Multisig Setup - Bitcoin Policy Studio

What is multisig?

A multisig (multi-signature) address requires multiple keys to authorize a transaction. For example, a 2-of-3 multisig needs any 2 out of 3 keys to sign before funds can be spent.

Common use cases:

Personal security: 2-of-3 — keep keys on phone, laptop, and hardware wallet. Lose one, still safe.
Business treasury: 3-of-5 — requires multiple executives to approve spending.
Inheritance: 2-of-3 — you + spouse + lawyer. Any two can access funds.
Escrow: 2-of-3 — buyer + seller + arbitrator.

Step 1: Configure your multisig

Required signatures (M)

Total keys (N)

2-of-3: Any 2 keys out of 3 must sign to spend.

Each key should be from a different device or person. The whole point of multisig is that no single point of failure can compromise your funds.

Step 2: Enter public keys

Enter the public keys (hex, 33 bytes compressed) from each participant. You can get these from Sparrow (Settings > Keystore > xpub), Coldcard (export), or generate them below.

Your Multisig Address

P2WSH Multisig Address

Output Descriptor (import into Sparrow/Bitcoin Core)

Script details

Redeem Script (ASM)

Witness Script (hex)

How to use this multisig

Send funds to the address above from any wallet.
To spend: Create a PSBT (Partially Signed Bitcoin Transaction) in Sparrow or Bitcoin Core.
Collect signatures: Pass the PSBT to each required signer. Each signs with their key.
Combine and broadcast: Once M signatures are collected, finalize and broadcast the transaction.

Import into Bitcoin Core (CLI)

Import into Sparrow Wallet

File > New Wallet > name it "My Multisig"
Policy Type: Multi Signature
Set M-of-N to match your configuration
For each keystore, import the xpub or paste the descriptor above
Click Apply