add sign certificate command

LedgerHQ / app-vechain

Apache License 2.0

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add sign certificate command #5

Closed uldaman closed 4 years ago

uldaman commented 5 years ago

This PR is to support VIP 192.

VIP 192: This proposal outlines a signing mechanism which allows an applications to request a user's authentication or to ask a user to agree with an agreement, such as Terms of Service in a secure way.