# Eth2 Interop in Review

DevFeed: [Eth2 Interop in Review](<https://devfeed.tech/articles/eth2-interop-in-review-16861.md>)

Original publisher: [Read original article](<https://blog.ethereum.org/en/2019/09/19/eth2-interop-in-review>)

Author: Danny Ryan

Published: 2019-09-19T00:00:00Z

Content type: article

Language: en

Sources: [Ethereum Foundation Blog](<https://devfeed.tech/sources/ethereum-foundation-blog.md>)

Topics: [Ethereum](<https://devfeed.tech/topics/ethereum.md>), [Blockchain](<https://devfeed.tech/topics/blockchain.md>), [interoperability](<https://devfeed.tech/topics/interoperability.md>), [Protocol (disambiguation)](<https://devfeed.tech/topics/protocol.md>), [Development](<https://devfeed.tech/topics/development.md>)

Tags: [blockchain](<https://devfeed.tech/tags/blockchain.md>), [engineering](<https://devfeed.tech/tags/engineering.md>), [ethereum](<https://devfeed.tech/tags/ethereum.md>), [interoperability](<https://devfeed.tech/tags/interoperability.md>), [protocol](<https://devfeed.tech/tags/protocol.md>), [research-development](<https://devfeed.tech/tags/research-development.md>), [specifications](<https://devfeed.tech/tags/specifications.md>)

## AI overview

The article reviews the Eth2 Interop Lock-in, where seven of eight actively developed Eth2 clients reached multi-client testnets. It explains the development path from research and specifications to client implementation, testing, and interoperability work following the Phase 0 specification freeze.

## Source excerpt

Last week, seven of the eight Eth2 clients under active development succeeded in marking the major milestone of moving from single-client to multi-client testnets at the "Interop Lock-in". With this exciting success in Eth2 development, we wanted to reflect on how this point was reached and on what it means...