@avi_eisen Ok here is another take.
Let x in |R. We're looking for f(x). Let x_1 be x+1. According to the initial problem we are given all f(y), where y<x_1, including f(x_1-1). So we can predict f(x).
@Ledger What about Shamir-Secret-Sharing-like or PVSS backup onto multiple Recovery Keys? A scheme where any m out of n PIN-protected cards can restore the mnemonic.
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