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I want to sign and verify a message using a segwit private key that i generated with another application. How can I sign and verify a message using electrum 3 cli?

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Electrum provides signmessage and verifymessage commands that you can use to sign and verify messages.

For signing messages with a different private key, you will need to import it into the wallet.

Verifying a message does not require any additional work.

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First convert and import the key then go to view menu > show addresses, switch to addressess tab, right click on the address and choose sign/verify.

However note that the format Electrum uses for signatures from bech32 address private keys may be different from what other apps/hardware wallets use so your generated signature may not verify in other wallets.

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