In BITA’s case, if bitcoin rallies, the ETF benefits from its IBIT holdings, but the gains are capped by having to pay out on the calls. If BTC holds steady or falls, the call-writing premium offsets some of the decline. In effect, investors give up potential gains for a steadier stream of income.

“By deploying a covered-call strategy on its Bitcoin-linked exposure, the fund seeks to convert Bitcoin’s historically high volatility into a recurring income stream with a target of +15% annual yield while retaining around 70% participation in its underlying capital appreciation potential,” Tagus Capital said in an email.

The strategy could also affect the broader market, which is influenced by demand-supply balance of options. Selling call options systematically, or overwriting, suppresses bitcoin’s implied volatility. Bitcoin’s 30-day implied volatility has been dropping since 2022, and call overwriting is a major reason. (Check Daily Signal, below)

Now BlackRock is institutionalizing that at scale. More systematic selling of options means more premium supply hitting the market, and more downward pressure on volatility.

Bitcoin, already less wild than it used to be, is about to get a little tamer still.

As for price action, bitcoin’s recent bounce to over $66,000 from under $59,000 still lacks institutional support. The spot ETFs listed in the U.S. registered an outflow of $64 million on Monday, taking the month’s withdrawals to $2.10 billion.

A sustained move higher requires a dramatic shift. Stay alert!

Read more: For analysis of today’s activity in altcoins and derivatives, see Crypto Markets Today . For a comprehensive list of events this week, see CoinDesk’s “Crypto Week Ahead.”

U.S. and Iran sign preliminary deal, but its terms remain secret (New York Times): President Donald Trump and Iran’s lead negotiator signed an agreement that is expected to open the Strait of Hormuz. Specific terms of the deal have not been released, and Israel’s Prime Minister Benjamin Netanyahu appears not to be fully on board.

Stocks have even more room to fly if Hormuz reopens (WSJ): Investors just shook loose one of the biggest drags on market sentiment since late February. Oil prices fell, bonds rallied and the Dow Jones Industrial Average closed at a record on Monday after Trump announced a deal to end the war with Iran and reopen the Strait of Hormuz, the world’s most vital artery for energy shipments.

Bank of Japan hikes rates to 1%, highest since 1995, as yen and inflation worries take hold (CNBC): The BOJ said the decision to raise rates by 25 basis points was split 7-1, with board member Toichiro Asada dissenting and advocating for a hold. Japan has been struggling with a weak yen and inflation that has started to creep up, partly due to the Iran war.

Ukraine aims to align banks, insurers with EU rules by 2028, central banker says (Reuters): Ukraine is accelerating reforms to align its banking and insurance sectors with EU standards by ​2028 despite wartime challenges, to buttress investor confidence and deepen economic integration with Europe, its central bank governor said.

The chart shows daily swings in bitcoin’s 30-day implied, or expected, volatility index since late 2022.

The index has been mostly declining, as evident from that yellow downward sloping trendline. This shows a growing maturity of the bitcoin market, driven by institutionalization and systematic call selling by investors to pocket extra yield on top of their spot market holdings.