Recently, I noticed one thing: when we talk about Ethereum decentralization, we often forget the most basic question — can the network even withstand if someone wants to shut it down? This is not a philosophical question but a very practical problem that Vitalik Buterin raised in early March.

He suggested thinking of Ethereum not just as a financial network but as part of an ecosystem of 'sanctuary technologies' — open systems that operate even under pressure, even when governments or corporations try to block them. It sounds ambitious, but if you think about it, it’s a very concrete engineering challenge.

Here’s the core of the problem. As block creation becomes more specialized, the authority to decide which transactions to include in a block concentrates in the hands of a small number of block builders. Theoretically, any of them could refuse to include certain transactions — for example, from sanctioned addresses. This is no longer just theory. Plus, there are classic issues like sandwich attacks and front-running — when other participants see your transaction in the mempool and deliberately insert their transactions before or after yours to profit from the price difference.

To address these issues, Ethereum is developing several technical approaches. FOCIL is a consensus-level mechanism that guarantees validators must include certain transactions, even if the block builder does not want to. This is already included in the Hegotá upgrade specification, expected in the second half of 2026.

But FOCIL only solves half the problem. The remaining question is: what if the entire market already knows about your transaction before it gets into the block? For this, developers are working on a cryptographic mempool — a solution where transactions are encrypted when sent and only decrypted after inclusion in a block. Ethereum Foundation researchers and the EIP-8105 team have collaborated on the LUCID proposal, which is expected to become part of the same upgrade.

Together, these solutions are called the 'Holy Trinity of Censorship Resistance.' The idea is simple but radical: instead of relying on the good will of network participants, protection should be built directly into the protocol. As Vitalik says, the hammer should not stop working if its manufacturer goes bankrupt or decides to refuse service.

This brings Ethereum back to its roots — the idea that true decentralization is not a default state but the result of persistent engineering effort. When ordinary users can safely send open transactions without fear of being blocked or reordered, the network will truly pass Vitalik’s exit test. That is the essence of sanctuary technology.