Inside Iceberg: The (Secret) Leap Forward in Bitcoin's Cryptography
summary
Claims a formal proof that nested MuSig is secure, describes moving from that proof toward FROST-style threshold signatures, and introduces an upcoming scheme codenamed Iceberg. Lays out the Alice Bob Carol 2-of-3 construction using replicated secret sharing, shows the naive three-secret nonce scheme enables nonce reuse and key leakage, and sketches mitigations and a concrete protocol path that aims to produce practical thresholdized Schnorr/Taproot keys for Lightning and custody.
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chapters (10)
- 0:00Start
- 1:25Proving Nested Multisig Is Actually Safe
- 2:52Multisig on Top, Thresholds Underneath
- 3:41One Schnorr Key Representing Many Signers
- 5:09Ark, DLCs & Lightning Gossip
- 7:05Privacy and Programmability Through Cryptography
- 8:21Community Funds and Granular Approval Policies
- 9:34The Alice, Bob & Carol 2-of-3 Example
- 10:44Thresholds Nested Inside MuSig
- 12:17Why Naive Nesting Breaks
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