Google’s Quantum AI team said in a Tuesday whitepaper and blog post that Bitcoin and Ethereum cryptography tied to ECDLP-256 could be broken with fewer than 500,000 physical qubits and about 1,200 logical qubits. The paper also models a live Bitcoin attack that could steal coins mid-transaction in around 9 minutes, implying a 41% chance of beating Bitcoin’s 10-minute block time.

Square, a subsidiary of Block, Inc., will begin automatically enabling bitcoin payments for millions of eligible U.S. merchants starting March 30, 2026. Block's Bitcoin Product Lead Miles Suter said qualifying domestic sellers will have BTC acceptance turned on by default, while settlements will be delivered in U.S. dollars to reduce volatility exposure.

Bitcoin (BTC) traded around $67,000 after a 24-hour drop to $69,329, as institutional demand softened and rising real yields weighed on risk assets. Analysts highlighted $65,000 as key support with $69,000 as a recovery trigger, while resistance is clustered near $72,000 and upside targets extend toward $76,000 before month-end. The Bitcoin Rainbow Chart still places BTC in the “BUY!” band ($56,000–$75,000), though near-term direction depends on support holding and ETF outflows stabilizing.

Google Research said a new estimate shows the quantum resources needed to break the cryptography used by many blockchains have dropped by about 20x, potentially bringing the risk closer than earlier projections. The team argued faster execution could enable "on-spend" attacks against Bitcoin transactions during the roughly 10-minute block window, and pointed to a 2029 goal for migrating to post-quantum cryptography.

On March 30, 2026, Senators Cynthia Lummis and Bill Cassidy filed the "Mined in America Act" to expand US-based Bitcoin mining hardware production and reduce reliance on China-linked equipment. The proposal would create a voluntary Commerce Department certification tied to access to existing federal energy programs and would codify a Treasury-run Strategic Bitcoin Reserve using seized assets, with no new taxpayer funding.

An analyst says Bitcoin may be nearing its final corrective phase after a bearish-flag breakdown, pointing to a historical signal on the three-day chart. The view centers on the 50- and 200-period SMA crossover, which previously coincided with major-cycle lows since 2014, as BTC trades around $67,000-$68,000 after a weekly close near $66,000.

Nakamoto Inc. (Nasdaq: NAKA) said it sold about 284 BTC for $20 million in March at a price below its average acquisition cost. The firm plans to deploy the proceeds into its core businesses and to restore working capital after recent mergers. In 2025, it reported $166.2 million in fair-value losses on crypto holdings and a net loss of $52.2 million.

Bitcoin's network hashrate fell nearly 6% after a US-Israel joint operation in Iran on February 28, with Iran estimated to represent 6–8% of global mining capacity. In March 2026, several major miners accelerated a pivot toward AI data centers, including MARA Holdings' sale of 15,133 BTC for about $1.1 billion and Core Scientific's $1 billion debt financing from JPMorgan and Morgan Stanley. Other firms moved the opposite way, with American Bitcoin disclosing holdings of 7,000 BTC after its September 2025 Nasdaq debut.