trezor-firmware
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elements: add rangeproof nonce derivation
Following https://github.com/trezor/trezor-firmware/pull/317#issuecomment-585648571, we would like to allow confidential transaction output unblinding on the host by adding a new API for Elements rangeproof nonce derivation (see device tests at elements/wip branch).
fixup looks good!
Thanks :)
Squashed and rebased over master.