- Bitcoin hit a low of $17,601 on June 19 and is up around 31% since then as of Friday's trading price, according to Coin Desk data. Ether also hit its recent low on June 19 at $880.93, but has surged 106% since then.
- The huge divergence in performance in the two cryptocurrencies come down to one major factor: a big upgrade in the Ethereum blockchain called the "merge."
- Analysts said any further delays to the Ethereum upgrade could derail the massive rally.
Since finding a bottom in mid-June, ether has massively outperformed bitcoin as investors anticipate a major upgrade to the Ethereum blockchain.
Bitcoin hit a low of $17,601 on June 19 and is up around 31% since then as of Friday's trading price, according to Coin Desk data.
Ether also hit its recent low on June 19 at $880.93, but has surged 106% since then.
The huge divergence in performance in the two cryptocurrencies come down to one major factor: a big upgrade in the Ethereum blockchain. Ether is the native cryptocurrency of the Ethereum network.
Ethereum's upgrade, called the "merge," is slated to take place on Sept. 15 after numerous delays. The blockchain will change from a so-called proof-of-work system to a model called proof-of-stake. A full explanation of the merge can be found here.
Proponents say that the move will make the Ethereum network faster and more energy-efficient.
"The upcoming Ethereum Merge is the biggest narrative in crypto right now and explains why Ether has left Bitcoin in its wake in the past month," Antoni Trencher, co-founder of crypto trading platform Neo, told CNBC via email.
Sustainable rally?
Both bitcoin and ether are still more than 60% off their all-time highs — which were reached in November — as a result of a crash in the crypto market this year.
The industry has been plagued by a swathe of bankruptcy and liquidity issues and failed projects, which led to nearly $2 trillion of value wiped off the entire market since the peak in mid-November.
But the recent ether rally, which has seen its price double in the space of two months, has been rapid.
One analyst said that the rally could continue, but there may be some resistance at around the $2,000 mark. Ether was trading at $1,814 on Friday.
Jacob Joseph, research analyst at data service Crypto Compare, said that with no Federal Open Market Committee meeting scheduled for August and stocks seeing a rebound, "it is reasonable to believe Ethereum can still rally as we edge closer to the Merge."
"However ... $2,000 has proved to be a major resistance for Ether, and the asset needs more wind behind its sail to break that level."
Joseph added that bitcoin is unlikely to outperform ether in the near term.
There are risks to the ether price rally, according to Trencher.
"Any further (unlikely) delays to the mid-September Merge will see an unwind in a large portion of Ether's 50% rally since mid-July," he said.
There is always the chance that traders take profits too on the huge rally, Trencher said.
"The Merge, if successful, might well prove to be a 'buy the rumor sell the news' type event, given the jaw-dropping gains we've seen in Ether," Trencher added.
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