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Message signing example

This example demonstrates how to sign a message. See CIP-8 for more information.

Requirements

Message signing support:

  • on Ledger, Cardano app version TBD and above
  • on Trezor, firmware TBD and above

Sign a message

If you want to use an address in the address header field, prepare the address file. In this example, we will use the address file payment.addr (generated like in the transaction example guide). If you leave out the --address argument, the signing key hash will be used in the address header field instead.

cardano-hw-cli message sign \
  --message "hello world" \
  --signing-path-hwsfile payment.hwsfile \
  --address $(cat payment.addr) \
  --address-hwsfile payment.hwsfile \
  --address-hwsfile stake.hwsfile \
  --out-file msg.out

You can use --message or --message-hex to specify the message to sign in ASCII or hex format, respectively. If you add --prefer-hex, the message will be shown in hex on HW wallet screen even if it is valid ASCII.

If you add --hashed, the message will be hashed before signing.

If successful, the command should save output data to the msg.out file.