Polymarket acquires Brahma to scale blockchain trading infrastructure

"Building reliable infrastructure across blockchain networks and traditional financial rails is hard — there are no shortcuts,” said Polymarket CEO Shayne Coplan.

source https://www.coindesk.com/business/2026/03/18/polymarket-acquires-defi-brahma-to-build-reliable-financial-blockchain-infrastructure

Kalshi co-founder fights back against Arizona’s ‘overstep’ in what a lawyer calls a federal-state turf war

Arizona has filed 20 criminal counts against Kalshi, a prediction market platform, accusing it of operating an illegal gambling business and offering election wagering in the state.

source https://www.coindesk.com/policy/2026/03/18/kalshi-co-founder-fights-back-against-arizona-s-overstep-in-what-a-lawyer-calls-a-federal-state-turf-war

Senator Tim Scott says market structure negotiations are advancing

The South Carolina Republican said he might see a draft of stablecoin yield language as soon as this week, and other issues continue to be negotiated.

source https://www.coindesk.com/policy/2026/03/17/senator-tim-scott-says-market-structure-negotiations-are-advancing

U.S. SEC issues first-ever definitions for what crypto assets are securities

The U.S. Securities and Exchange Commission shared the informal guidance it'll use to classify crypto securities alongside its sister agency overseeing commodities.

source https://www.coindesk.com/policy/2026/03/17/u-s-sec-issues-first-ever-definitions-for-what-crypto-assets-are-securities

Mastercard's $1.8 billion deal 'a clear answer' to a massive shift in the global payment war

Analysts say the $1.8 billion acquisition shows stablecoins are moving from niche use to global settlement rails.

source https://www.coindesk.com/business/2026/03/17/mastercard-s-usd1-8-billion-deal-a-clear-answer-to-a-massive-shift-in-the-global-payment-war

Man accuses wife of using CCTV cameras to steal $172 million bitcoin from his hardware wallet

The alleged theft of 2,323 bitcoin has triggered a High Court dispute testing how English property law applies to digital assets.

source https://www.coindesk.com/business/2026/03/16/man-accuses-wife-of-using-cctv-cameras-to-steal-usd172-million-bitcoin-from-his-hardware-wallet

OpenSea delays highly anticipated token launch, citing challenging crypto market conditions

The platform will end its rewards waves, offer optional fee refunds for certain traders and introduce 0% token trading fees for 60 days starting March 31 as it promotes its revamped marketplace.

source https://www.coindesk.com/business/2026/03/16/opensea-delays-highly-anticipated-token-launch-citing-challenging-crypto-market-conditions