Bitcoin Magazine

Traders Took $8.2 Million From Polymarket’s Five-Minute Bitcoin Bets, Study Found

A new study argued that Polymarket’s five-minute Bitcoin contract became a machine for wealth transfer. It moved money from retail bettors to a small band of manipulators, and it made Bitcoin’s spot price worse in the process.

The paper, “Settlement Manipulation in Prediction Markets” by David Dai, Ruizhe Jia, and Shihao Yu of Stanford and Singapore Management University, studied a product that did not exist before February 12, 2026. 

On that date Polymarket launched a binary contract that paid $1 if Bitcoin closed a five-minute window above where it opened, and $0 otherwise. A fresh contract opened every five minutes around the clock. 

Within months, Polymarket’s five- and fifteen-minute crypto up/down markets traded more than $4 billion and tripled the platform’s daily volume. The flaw in polymarket was when the contract settled against a Chainlink oracle that averaged Bitcoin’s price across major spot exchanges. 

A trader who held the contract could buy or sell real Bitcoin in the closing seconds, drag that reference price across the strike, and win the bet.

The oracle’s blend of exchanges looked like a defense, because moving it seemed to require moving many venues at once. The authors showed it was not much of a defense. Binance, the largest crypto exchange, sat about two and a half basis points from the oracle and moved near one-for-one with it. It finished on the same side of the strike as the resolution about 85%of the time. A push that drove the Binance price a few basis points past the strike carried the outcome.

The pattern was in the Binance data. After the five-minute contract went live, net order flow in the final ten seconds before each close jumped about 50% above the pre-launch level. The spike was sharpest where a push mattered: in the 6% of cycles the market judged near-even, the jump was about 3.9 times the rest.

The reversal gave it away. Real information stays in a price; a manipulative push does not. Within ten seconds the price reverted, by about a quarter in the near-even cycles. The pushes clustered in thin hours, when a dollar of flow moved the price the most: 56% landed overnight and 44%on weekends.

Who won, who paid with these Polymarket bets

In near-even cycles, a push against the favored side flipped the winner 65% of the time, against 41% in normal trading. Even when one side held a 90-to-100% chance before the close, a push against it reversed the outcome 34% of the time, against 1% in cycles with no push. A bet the market treated as near-certain lost one time in three.

Because Polymarket settled on a public blockchain, the authors traced each wallet. Just 821 traders fit the manipulator profile, about one in three hundred of the 243,000 who traded the contract. They took $8.2 million in the pushed cycles and broke even in the rest. Of the losses, 93% fell on retail.

The authors ruled out hedging as the innocent explanation. A binary contract carried little exposure to hedge once one side was near-certain, yet those were the cycles a push flipped. And the trades arrived in one burst in the final fifty seconds, not as a position built over the window.

The remedy

The fix was the contract’s horizon. Manipulation was absent from the fifteen-minute contract, because a longer window took in more ordinary trading before the close and made a fixed push a weaker force. The stakes reached past crypto: Nasdaq and Cboe each filed with the SEC to list binary asset-price contracts on equity indices, which would carry the same risk onto larger markets.

This post Traders Took $8.2 Million From Polymarket’s Five-Minute Bitcoin Bets, Study Found first appeared on Bitcoin Magazine and is written by Micah Zimmerman.

Bitcoin Magazine

Bitwise Sees a Bottom in Bitcoin’s Worst Vibes Yet: ‘Darkest Before the Dawn’ 

Bitcoin closed the second quarter of 2026 mired in its deepest and longest downturn since the last bear market, according to Bitwise Asset Management’s newly released Q3 2026 Crypto Market Review. 

Yet the $9 billion crypto asset manager frames the pain as a setup rather than a collapse, arguing the industry has never been sturdier beneath the surface.

Bitcoin fell 13.4% in Q2 and is down 32.9% for the year, dropping below $60,000 in June for the first time since 2024 and landing roughly 52% under its October peak of $126,080. That extends what Bitwise calls “crypto winter” to nine months and marks the third straight quarter of negative returns for the broader Bitwise 10 Large Cap Crypto Index, its longest losing streak since 2022. 

Chief Investment Officer Matt Hougan does not sugarcoat it, writing that “the vibes in crypto are among the worst I’ve seen in my eight years in this industry.”

Even so, bitcoin held up far better than most of its peers. Its 32.9% year-to-date decline was the shallowest drawdown among major large-cap tokens, easily beating Ethereum’s 46.9% slide, Solana’s 40.6% and Cardano’s 56.5%. 

Bitcoin now commands a 64.2% share of the roughly $1.88 trillion total crypto market and carries a 77.4% weight inside the Bitwise 10 index, cementing its status as the sector’s relative safe haven even in a broad selloff.

