Any idea how the trezor could be used to sign longer messages? Like if you wanted to sign a contract that was a few pages long.
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Everything digital could be reduced to a single hash. Then sign the hash that corresponds to the document.
It expects a little to much in the way of technical skill on the part of the user. I thought about this today when i found myself needing to sign a message longer than the trezor would allow.
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i thing that getting a hash of a file s as simple as 1 command? like sha256 contract.xml and it returns the string with hash value right there in the terminal. signing that as usual with your favorite bitcoin client. it is two steps but two small steps.
It still wouldn't have been appropriate for me to say. Here is a hash of the doccument: blablabla. Hash the document yourself to make sure you get the same hash. Now here is a signature of that hash: blablabla. Not as a businessman. You cant put barriers like that between people and your service. Even though in theory it is as simple as you said if they are using linux.
And actually it wouldnt have worked with bitrated.com (which is where i wanted to use an address stored on my trezor but couldn't). It's an automated process. I cant "explain" to it that its a signature of the hash of the document rather than the signature of the document that it asked for.