Ledger signing: preview hash

[styts]

When signing an operation on the Ledger device, the device shows a preview of the operation hash.

It would bring peace of mind if Temple also displayed the hash so one could be assured that the hashes match.

[unixvb]

Hi, totally make sense.
Thanks

[unixvb]

@styts do you know how the Ledger Tezos app generates Sign Hash?
I'm trying to find find the algorithm they are using but have had no success.

For example, here's hex representation of the buffer that is sent to Ledger

80048100a5034ba91af95397bab6bbab70d9c7e4bd10d7690b65f142a38a147766b53ff1e24e6c00a32ccb728161bfcb4ef6ecf27a57e60ab7c3d36fea099d91f908d74500c0843d01877000f8da63709e9d080fe4670dc8ab96b7e3e800ffff1174657a546f546f6b656e5061796d656e740000003407070089b9d8d4b69dab3f0100000024747a31615770566e386b35615a765661434b504d64635065583863636d35363632534c4c

Ledger Sign Hash

45zn4REnq2Fe4AQwEr8Pd6BaV1WPMoqJAasPVmbXTBtb

[unixvb]

Maybe there is a problem with the Ledger Tezos app.

When I'm trying to sign a massage in Ethereum Ledger App I see Message Hash, but when I'm trying to sign a massage in Tezos Ledger App I see Sign Hash.

If Sign Hash means "signature hash" - it's not possible to generate it on the wallet, cuz private keys are stored on the Ledger.

[styts]

Have you looked at the app repo? https://github.com/obsidiansystems/ledger-app-tezos
Hope this helps, I don't know much further. Maybe reach out to Obsidian devs.