Bitcoin ETF outflows hit a record

The quarter’s most jarring statistic came from the exchange-traded product complex that has anchored bitcoin’s institutional era. U.S. spot bitcoin ETPs bled $4.9 billion in Q2, their worst quarter since launching in January 2024, according to Bitwise. 

Assets under management still stand at $72.4 billion, with $53.4 billion in cumulative net flows since inception, but the reversal underscored how quickly professional sentiment can sour. 

Filings show investment advisors hold about 43% of professionally owned ETP shares and hedge fund managers another 28%, with Jane Street ($1.8 billion) and Millennium ($1.0 billion) the largest reported holders.

Structural demand nonetheless continued to outstrip new issuance. Bitwise noted in their report that spot ETPs and public companies have together bought roughly 3.6 times the bitcoin mined since the ETFs debuted — about 1.55 million BTC of demand against just 455,416 BTC of new supply.

Treasury companies keep buying, but Strategy blinks

Public-company bitcoin treasuries grew to 1.28 million BTC, up 11.3% quarter over quarter and equal to 6.11% of the 21 million cap, even as the number of firms holding bitcoin slipped by three to 184. Companies added 130,467 BTC in Q2. Strategy remains the runaway leader at 846,842 BTC, trailed by XXI (43,514), Metaplanet (40,177), MARA Holdings (35,303) and Bitcoin Standard Treasury Company (30,021).

The most symbolically loaded move belonged to Strategy, which sold bitcoin for the first time since 2022 — offloading $218 million late in the quarter to fund dividend obligations while keeping holdings valued at $52.3 billion and a $2.55 billion cash reserve. Falling prices punished the equity harshly: Strategy’s stock (MSTR) dropped 30.3% in Q2 and 42.8% year to date, making it one of the worst performers among crypto equities.

The report also touched on several developments that are reshaping bitcoin’s market plumbing. The CFTC approved the first bitcoin perpetual futures at a U.S.-regulated exchange, Kalshi, pulling crypto’s dominant derivative onshore. 

Charles Schwab launched retail spot BTC trading, and E*Trade extended access to its 8.6 million users. On the regulatory front, the market-structure CLARITY Act stalled in the Senate over ethics provisions, with prediction markets pricing its 2026 passage odds at just around 20%, down from 75% in May. 

Bitwise argues that if CLARITY passes it would likely mark the bottom, and if it fails the industry keeps building under friendly regulators.

Hougan’s core argument is one of cycle-over-cycle progress. Bitcoin’s seasonality data offers modest near-term hope, with July historically averaging a 10.7% gain. 

And the firm’s portfolio work still shows a 5% bitcoin allocation adding to a traditional 60/40 mix in 100% of three-year rolling windows since 2014.

“The market is quoting bear-market prices on an industry that is twice the size it was at the last cycle’s bottom,” Hougan writes — a foundation, he says, that “determines what grows in the spring.”

Bitcoin is trading below $62,000 today.

This post Bitwise Sees a Bottom in Bitcoin’s Worst Vibes Yet: ‘Darkest Before the Dawn’  first appeared on Bitcoin Magazine and is written by Micah Zimmerman.

Bitcoin Magazine

Polymarket Turns On Instant Bitcoin Deposits Via Lightning Network, Powered by Spark

Polymarket, the crypto-native prediction market, has begun supporting instant Bitcoin deposits over the Lightning Network. The feature uses infrastructure from Spark, a Bitcoin protocol built for payments and stablecoins. 

In a post on X, Spark told users they can deposit BTC to the platform with more speed and more privacy than the older method offered.

The move extends a funding push that started in October 2025, when Polymarket switched on standard on-chain Bitcoin deposits. Those deposits carried a wait: most on-chain Bitcoin transactions need three to six confirmations, a window of 10 to 60 minutes, before a platform credits an account. 

The on-chain route carried a higher minimum deposit, a reflection of bridging costs. For a trader who wants a position on a live market, both the delay and the fee are a cost.

Lightning and Spark close the gap. Spark validates a Bitcoin transaction at the moment it broadcasts, checking for double-spend risk, fee adequacy, and replace-by-fee flags. 

JUST IN: The world's largest predictions market Polymarket now accepts Bitcoin Lightning deposits! pic.twitter.com/CxOObnbyJ2

— Bitcoin Magazine (@BitcoinMagazine) July 7, 2026

The protocol credits the deposit in under a second and absorbs the confirmation risk, a design Spark markets as zero-conf. 

Polymarket does not have to manage confirmation thresholds or run its own Lightning nodes; a single Spark SDK handles on-chain, Lightning, and stablecoin rails.

