Eth2 Monitor

Eth2 Monitor serves a few purposes:

• monitors the attestation inclusion distance,
• monitors and alerts slashing events,

Installation

Binaries

You can use pre-built binaries from the latest published release.

Containers

You can use pre-built containers from Github public container registry.

docker pull ghcr.io/stakefish/eth2-monitor

Sources

If you choose to build from sources, use this command:

make

You will find the executable in bin/eth2-monitor.

It's recommended to use the latest Go version.

Install Beacon Node

eth2-monitor relies on Beacon Node API to query the Beacon Chain and therefore requires a running Beacon Node (any that implements the Beacon API spec should do, e.g. Prysm, Lighthouse, etc.).

Usage

Most of the commands (except for slashings) require you to provide public keys of validators you want to monitor.

You can specify the validator public keys in the command line using -k option. You can use -k multiple times to specify more than one keys. Example:

eth2-monitor cmd -k a1daf19d432507b70fd83214aba105be66c81307d22b3d242cdecaaca5528c1b1e5e3cac5ef7f9e7456e9d202d0ec887

You can use a file if you have a bunch of keys. The format is very simple: one public key per line. Example:

echo a1daf19d432507b70fd83214aba105be66c81307d22b3d242cdecaaca5528c1b1e5e3cac5ef7f9e7456e9d202d0ec887 > keys.txt
eth2-monitor cmd keys.txt

All public keys are hex-encoded and case-insensitive. On the first run, the monitor will convert the keys into indexes: it takes some time if you have many keys. On the second run, the indexes are loaded from a cache.

Here's a more involved example invocation:

./bin/eth2-monitor monitor --beacon-chain-api <BEACON_NODE_IP_ADDRESS>:<BEACON_API_PORT> --print-successful --log-level trace <VALIDATOR_PUBLIC_KEYS_FILE_PATH>

Don't hesitate to run commands with --help to learn more about CLI. 😉

Monitor attestations and proposals

You can monitor the attestation inclusion distance for your validators and alert you if it exceeds a certain threshold. The optimal distance ¹ is being monitored and by default this is set at 2. You can manually set the distance threshold using -d. In order to use the absolute distance, add --use-absolute-distance.

Example:

eth2-monitor monitor -d 1 keys.txt

You can forward notification to Slack using --slack-url.

¹ Optimal distance is the distance between two slots (or blocks) with missed blocks deducted. The optimal distance reflects the best physically possible distance between blocks the attestation is included into the chain. The best optimal distance for an attestation is 0, i.e. the attestation was included at the first possibility. For more information, read Defining Attestation Effectiveness.

Monitor Vanila Blocks

Optionally, if passed the eth2-monitor monitor --mev-relays <FILE_PATH>.json [...] option, eth2-monitor will inquire given MEV relays after every epoch and if there were any proposals in that epoch, compare proposed blocks against what MEV relays produced. If it determines there was a missed opportunity in block rewards, the totalVanillaBlocks Prometheus counter will be incremeneted and a log message produced.

Format of the JSON file is as follows:

[
    "https://0x8b5d2e73e2a3a55c6c87b8b6eb92e0149a125c852751db1422fa951e42a09b82c142c3ea98d0d9930b056a3bc9896b8f@bloxroute.max-profit.blxrbdn.com",
    "https://0x98650451ba02064f7b000f5768cf0cf4d4e492317d82871bdc87ef841a0743f69f0f1eea11168503240ac35d101c9135@mainnet-relay.securerpc.com",
    "https://0xa1559ace749633b997cb3fdacffb890aeebdb0f5a3b6aaa7eeeaf1a38af0a8fe88b9e4b1f61f236d2e64d95733327a62@relay.ultrasound.money",
    "https://0xa15b52576bcbf1072f4a011c0f99f9fb6c66f3e1ff321f11f461d15e31b1cb359caa092c71bbded0bae5b5ea401aab7e@aestus.live",
    "https://0xa7ab7a996c8584251c8f925da3170bdfd6ebc75d50f5ddc4050a6fdc77f2a3b5fce2cc750d0865e05d7228af97d69561@agnostic-relay.net",
    "https://0xac6e77dfe25ecd6110b8e780608cce0dab71fdd5ebea22a16c0205200f2f8e2e3ad3b71d3499c54ad14d6c21b41a37ae@boost-relay.flashbots.net",
    "https://0xb0b07cd0abef743db4260b0ed50619cf6ad4d82064cb4fbec9d3ec530f7c5e6793d9f286c4e082c0244ffb9f2658fe88@bloxroute.regulated.blxrbdn.com",
    "https://0xb3ee7afcf27f1f1259ac1787876318c6584ee353097a50ed84f51a1f21a323b3736f271a895c7ce918c038e4265918be@relay.edennetwork.io"
]

Monitor slashings

You can monitor slashing and send notifications to Slack or Twitter. Use --slack-url for Slack, and --twitter-* CLI options for Twitter. See --help for more details.

To use the reward, use --show-reward. Please, note, it's highly inaccurate, slow and experimental.

Example:

eth2-monitor slashings --slack-url https://hooks.slack.com/services/YOUR_TOKEN

At stakefish, we use it for our Twitter bot.