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EIP-2657: Ephemeral Testnet Yolo

Authors James Hancock (@madeoftin)
Created 2020-04-19
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Disclaimer: This is for testing basic infrastructure. It will be nuked. It is not for deploying dapps, nor does it define what will go into mainnet. For information on network upgrades, please follow the relevant meta EIPs and ongoing discussion on Ethereum/pm.


The specification for Ephemeral Testnet Yolo. Clients who wish to sync need to implement the following features into their client. It is for testing basic infrastructure and will be nuked.


Name: Yolo ID: YOLO-v1

[ ] Proposed - [x] Consensus to include.


  • Deployed: June 3rd 2020

Client Consensus -> Implementation

YOLO-v1 | Client | Signal | Spec | Merged | Syncing | |————–|——–|——|——–|———| | Besu | x | x | | | | EthereumJS | x | | | | | Geth | x | x | x | x | | Nethermind | x | x | | | | OpenEthereum | x | x | | | | Trinity | | | | |

Signal - Client intends to participate. (You are on the bus)

Spec - Client is satisfied with the proposed specification. (You agree with the direction)

Merge - Changes are implemented in the client and configurable for YOLO. (You are ready to hit the gas and go)

Syncing Client syncs with the network

Syncing Instructions


  • Yolo V1 testnet is up and running
  • Support is baked into Geth master branch via –yolov1
  • Genesis config json is at
  • EF bootnode at enode://9e1096aa59862a6f164994cb5cb16f5124d6c992cdbf4535ff7dea43ea1512afe5448dca9df1b7ab0726129603f1a3336b631e4d7a1a44c94daddd03241587f9@
  • Stats page secret is YOLOv1, with geth you can –ethstats=’’
  • Faucet is unauthenticated, you can reach it from the dashboard

Copyright and related rights waived via CC0.


Please cite this document as:

James Hancock (@madeoftin), "EIP-2657: Ephemeral Testnet Yolo [DRAFT]," Ethereum Improvement Proposals, no. 2657, April 2020. [Online serial]. Available: