Tether freezes 131 ISIS-K-linked wallets

• Tether froze USDT held in 131 TRON wallets after the US Treasury added the addresses to its ISIS-K sanctions list.
• Chainalysis said the sanctioned wallets received more than US$1.4 million and sent over US$880,000 since 2023.
• The action requires crypto service providers to update sanctions screening and transaction monitoring systems.

Tether froze USDT linked to 131 TRON wallets after the United States Treasury's Office of Foreign Assets Control added 134 cryptocurrency wallet identifiers connected to ISIS-K to its sanctions list.

The July 1 sanctions update included 131 TRON wallets and three Monero (CRYPTO:XMR) wallets, with Chainalysis reporting that the sanctioned TRON addresses had received more than US$1.4 million and transferred over US$880,000 since 2023.

“Tether has frozen the balances on all 131 TRON addresses,” said Chainalysis.

Chainalysis said several sanctioned wallets interacted with mainstream crypto services and Syria-based cryptocurrency exchangers, while adding that ISIS-K's al-Azaim Media Foundation has previously sought cryptocurrency donations using TRON (CRYPTO:TRX), Monero and Bitcoin (CRYPTO:BTC) addresses.

The action expands Tether's enforcement activity after the company said its T3 Financial Crime Unit had frozen more than US$450 million in suspected illicit assets since launching in 2024, while Tether is privately held and does not have a publicly traded share price.

Earlier this year, Tether also froze more than US$514 million across 370 wallet addresses, with BlockSec reporting the company blacklisted 4,163 addresses during 2025 and froze about US$1.26 billion across the Ethereum (CRYPTO:ETH) and TRON blockchains.

Chainalysis said the latest sanctions require virtual asset service providers and financial institutions to update compliance systems so they can identify transactions involving the newly designated ISIS-K wallet addresses and related networks.

At the time of reporting, Monero price was $307.25.