Multisig Explained

How 2-of-2 multisignature actually works in SSP — and why it matters.

Multisig wallets require multiple signatures to authorize a transaction. SSP enforces 2-of-2 on every signed action: the browser extension and the mobile SSP Key app must both approve. This page collects the deep-dives that explain how the model works, what attacks it stops, and where its limits sit.

Square SSP Academy cover: crypto for couples and families

Crypto in a household: shared funds, separate keys and what happens if

Couples, parents and families can self-custody together — if they decide who holds what. Three questions to answer first, common household setups, planning for absences, holding for children, and where SSP fits.

4 min
Square SSP Academy cover: treasury policy for teams

A treasury policy for small teams: who can move the money

A crypto treasury held by one person is one mistake away from a loss. Five questions every team's treasury policy should answer, a starting template, and how SSP Enterprise maps to each of them.

5 min
Square SSP Academy cover: time locks on blockchains

Time locks: coins that can't move until a certain moment

Time locks let the chain enforce when coins can move, not just who can move them. Absolute and relative locks, how Bitcoin and smart-contract chains implement them, what they're good for, and their trade-offs.

4 min
SSP Academy square cover: roles and permissions in SSP Enterprise

Roles and Permissions in SSP Enterprise

Organisation roles are records; the signer set is an address. The full permission matrix, why admins cannot touch admins, and what requires re-signing.

6 min
SSP Academy square cover: SSP Enterprise multisig vaults for teams

SSP Enterprise: Multisig Vaults for Teams

How organisations, vaults, roles and proposals fit together in SSP Enterprise — and which of them actually stop a transaction rather than just shaping it.

8 min
SSP Solana multisig wallet cover with key, shield, lock and fingerprint icons

The Self-Initiating Solana Multisig Wallet

How SSP built a self-initiating Solana multisig wallet where the address itself is the member set, pre-fundable and permissionless to register.

8 min
SSP and Squads V4 Solana multisig design comparison

SSP vs Squads V4: Two Solana Multisig Designs

An honest comparison of two Solana multisig designs — SSP's deterministic primitive and Squads V4's audited governance platform.

7 min
Square SSP cover for an article on why Solana multisig wallet addresses are hard to create

Why Solana Multisig Addresses Are Hard

Solana accounts must be created before they exist. See why that makes a multisig wallet address hard, and how Bitcoin and Ethereum sidestep it.

7 min
Square SSP cover for an academy article on durable nonces and two-device Solana signing

Durable Nonces: Two-Device Signing on Solana

Why a Solana blockhash expires before your phone can approve, how durable nonces fix it, and how SSP derives the nonce account so you never store it.

7 min
Navy SSP cover with shield, key, eye-off and CPU icons on a dark gradient, the failure-modes chapter of Multisig Deep Dive

Multisig failure modes and how SSP mitigates them

Five multisig failure modes: lost device, lost seed, key compromise, server outage, total destruction — and the recovery path for each in SSP.

10 min
Navy SSP cover with key, lightning and shield icons on a dark gradient, the single-signer UX chapter of Multisig Deep Dive

Single-signer multisig: how SSP makes two devices feel like one wallet

How SSP collapses 2-of-2 multisig into single-signer UX, what is hidden, where it breaks, and why the friction you see is the security.

9 min
Navy SSP cover with key, shield, fingerprint and lock icons on a dark gradient, the social-recovery comparison chapter of Multisig Deep Dive

Social recovery vs multisig: two answers to losing a key

Multisig protects against theft; social recovery protects against loss. Side-by-side comparison of when each wins for solo, joint and team setups.

8 min
Navy SSP cover with key, shield, CPU and lightning icons on a dark gradient, the Schnorr chapter of the Multisig Deep Dive series

Schnorr signatures and multisig aggregation

How Schnorr's linearity lets multisig become a single on-chain signature, what MuSig2 does, and what aggregation changes for SSP fees and privacy.

9 min
Navy SSP cover with key, shield and CPU icons on a dark gradient, the BIP48 chapter of the Multisig Deep Dive series

BIP48 explained: the derivation path behind SSP

How BIP48 standardises multisig wallet construction, why SSP follows it, and what that means for recoverability outside SSP.

8 min
Navy SSP cover with key, shield and lock icons on a dark gradient, the m-of-n picker chapter of the Multisig Deep Dive series

2-of-2 vs 2-of-3 vs m-of-n multisig: picking the right threshold

Multisig threshold guide for solo, joint and team setups: when 2-of-2 suffices, when 2-of-3 starts to pay for itself, when teams need 3-of-5.

8 min
Navy SSP cover with key, shield and lock icons over a dark gradient, opening the Multisig Deep Dive series

What is multisig, and why it matters

Plain-English intro to multi-signature wallets — what m-of-n really means, how it differs from a single-key seed backup, and when it's worth the friction.

7 min
Diagram of a 2-of-2 multisig wallet showing two signers approving one transaction

What is 2-of-2 multisig?

2-of-2 multisig splits the keys to your wallet across two devices so no single seed, screen, or signature can move your coins alone.

9 min