I've made some changes to my blockchain setup recently. I switched the signature over to EthereumSignature, which changed my AccountId to an H160 size. Thankfully, I can still use scripts to manage balances and move funds between accounts.

I also set up four prefunded accounts on the dev node for testing. But here's where I hit a snag. Polkadot.js doesn't seem to be recognizing these prefunded dev accounts.

Anyone else run into this or have any ideas on how to fix it? Any suggestions would be much appreciated!

The 4 prefunded account are defined as such:


What polkadot.js shows: enter image description here

3 Answers 3


Apps actually does have a dedicated set of ethereum-style dev accounts and it does know how to make ethereum-style signatures. The tricky part is that it only enables this feature on a few hard-coded chain spec names.

Check out https://github.com/polkadot-js/apps/blob/e55b9fc67b0dc1f36f2123948fb4a8f18cdc7a38/packages/apps-config/src/settings/ethereumChains.ts#L4 for the hard-coded list.

If you are building a production chain, you could open a PR to add your spec name to that list. But if you are just developing and experimenting, you could consider changing your spec name to one that is already on the list. I used frontier-template and now Apps is working for me!

enter image description here

I would love it if there were some way to manually tell Apps to use the ethereum-style signatures and accounts. I've opened a feature request for that here https://github.com/polkadot-js/apps/issues/9632


There is no recognition logic, just hardcoded values


So you just should update the addresses of prefunded accounts to match the hardcoded pairs.

  • 1
    Nice! It appears that Ethereum hardcoded addresses are also in existence. These are seemingly utilized exclusively when the keyring is of the Ethereum type, as evidenced here: github.com/polkadot-js/common/blob/… Any insights on how polkadot.js might be capable of identifying when it is operating on an Ethereum signature node?
    – ALeSD
    Commented Jun 25, 2023 at 6:38

I believe that polkadot.js just show some well known keys in accounts when connecting to a development node, not necessarily the ones you have prefunded in your genesis config.

I must be missing some details, but I think it works this way.

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