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1. go-opera-testing.md go-opera-testing.md

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   Replacing go-ethereum/lachesis-base with custom branch for development:

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   ```

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   go mod edit -replace github.com/ethereum/go-ethereum=github.com/hkalina/go-ethereum@86abe1a01dc15bb3282628cc39eb7b451e6c1113

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   go mod edit -replace github.com/Fantom-foundation/lachesis-base=github.com/hkalina/lachesis-base@01569740d42de172b09866c8bb45e9aabd8b0235

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   GOPRIVATE=github.com/Fantom-foundation go mod tidy