Trezor based Sign Message produces bad signature about electrum-ltc HOT 13 CLOSED

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Looks like I'll have to buy me a Trezor, so that I can debug this :)

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I have the same error. I can't see why anything should be different than Bitcoin except the CoinType, which looks correct.

@MarvinOl have you tried sending any LTC yet? I haven't put anything in my trezor wallet yet so cannot confirm if that works.

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@wozz nope - I have not read the full protocol documentation but as far as I understand signing messages is basically the same operation as sending coins (sending coins is just a specially formatted signed "text message" - correct me if I got this wrong). I have not yet used real LTC with my Trezor as message signing does not work.

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I was able to confirm that bitcoin testnet message signing (and transaction sending) is working on trezor, which is also treated as a separate coin type. The interface to the trezor is two separate commands for message signing and transaction signing, so it's possible tx signing works without message signing working.

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Ok, just confirmed sending transactions is working for me. So only message signing is broken to my knowledge.

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Thanks for the Trezor support again! I bit the bullet and tested with real LTC - no problems, works as expected. So there are clearly 2 different operations with signing messages and signing transactions - and signing transactions works with no problems.

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I've opened an issue in the Trezor repository: trezor/trezor-mcu#3

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I recommend changing the magic to "Bitcoin Signed Message" here:
https://github.com/pooler/electrum-ltc/blob/v1.9.8.4/lib/bitcoin.py#L351
This is a very poor decision to break things appart for no obvious reason.

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@prusnak: Litecoin Core has been using the magic string "Litecoin Signed Message" since 2011. What you are proposing would break compatibility with all other Litecoin clients, which is highly undesirable.

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That is indeed very unfortunate ... I'll reopen the trezor-mcu issue.

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Fixed in TREZOR firmware 1.3.6

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@prusnak Thank you!

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See #34 though.

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