Cryptology ePrint Archive: Report 2020/283

CryptoWills: How to Bequeath Cryptoassets

István András Seres and Omer Shlomovits and Pratyush Ranjan Tiwari

Abstract: In this paper, we put forth the problem of bequeathing cryptoassets. In this problem, a testator wishes to bequeath cryptoassets - e.g. secrets, static keys or cryptocurrency - to their heirs. Crucially, the testator should retain control of their assets before their passing. Additionally testator needs to maintain privacy, i.e. beneficiaries must not learn the bequest, moreover, beneficiaries must not be able to determine whether they will inherit at all before testator's decease. We formally define the security goals of a cryptographic will (cryptowill) protocol and subsequently present schemes fulfilling the required security properties.

Category / Keywords: cryptographic protocols / Secret sharing, Blockchain, Cryptocurrency, Trusted Execution Environment, Time-Lock Puzzle

Date: received 3 Mar 2020

Contact author: istvanseres at caesar elte hu,omer@kzencorp com

Available format(s): PDF | BibTeX Citation

Version: 20200304:081342 (All versions of this report)

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