this week, leading the Zero Hedge financial blog to quip that probably means that bitcoin is set to make new all-time highs shortly.

Meanwhile, Morgan Stanley analysts have predicted that cryptocurrencies will not rally that much more unless they get governmental acceptance, including more regulations.

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How cryptocurrency ethereum looks set to overtake bitcoin in one chart - MarketWatch