STEEL Team
The STEEL team is a team funded the Ethereum Foundation (EF) which develops and maintains the execution specs, and execution spec tests.
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Ethereum Execution Layer Specification (EELS)
The EELS project aims to be a faithful, up to date, highly readable, implementation of the Ethereum execution layer. It functions as a standalone client, with the intention to act as a common point of reference for the efficiency focused production clients such as geth, reth, besu, nethermind, etc. The client is not intended to be used in a production environment, and code comprehensibility is the primary metric driving our development.
Ethereum Execution Specification Tests (EEST)
The EEST project is a sibling initiative, developed for production execution clients so that they have a standardized set of tests in a common format (JSON), that allow the EF to detect differences and potential regressions between clients. Production clients download, consume (translate JSON objects into ethereum transaction blocks), execute, and verify (using block hashes) the results. Clients must pass all tests up to and including the current chain fork to be considered in spec. Production client teams work with us to develop new tests.