Transaction compliance with sanctions is provided by an open source software module called MEV Boost. The module checks transactions and offers validators only those blocks, all transactions in which meet the requirements of the regulators. The module works with several organizations that verify the legitimacy of transactions.
Back in November last year, the percentage of Ethereum blocks that passed under the OFAC norms reached 80%. This was due, among other things, to blocking the addresses of the popular Tornado Cash mixer. However, later the figure began to decline.
In February, the percentage of blocks in the Ethereum network that comply with OFAC restrictions dropped to 47%.
Source: Bits

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