Enseignante et ingénieure IT, Lydie découvre le Bitcoin en 2022 et plonge dans l’univers des cryptomonnaies. Elle vulgarise des sujets complexes, décrypte les enjeux du Web3 et défend une vision d’un futur numérique ouvert, inclusif et décentralisé.
Bitcoin is approaching a major derivatives expiration. On Friday, September 25, about 182,000 BTC in options, representing $15.6 billion in notional value, will expire on Deribit. Calls dominate with 106,200 BTC, compared to 75,900 BTC in puts. The settlement occurs while Bitcoin was trading around $85,000 at Deribit's snapshot, significantly above the "max pain" level set at $76,000.
Donald Trump Jr. finds himself at the center of a new offensive in the U.S. Senate. Republican John Curtis, elected from Utah, is asking the judiciary committee to investigate the potential use of family ties to the presidency for financial purposes. He also wants Donald Trump Jr. and Hunter Biden to be subpoenaed to testify. For Donald Trump’s son, the senator notably cites his crypto activities, his links with predictive markets, and certain benefits received from foreign personalities. At this stage, it is a request for investigation, not a conclusion about possible offenses.
The crypto market briefly reclaimed a $3 trillion capitalization on Tuesday, driven by Bitcoin and several major altcoins. BTC was trading around $86,000, up about 4.5% in 24 hours, while DOGE gained nearly 11%, XRP 5.7%, and Solana 3.6%. Behind the rebound, another figure stands out: over $920 million in short positions were liquidated on Monday. American Bitcoin ETFs also attracted nearly $1 billion in a single session.
Bitcoin opens a new week above 80,000 dollars after briefly plunging towards 75,000 dollars during the Federal Reserve's decision. The economic calendar seems lighter, but three appointments stand out: a series of interventions from Fed officials, the first US PMIs for September on Wednesday, and the meeting between Donald Trump and Xi Jinping on Thursday. Last week, the US central bank raised its rates by 25 basis points, for the first time since July 2023. The Bitcoin market must now digest this return of monetary tightening.
Using Ethereum is much cheaper than in the spring. The average cost of an ETH transfer fell to around 0.095 dollars, compared to a peak of 0.72 dollars on April 21, according to Santiment data. The drop therefore exceeds 85%. It comes as demand on the mainnet has calmed, but also after several months of technical improvements. Fusaka, blobs, and Layer 2 have given more capacity to the crypto network.
The number is impressive, but it is an estimate. 92,272 people are believed to hold at least 1 million dollars in Bitcoin, according to Henley & Partners' Crypto Wealth Report 2026. In total, the firm counts 135,694 millionaires in digital assets. Bitcoin thus represents nearly 68% of this group. The calculation is stopped as of August 31, 2026, while BTC was still about 38% below its record of October 2025.
Bull Bitcoin and Paymium did not obtain the immediate suspension of DAC8 in France. The Council of State rejected their urgent motion against the French decree that organizes the collection and transmission of data on crypto-asset transactions. However, the court did not rule on the merits of the case. The appeal seeking the annulment of decree no. 2025-1276 continues.
Revolut faces new pressure following a data leak revealed a few days earlier. A group calling itself iamnotavillain now demands 6,000 XMR, about 3 million dollars, and threatens to sell stolen information if the fintech does not pay. The attackers set a 24-hour deadline. About 680 clients, including several major crypto holders, are affected. Revolut states it has not received any request directly.
CoinEx will disappear on December 22, 2026, exactly nine years after its launch. The exchange started reducing its services on September 15 and now asks its users to withdraw their funds. Spot trading will stop on September 29. CoinEx explains its decision by the prolonged weakness of the crypto market, the drop in volumes and liquidity, as well as compliance costs that have become too burdensome.
Solana has just activated on its mainnet an upgrade awaited for several months. The maximum size of a transaction increases from 1,232 to 4,096 bytes, or 3.3 times more space. The new v1 format has been active since the beginning of epoch 1,035 on September 15. For the crypto ecosystem, the change mainly targets operations too large to fit until now in a single transaction: zero-knowledge proofs, multisignatures, and new onchain signature systems.
The digital ruble recorded 87,000 account openings in ten days after its nationwide rollout on September 1. Over 50,000 transactions have also been made, according to Elvira Nabiullina, governor of the Bank of Russia. This represents about 8,700 new accounts per day. The project now coexists with the Russian crypto market, even though it is not a cryptocurrency: the digital ruble is issued directly by the central bank.
North Korea is expanding its infiltration system of American companies. According to an NBC investigation, IT workers based notably in Iran and Lebanon are recruited to attend interviews on behalf of North Korean operators. Some reportedly received 500 dollars per month in crypto to play the "interview associates" role. Once the contract is secured, the position can be taken over by a worker linked to Pyongyang. American authorities had already documented the increasing use of third parties to bypass recruitment controls.
OpenAI seeks a legal answer to an unusual question: can several AI giants jointly decide to slow down the development of their models without violating U.S. antitrust law? According to WIRED, the company has questioned members of Congress in recent weeks. The move follows a call from its chief scientist, Jakub Pachocki, for coordinated slowdowns when safeguards no longer keep pace with model capabilities. OpenAI has not announced a pause. It first wants to know if coordination with its competitors would be legal.
Bitwise will close BWOW, its Dogecoin ETF launched at the end of November 2025. The fund held only about 688,000 dollars in net assets as of September 9, according to data cited by Cointelegraph. Its last session on the NYSE Arca is scheduled for October 14, then the remaining investors will be reimbursed in cash around October 22. Less than eleven months were therefore enough to end this crypto experiment.
Iran loosens part of its currency controls and allows more room for crypto in its international exchanges. According to the Financial Times, exporters can now use their foreign revenues to directly finance imports and resort to Bitcoin or USDT for certain cross-border settlements. Nearly 9.9 billion dollars of crypto activity had already been attributed to Iran in 2025. The Iranian Central Bank has not publicly commented on these new rules.