michaelsproul

#!/usr/bin/env fish

# - Use exec so that the parent can signal `docker run` directly.
# - Proxy signals from `docker run` to the container, allowing it to terminate gracefully.
# - Use host networking so that Lighthouse tests which expect to fork from localhost continue
#   to work.
exec docker run -i --sig-proxy=true --network=host trufflesuite/ganache:latest $argv[1..-1]

michaelsproul

# Attempt to slash validators from https://papers.ssrn.com/sol3/papers.cfm?abstract_id=4036000
import requests

def get_attestations(slot):
    res = requests.get("https://beaconcha.in/api/v1/block/{}/attestations".format(slot))
    res.raise_for_status()
    return res.json()

def get_validator_att(atts, validator):
    return [att for att in atts["data"] if validator in att["validators"]][0]

michaelsproul

FROM rustembedded/cross:aarch64-unknown-linux-gnu-0.2.1

RUN dpkg --add-architecture arm64 && \
    apt-get update && \
    apt-get install -y apt-transport-https wget && \
    (wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add -) && \
    printf "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-12 main\ndeb-src http://apt.llvm.org/xenial/ llvm-toolchain-xenial-12 main" > /etc/apt/sources.list.d/backports.list && \
    apt-get update && \
    apt-get install -y llvm-3.9-dev libclang-3.9-dev clang-3.9 && \
    apt-get purge -y apt-transport-https wget

michaelsproul

You might be reading this because you've noticed that some validator on mainnet are earning extra rewards.

This is due to a new feature of the beacon chain added in the Altair fork called sync committees. Sync committees are groups of 512 validators which are randomly selected every 256 epochs (~27 hours) to perform additional duties. They sign a message called a SyncCommitteeMessage every slot, which is similar to an attestation. For more information, you can read Vitalik's write-up in the annotated spec:

https://github.com/ethereum/annotated-spec/blob/master/altair/sync-protocol.md

So far none of the explorers show the sync committees explicitly, so they are chronicled here in the meantime.

Some of the early sync committees are included below as sync_committee_$epoch.txt files, where $epoch is the epoch at which that committee begins performing duties. Each line of the file is a validator index (512 total). You'll notice that the first two committees are identical: this is intentional (it si

michaelsproul

for i in (seq 416 520)
    set set_bits (block.sh $i | jq .data.message.body.sync_aggregate.sync_committee_bits | python3 -c "print(bin(int(input().strip('\"').replace('null', '0x0'), base=16)).count('1'))")
    echo "block $i: $set_bits"
end

michaelsproul

[package]
autotests = false

[[test]]
name = "lighthouse_tests"
path = "tests/main.rs"

michaelsproul

curl -X POST -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"eth_syncing","params":[],"id":1}' "http://localhost:8545"

michaelsproul

Lighthouse: how to fix empty validator_definitions.yml

Lighthouse is affected by a bug (sigp/lighthouse#2159) which can cause the validator_definitions.yml file to become corrupted if the disk where Lighthouse's datadir is stored becomes completely full.

Preventing the bug

The best defense against this bug is to ensure your disk doesn't fill to 100%. If you have been running Geth since December 2020 with a 1TB SSD, you may be close to reaching this limit and we recommend that you:

1. Stop Geth immediately: sudo systemctl stop geth.service (tweak the service name appropriately)
2. [Optional] If you do not already have an Eth1 failover configured, add one to your Lighthouse beacon node config. You can sign up for a free service like Infura or Alchemy and add the URL to the ExecStart line for your Lighthouse beacon node. More info in the book.

michaelsproul

#!/usr/bin/env fish

# Usage: ./participation_rate.fish 3150
# Requires: fish, curl, jq, Lighthouse BN API on port 5052
# Set the target epoch to at least 2 before the current epoch
set target_epoch (math "$argv[1] + 1")

set global_votes (curl --fail --show-error -s "http://localhost:5052/consensus/global_votes?epoch=$target_epoch"; or exit)
set prev_active_gwei (echo $global_votes | jq .previous_epoch_active_gwei)
set prev_attesting_gwei (echo $global_votes | jq .previous_epoch_attesting_gwei)

michaelsproul

#!/usr/bin/env bash

curl -s "http://localhost:5052/beacon/validators/all" \
    | jq -r 'map(select(.validator.slashed == true) | .validator_index) | join("\n")'