Multi-Signature (Multisig)

Definition

Multi-signature requires multiple private keys to authorize a transaction, specified as M-of-N (e.g., 2-of-3 requires any 2 of 3 designated keys). Multisig provides enhanced security, shared control, and organizational governance. Post-quantum multisig uses SPHINCS+ signatures from multiple parties.

Technical Explanation

Multisig transactions contain multiple signatures validated by the blockchain. Smart contract or script logic enforces the M-of-N requirement before accepting the transaction. Each signer uses their own private key independently—no single party can transact alone.

Post-quantum multisig considerations: multiple SPHINCS+ signatures multiply transaction size. A 3-of-5 transaction includes 3 full signatures (potentially 21-150 KB). Verification requires checking each signature against its corresponding public key. Larger but still practical for security benefits.

SynX Relevance

SynX supports multisig configurations with quantum-resistant SPHINCS+ signatures. Organizations can require multiple approvals for transactions—treasury management, partnership funds, inheritance planning—while maintaining quantum security throughout. Each signature independently resists quantum attacks.

Frequently Asked Questions

Is 2-of-3 multisig common?: Yes—allows spending if one key is lost while requiring consensus between two parties.
Can multisig keys be in different locations?: Yes—geographic distribution adds security. Signers can be in different countries.
Are post-quantum multisig transactions slow?: Larger signatures take marginally longer to verify, but completion is still near-instant.

Shared security with quantum resistance. Multisig wallets with SynX