An address starting with “5” or a capital letter indicates that your account is using a Substrate (5) or Kusama (capital letter) address. The following address formats apply:

  • Kusama: addresses start with a capital letter
  • Polkadot: addresses start with a 1
  • Substrate: addresses start with a 5

If your address is showing the wrong prefix, here is how to change it: 

1. On polkadot.js

  1. Go to the Settings tab
  2. Select "Default for connected node" 
  3. Click Save & Reload
  4. Your addresses will now always show in the correct format, whether you have Polkadot or Kusama selected on the top left. 


2. In the polkadot.js browser extension:

  1. Click on the gear icon in the upper-right corner.
  2. In the pulldown “Display Address Format For”, select Polkadot or Kusama - depending which format you're looking for. 


Your addresses will immediately change to the correct format. 


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