Major U.S. exchanges including Nasdaq, Cboe, and CME are raising concerns over SEC proposals that could permit crypto platforms to offer tokenized stocks under reduced regulatory oversight. The World Federation of Exchanges submitted a letter on November 21 warning that broad exemptions may create competitive imbalances and weaken investor protections.

Bitcoin's network computing power has reached unprecedented levels above one zettahash, yet miner revenue per petahash has collapsed to all-time lows near $34.20. Mining difficulty dropped approximately 2% at block height 925,344 on November 27 to 149.30 trillion, marking the second consecutive monthly decline.

A malicious browser extension has been extracting cryptocurrency from Solana traders by embedding unauthorized transfers into transactions, cybersecurity firm Socket disclosed Tuesday. The extension, marketed as a trading tool, attaches a minimum fee of 0.0013 SOL or 0.05% per swap while concealing the activity from wallet confirmation screens. The tool remained available on the Chrome Web Store since June 18, 2024, with 15 installations recorded at the time of discovery.

Australia has introduced the Digital Assets Framework Bill 2025, requiring cryptocurrency exchanges and custody providers to obtain an Australian Financial Services License (AFSL). The legislation subjects digital-asset platforms to the same regulatory standards as traditional financial institutions, focusing on client-asset protection rather than blockchain technology itself.

Upbit, South Korea's largest cryptocurrency exchange, disclosed Thursday that unauthorized withdrawals drained approximately $36 million worth of assets from its Solana hot wallet. The breach affected multiple tokens including BONK, JTO, SONIC, PENGU, and USDC. Exchange CEO Oh Kyung-seok confirmed full reimbursement for affected customers.

Bitcoin has reclaimed a four-year trendline as support after previously encountering it as resistance. Three technical signals on weekly timeframes—trendline support, a resistance zone near $91,000, and a hidden bullish divergence—suggest the current market cycle may continue, according to multiple analysts.

The UK's Her Majesty's Revenue and Customs has introduced a 'No Gain No Loss' tax framework for decentralized finance activities. The proposal would exempt on-chain DeFi deposits from capital gains taxation, according to Aave founder Stani Kulechov. The policy aims to align tax rules with blockchain transaction mechanics and streamline compliance for users engaged in lending and staking.

Bitcoin exchange order books now show reduced selling activity, with Coinbase premium recovering after a prolonged decline. Futures funding rates have turned negative, signaling decreased imbalance between short positions and spot market demand. The shift follows weeks of sustained outflows that pressured exchange order books.