Update 10/2019 -- Kensington has been replaced by Mordor: https://github.com/eth-classic/mordor

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Kensington testnet

A temporary Atlantis-enabled, proof-of-work testnet for Ethereum Classic.

Consensus Monitoring Dashboard: http://35.226.196.242:3000/ (ask on ETC Discord for WS_SECRET)

Atlantis Hardfork: 100

Parity Ethereum

Required version: 2.4.7+

parity --chain ./parity.json

Geth Classic

Required version: 6.0.6+

geth --chain ./gethc.json

Multi Geth

Required version: 1.9.1+

Genesis file (legacy)

geth init --datadir ~/.ethereum/kensington ./mgeth.json
geth --datadir ~/.ethereum/kensington --networkid 88

Parity chain spec (experimental)

geth --chainspec.parity ./parity.json

Other testnets for Atlantis are available: Kotti (Parity Ethereum, Multi Geth) or Morden (Parity Ethereum, Geth Classic).