• Bitcoin surges over 120% and hits $100,000 milestone in 2024

• Sector market value reaches $3.5 trillion

• Institutional adoption grows

• Trump's re-election boosts industry confidence

Dec 31 (Reuters) - Bitcoin BTC= more than doubled in 2024 driven by the U.S. markets regulator's approval for exchange-traded funds tied to its spot price, and optimism over easing regulatory hurdles with Donald Trump set to return to the White House.

The world's largest and most well-known cryptocurrency hit $100,000 earlier this month, a milestone that has ignited 'animal spirits' among supporters of the once-nascent asset class.

A more than 120% surge in bitcoin this year and a nearly 50% jump in ether ETH=, the second-largest cryptocurrency, have propelled the sector's market value to roughly $3.5 trillion, according to CoinGecko data.

More gains are in store for 2025, according to analysts.

"We remain convinced $100,000 is not the final milestone. We expect Bitcoin to hit a cycle-high of $200,000 in late 2025," analysts at brokerage Bernstein wrote in a client note earlier this month.

MicroStrategy MSTR.O, a software firm that has become the world's largest corporate holder of bitcoin, has seen its shares surge nearly five-fold in 2024.

The stock, which joined the benchmark Nasdaq-100 index recently, is now seen as a proxy for bitcoin, with its movement closely tied to sentiment towards the digital asset. Several smaller companies are following its playbook and allocating portions of their cash to bitcoin.

"We expect bitcoin to emerge as the new-age premier 'store of value' asset eventually replacing gold over the next decade and becoming a permanent part of institutional multi-asset allocation and a standard for corporate treasury management," the Bernstein note said.

Much of the optimism began in January when the U.S. Securities and Exchange Commission approved the first ETFs to track the spot price of bitcoin, marking a watershed moment for the broader crypto industry.

The move gave the sector institutional legitimacy and improved its mainstream appeal as traditional finance heavyweights including BlackRock BLK.N and Fidelity launched the products.

The victory of Trump, who has promised to make the United States the "crypto capital of the planet," further bolstered the industry's position later this year. Crypto advocates donated millions during the election, hoping to elect candidates that favor the sector.

Most crypto stocks have also benefited from the industry-wide rally. The big winners of 2024 are MicroStrategy, crypto exchange Coinbase COIN.O and bitcoin miner Hut 8 HUT.O

On the other hand, several other crypto miners have reeled under shrinking margins due to higher energy and hardware costs, missing the year's rally.

Shares of Riot Platforms RIOT.O, Marathon Digital MARA.O and Bit Digital BTBT.O lost between 26% and 32% this year.