Brent crude oil jumped as much as 9% on July 13, peaking near $83 per barrel, after President Trump announced the reinstatement of a US naval blockade targeting Iranian shipping in the Strait of Hormuz. That’s the highest level in a month, and the kind of single-day move that sends energy traders scrambling for their Bloomberg terminals and crypto markets reaching for the antacids.

The blockade targets Iranian ports and oil terminals while ostensibly allowing “fair use” passage for non-Iranian vessels. Trump also proposed a 20% toll on cargo transiting the strait, a waterway responsible for roughly one-fifth of all seaborne oil trade globally.

A blockade, lifted, then reinstated

This isn’t the first time the strait has been weaponized in 2026. The broader US-Iran conflict traces back to February, and the waterway has experienced overlapping blockades and restrictions throughout the year.

A previous US blockade of Iranian ports was lifted in mid-June after a short-lived agreement between Washington and Tehran to reopen the strait. That deal clearly didn’t stick. Iranian assertions of control over the waterway appear to have triggered the July 13 reinstatement, escalating military tensions between the two nations back to a rolling boil.

Oil markets have been on a wild ride all year as a result. Prices spiked above $120 per barrel during earlier peak tensions, then retreated to the $70 to $80 range during brief windows of de-escalation. The latest move back toward $83 suggests traders are pricing in the very real possibility that this round of brinkmanship doesn’t resolve quickly.

Why crypto traders should care about oil tankers

Higher oil prices feed directly into inflation expectations. When crude surges 9% in a day, bond markets reprice, the dollar reacts, and risk appetite across every asset class shifts. Bitcoin and Ethereum have increasingly traded as macro-sensitive assets since 2022, and a sustained move in energy costs changes the calculus for central banks that crypto investors have spent the year obsessing over.

There’s also a more direct connection. Bitcoin mining is energy-intensive, and while most large-scale operations have locked in power contracts, sustained higher energy costs at the margin affect profitability calculations and, by extension, miner behavior. When miners face cost pressure, hash rate dynamics can shift, and sell pressure from mining operations tends to increase.

What investors should watch from here

The 9% single-day move tells us something important about market positioning. Traders had apparently gotten comfortable with the de-escalation narrative after the June agreement, and the snap-back suggests the market was caught underweight on geopolitical risk.

The $83 level for Brent is technically significant but still well below the $120-plus peaks seen earlier in the 2026 conflict cycle. If Iranian retaliation targets non-Iranian shipping or the proposed 20% toll gets formalized, prices could push meaningfully higher.

For crypto-specific implications, watch the dollar index and Treasury yields in the coming days. A risk-off move that strengthens the dollar and pushes yields higher would likely create near-term pressure on Bitcoin and altcoins. Conversely, if markets interpret the oil spike as an inflation hedge scenario, Bitcoin’s “digital gold” narrative could get a fresh test.