The Builder Vault TSM supports the following cryptographic signing operations:

In addition, the Builder Vault also supports other cryptographic operations:

MPC Protocols

Blockdaemon Builder Vault MPC solutions are based on public research (some of which was performed by the Blockdaemon team), this includes protocols from the following research papers:

• [DJNP+18] Ivan Damgård, Thomas Pelle Jakobsen, Jesper Buus Nielsen, Jakob Illeborg Pagter, Michael Bæksvang Østergård: Fast Threshold ECDSA with Honest Majority. SCN 2020: 382-400
• [DKLs19] Jack Doerner, Yashvanth Kondi, Eysa Lee, Abhi shelat: Threshold ECDSA from ECDSA Assumptions: The Multiparty Case. IEEE Symposium on Security and Privacy 2019: 1051-1066
• [DKLs23] Jack Doerner, Yashvanth Kondi, Eysa Lee, Abhi shelat: Threshold ECDSA in Three Rounds. SP 2024: 3053-3071
• [MRZ15] Payman Mohassel, Mike Rosulek, Ye Zhang: Fast and Secure Three-party Computation: The Garbled Circuit Approach. CCS 2015: 591-602
• [YWZ20] Kang Yang, Xiao Wang, Jiang Zhang: More Efficient MPC from Improved Triple Generation and Authenticated Garbling. CCS 2020: 1627-1646
• [BLS01] Dan Boneh, Ben Lynn, and Hovav Shacham. 2001. Short signatures from the Weil pairing. In International conference on the theory and application of cryptology and information security. Springer, 514--532.

Internet standards/drafts/RFCs:

• BLS: https://datatracker.ietf.org/doc/draft-irtf-cfrg-bls-signature/

Additional Features

In addition to the cryptographic operations, Builder Vault has a number of features, for example:

• Authentication using API keys, mTLS, OIDC
• Key Derivation (BIP32)
• Presignatures (non-interactive online signing)
• Key Lifecycle Management (key resharing, key deletion)
• Key Import/Export
• Key Share Backup
• Emergency Recovery Service
• Dynamic Node Configuration (MPC node multi-tenancy)