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Nimbus passes phase 0, Altair, and Merge consensus spec tests in minimal and mainnet presets.

How to run Geth

Clone Geth: git clone --branch merge-interop-spec https://github.com/MariusVanDerWijden/go-ethereum.git ~/execution-clients/go-ethereum
Build Geth and Geth with make geth
Run scripts/run-catalyst.sh to run Geth. It listens on HTTP port 8545 and websockets port 8546.
At the Geth console, run the miner.start() command.

Verify that Nimbus runs through the merge vectors

Wait for Geth to mine through to the total transition difficulty
Run ./env.sh nim c -r tests/test_merge_vectors.nim. It should show output akin to:

[Suite] Merge test vectors
  [OK] preparePayload, getPayload, executePayload, consensusValidated, and forkchoiceUpdated
{"code":5,"message":"unknown payload"}
  [OK] getPayload unknown payload

How to run Nimbus local testnet with Geth

Check out branch amphora-merge-interop
Run (and keep running) ./scripts/run-catalyst.sh.
Run ./scripts/launch_local_testnet.sh --preset minimal --nodes 4 --disable-htop --stop-at-epoch 7 -- --verify-finalization --discv5:no

This creates a 4 node local testnet with 128 validators.

The Nimbus console output will be similar to

Wrote local_testnet_data/genesis.ssz
Wrote local_testnet_data/bootstrap_nodes.txt
Wrote local_testnet_data/config.yaml:
PRESET_BASE: minimal
MIN_GENESIS_ACTIVE_VALIDATOR_COUNT: 128
MIN_GENESIS_TIME: 0
GENESIS_DELAY: 10
DEPOSIT_CONTRACT_ADDRESS: 0x0000000000000000000000000000000000000000
ETH1_FOLLOW_DISTANCE: 1
ALTAIR_FORK_EPOCH: 1
MERGE_FORK_EPOCH: 2

Meanwhile, Nimbus is interacting with Geth in preparing, getting, executing, and marking as valid execution payloads: