F2Pool’s Alleged Censorship of OFAC-Sanctioned Bitcoin Transactions Raises Concerns

Bitcoin’s core attraction lies in its resistance to censorship and immunity from arbitrary regulations. It operates under the principle that anyone able to cover network fees can engage in transactions without requiring permission. However, a recent report has raised questions about whether F2Pool, a major Bitcoin mining pool, has filtered transactions based on sanctions imposed by the US Office of Foreign Assets Control (OFAC).

Asian-Based Bitcoin Mining Pool Complies with US Sanctions

According to 0xB10C, a pseudonymous Bitcoin developer known for the mining pool-observer tool found six Bitcoin transactions from OFAC-sanctioned addresses not included in blocks.. It’s worth noting that two transactions not included in ViaBTC and Foundry USA pool blocks were considered false positives and not intentionally filtered.

In contrast, the absence of four OFAC-sanctioned transactions from F2Pool blocks suggests intentional filtering. This development raises questions about why F2Pool, an Asian-based mining pool, has taken this step.

Impact on Bitcoin Network

While the Bitcoin network continues to function without disruption, the actions of a single mining pool filtering transactions do not compromise its overall censorship resistance. However, F2Pool is the third-largest Bitcoin mining pool, accounting for 13.7% of all mined blocks in the past year. This means that in a scenario where F2Pool actively filters sanctioned transactions, approximately one in seven BTC blocks could potentially be mined under censorship conditions.

F2Pool’s Response

F2Pool’s co-founder, Chun Wang, announced that the mining pool would deactivate the “transaction filtering patch.” Wang stated that the filter would remain inactive “until the community reaches a more comprehensive consensus on this topic.” This acknowledgment confirms that F2Pool had deliberately censored transactions sanctioned by OFAC, sparking concerns about the possibility of a recurrence in the future.


1. What is F2Pool, and why is it significant in the Bitcoin network?

F2Pool is one of the largest Bitcoin mining pools globally, responsible for mining a significant portion of Bitcoin blocks. Its significance lies in its role in securing and processing Bitcoin transactions.

2. What are OFAC sanctions, and why are they relevant to Bitcoin transactions?

OFAC sanctions are imposed by the US government to restrict financial transactions with specific individuals, entities, or countries. They are relevant to Bitcoin transactions because some mining pools, like F2Pool, have been accused of filtering out transactions involving sanctioned addresses.

3. How does Bitcoin maintain its resistance to censorship?

Bitcoin’s resistance to censorship is maintained through its decentralised nature, where transactions are processed by a network of miners who follow the consensus rules. This prevents any single entity or authority from controlling or censoring transactions.

Why is it concerning that F2Pool filtered OFAC-sanctioned transactions?

It is concerning because it raises questions about the principles of censorship resistance within the Bitcoin network. While F2Pool’s actions did not disrupt the network, it highlights the potential for centralized control in mining pools, which goes against Bitcoin’s ethos.

5. What is the potential impact of F2Pool’s censorship on Bitcoin’s censorship resistance?

While F2Pool’s actions alone did not compromise Bitcoin’s overall censorship resistance, it underscores the need for vigilance within the community to prevent similar incidents in the future and maintain the network’s integrity.

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About Victor Dsouza

Victor Dsouza is Crypto Journalist. He is keen to write about crypto tokens, crypto presale, you can follow him on twitter and LinkedIn.

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