afri schoedon
dns q9f.cc | ens q9f.eth | ipns q9f.cc | email a@q9f.cc | pgp 0x71dc2df9

• dev.to/q9
• github.com/q9f
• bsky.app/q9f.cc
• warpcast.com/q9
• fosstodon.org/@afr
• stackoverflow.com/users/1260906/q9f

chainsafe systems

• head of protocol engineering - i'm hiring!
• chainsafe/lodestar - typescript ethereum consensus layer
• chainsafe/forest - rust filecoin full node
• chainsafe/gossamer - go polkadot host

ruby/rails

• q9f/eth.rb - ethereum signer and rpc-client
• q9f/keccak.rb - ethereum's sha3-flavor digest
• q9f/ethereum-on-rails - rails authentication w/ metamask

crystal

• q9f/secp256k1.cr - pure crystal secp256k1 ecdsa
• q9f/bip39.cr - pure crystal bip-0039 mnemonics
• q9f/rlp.cr - pure crystal rlp serializer

meta

• eth-clients/holesky - holesky merged-from-genesis, public ethereum testnet
• eth-clients/sepolia - sepolia ethereum cross-client proof-of-authority testnet
• goerli/medalla - medalla ethereum multi-client consensus testnet
• goerli/testnet - goerli ethereum cross-client execution testnet
• ethereum/ropsten - rospten ethereum proof-of-work execution testnet

specifications

• fip-0039: filecoin message replay protection
• eip-1716: hardfork meta: petersburg
• eip-1679: hardfork meta: istanbul
• eip-1234: constantinople difficulty bomb delay and block reward adjustment
• eip-0999: restore contract code at 0x863df6bfa4469f3ead0be8f9f2aae51c91a907b4
• eip-0649: metropolis difficulty bomb delay and block reward reduction

publications

• ethberlin 0004 manifesto
• how to merge an ethereum network right from the genesis block
• ethb3rlin manifesto
• finally authenticating rails users with metamask
• finally understanding ethereum accounts
• ethereum 2.0 mainnet clients
• how to run your own beacon chain
• ethereum node configuration modes cheat sheet
• the goerli testnet proposal - a call for participation
• the ethereum-blockchain size will not exceed 1tb anytime soon
• solving the problem with ethereum cross-client private networks

presentations

• devconnect 2023: holešky - a proof-of-stake testnet ahead of mainnet
• protocol berg 2023: opening & closing ceremony
• ethereum berlin 03/2023: görli, sepolia, holešky
• devcon 2022: post-merge testnets
• edcon 2020 keynote: final road to ethereum 2.0 - multi-client testnets
• ethcc 2020: why you don't want to develop on the ropsten testnet
• etc summit 2019: state of the ethereum classic testnets
• etc summit 2019 keynote: atlantis hardfork and beyond
• ethcc 2019: what's the goerli testnet and why do you care
• goerlicon 2019: goerli testnet launch
• ethereum berlin 03/2016: ethereum stack-exchange

conferences

• ethberlin 0004 2024
• 37c3 cdc 2023
• protocol berg 2023
• ethb3rlin 2022
• 36c3 cdc 2019
• ethberlin zwei 2019
• goerlicon 2019
• ethberlin 2018