Spark keeps deposits self-custodial. Each wallet ties to the user’s own keys, so the protocol, not Polymarket, carries the operational load, and users retain control of funds until a trade. 

Spark counts wallet providers such as Breez, Xverse, and Cake among the teams building on the same rails, and Tether chief Paolo Ardoino has praised the protocol as a route to programmable Bitcoin over Lightning.

Polymarket’s boom over the years

Timing matters for a company in a growth phase. 

Founded in 2020, Polymarket rose to prominence during the 2024 U.S. presidential election and has added Chainlink oracles, earnings markets, and a fresh contest with regulated rival Kalshi. 

Faster, cheaper funding lowers the barrier for the Bitcoin holders who make up a large share of the crypto audience, and it hands Polymarket a fresh answer to a rival that has pressed it on volume.

This post Polymarket Turns On Instant Bitcoin Deposits Via Lightning Network, Powered by Spark first appeared on Bitcoin Magazine and is written by Micah Zimmerman.

Bitcoin Magazine

Fidelity Outlines 5 Factors That Could End the Bitcoin and Crypto Winter

Bitcoin is trading below $60,000 as of late June 2026, roughly 53% off its October 2025 all-time high above $126,200. A short-lived rally from March to May gave bulls a brief reason for optimism, but prices have since retreated. 

According to a new report from Fidelity, the current downturn has the hallmarks of a crypto winter — and history points to five factors that could bring it to an end.

Fidelity notes that bitcoin has formed bull market tops and bottoms at roughly four-year intervals since 2011. With the last bear market bottom arriving in November 2022, the pattern suggests a potential floor around November 2026 — if the cycle holds. The debate over whether bitcoin’s 4-year cycle is intact remains active, and some analysts argue the bear market is nearly finished while others are less certain.

Bitcoin’s four-year cycle

The cycle’s engine, Fidelity explains, is bitcoin’s halving mechanism — a built-in rule that cuts mining rewards in half every four years, reducing new supply entering circulation. The most recent halving in April 2024 dropped block rewards to 3.125 BTC.

 If demand holds steady or grows against a shrinking supply, prices can rise. The firm cautions, though, that the cycles have varied in length and should be used for big-picture analysis rather than precise trade timing.

Regulation

Clear rules have preceded previous bull markets, according to Fidelity. The SEC’s approval of spot bitcoin ETPs in January 2024 was a defining moment, helping push bitcoin to new highs. Now, the firm flags the CLARITY Act as the next major legislative development to watch.

The bill, which would divide digital asset oversight between the SEC and CFTC and give the industry a clear legal framework, passed the House in 2025 and has since advanced through the Senate Banking Committee. A hearing is scheduled for July 17, with the crypto industry watching closely. 

If it becomes law, Fidelity argues it could unlock domestic activity that has been held back by legal uncertainty.

Federal Reserve policy

Fidelity points to a consistent, if correlational, relationship between interest rate cuts and crypto price gains. Looser monetary conditions make borrowing cheaper and investors more comfortable taking on risk — and crypto has historically benefitted. The inverse has also been true when rates rise.

With inflation still a concern in mid-2026, the Fed’s path remains unclear. The firm notes that any price appreciation could come well before an official rate cut announcement, as markets tend to move in anticipation.

A breakout use case

NFTs and memecoins turbocharged the 2019–2021 bull run, according to Fidelity — a wave of investor interest few saw coming. The firm identifies three trends drawing the most attention in 2026: real-world asset tokenization, AI-related crypto infrastructure, and stablecoins, which have seen rapid adoption following the passage of the GENIUS Act in 2025. But Fidelity also leaves the door open to something no one is watching yet — historically, the biggest catalysts have been surprises.

Institutional adoption

Fidelity acknowledges this is no longer a fresh narrative. When public companies first disclosed crypto holdings in 2020, it sparked a new story that helped run prices to then-record highs. The establishment of the U.S. Strategic Bitcoin Reserve in March 2025 had a similar effect, helping push bitcoin above $126,000. But sustained institutional adoption throughout 2026 has not translated into a new bull market.

Still, Fidelity argues an unforeseen move could change the calculus. A Magnificent Seven company announcing a major bitcoin position — something not seen since Tesla’s 2021 purchase, most of which it later sold — could create a fresh narrative. So could a global crisis driving institutions toward bitcoin as a hedge, something that has not materialized during the ongoing conflict in Iran.

This post Fidelity Outlines 5 Factors That Could End the Bitcoin and Crypto Winter first appeared on Bitcoin Magazine and is written by Micah Zimmerman.