Paper 2020/023

Threshold Multi-Signature with an Offline Recovery Party

Riccardo Longo, Alessio Meneghetti, and Massimiliano Sala


Key custody is a sensitive aspect of cryptocurrencies. The employment of a custodian service together with threshold-multi-party signatures helps to manage secret keys more safely and effectively, e.g. allowing the recovery of crypto-assets when users lose their own keys. Advancing from a protocol by Gennaro et al. we propose a protocol with two main properties. First it allows the recovery party to remain offline during the enrollment of any user, solving a real-life problem of maintaining online only one trusted third party. Second our multi-party signature is compatible with a deterministic derivation of public and private keys.

Available format(s)
Cryptographic protocols
Publication info
Preprint. MINOR revision.
digital signaturesthreshold cryptographysecure multi-party computationcryptocurrencythreshold signatureprovable security
Contact author(s)
riccardolongomath @ gmail com
almenegh @ gmail com
maxsalacodes @ gmail com
2020-01-09: revised
2020-01-09: received
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Creative Commons Attribution


      author = {Riccardo Longo and Alessio Meneghetti and Massimiliano Sala},
      title = {Threshold Multi-Signature with an Offline Recovery Party},
      howpublished = {Cryptology ePrint Archive, Paper 2020/023},
      year = {2020},
      note = {\url{}},
      url = {}
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