Bitcoin Core has released version 31.0, improving Mempool logic and enhancing the privacy of transaction broadcasting.

April 21 — Xinhua News Agency: White House Press Secretary Levitt told Fox News in a Tuesday evening (April 20) interview that the U.S. and Iran are on the verge of an agreement, adding the U.S. has never been closer to a truly good deal. Levitt did not share details about the current state of negotiations. He noted that if no deal is struck, President Trump has multiple options and will not hesitate to use them — past actions show Trump’s threats are not empty.

April 21 — Iran’s Ministry of Foreign Affairs on Thursday released a statement strongly condemning a U.S. military attack on an Iranian cargo ship in the Gulf of Oman on April 19, demanding the immediate release of the detained vessel and its crew. The statement labeled the attack and crew detention as acts of piracy and terrorism, calling them a blatant violation of the U.S.-Iran ceasefire agreement and amounting to aggression against Iran. It warned the U.S. the attack could have serious, dangerous regional consequences, adding: “The U.S. bears full responsibility for any further escalation of the regional situation.”

April 21st — Per OnchainLens analytics, trader Loracle has opened a 5x leveraged short position on HYPE (currently valued at $11 million) and is still adding to the position. Loracle also holds a long position in 374.66 PAXG gold tokens.

On April 21, blockchain analytics firm Nansen announced a major upgrade to its on-chain data API, launching a pay-as-you-go model powered by the x402 protocol and PayAI infrastructure. Users can now instantly access wallet profiles, token flows, and smart money signals via small USDC payments—no monthly subscriptions, forced approvals, or long-term contracts required. Nansen noted traditional subscription models are highly unfriendly to AI agents and developers: AI agents often need intermittent queries followed by idle periods; developers face uncertain future needs during prototype testing; and researchers get locked into unnecessary fixed costs. The new solution is built around the open payment standard x402: When a user requests a paid endpoint, the server returns a 402 "Payment Required" status code with the amount, currency, and blockchain details. The client completes an on-chain USDC transaction, provides the receipt, and unlocks the data. The full "request-invoice-pay

On April 21, per EmberCN monitoring, the Arbitrum Security Council has frozen 30,766 ETH (valued at $70.97 million) stolen from KelpDAO—but the hacker still holds 75,700 ETH on the Ethereum blockchain, worth $175 million.