Yes. One Guardian subscription can be used with as many multi-signature wallets as you need. Guardian is not a wallet in its own right: it is a key that Bitaroo contributes to your wallet, together with a co-signing service. Nothing in Guardian limits how many wallets that key is used in.
The key Bitaroo contributes is the same in every wallet
When you join a plan, Bitaroo assigns you a public key, which you can view at any time under Bitaroo's Public Key(s) in the Guardian dashboard. That key stays the same for the life of your subscription, so if you build a second wallet, you use the same Bitaroo key again.
Your wallets are still entirely separate. Because your own keys differ between them, each wallet has its own addresses, its own balance and its own history, and a transaction in one has no bearing on the other.
Setting up a second wallet
You create the second wallet in your own wallet software, exactly as you created the first. In wallets such as Sparrow, and on devices such as the Coldcard, a second wallet is usually made by changing the account in the derivation path, which gives you a different set of your own keys from the same recovery phrase.
Guardian accepts standard derivation paths, including a change of account. If your first wallet uses m/48'/0'/0'/2', for example, a second wallet on account 1 would use m/48'/0'/1'/2'. Make a note of the derivation path for each wallet, because you supply it whenever you ask Bitaroo to co-sign.
Accounts are not the only way. A second wallet built from a different recovery phrase, or from different hardware wallets, works just as well.
Asking Bitaroo to co-sign for a particular wallet
Each co-signing request stands on its own. When you open Submit a co-signing request, you upload the PSBT and enter the public keys and derivation path belonging to the wallet that transaction came from. That is how Bitaroo knows which wallet to co-sign for, so you can submit a request for one wallet today and for another wallet tomorrow.
Keep your own record of the public keys and derivation path for every wallet you build, because you need them each time you request a co-signature.
Stored co-signing details cover one wallet
On the Standard and Premium plans you can store your co-signing details with Bitaroo, so that your wallet details are on file. This holds one set of details. If you store details for a second wallet, they replace the details already stored.
Store the wallet you would most want help with, and keep your own backup of the others. Storing details is a convenience rather than a requirement: you can still request a co-signature for any wallet by entering its details at the time.
Which plan you need
Every plan, including Starter, can request a co-signature for any of your wallets. The plans differ in what is included, not in how many wallets you may have.
- Starter. The Bitaroo key and support setting up your wallet. Co-signing details cannot be stored, and no co-signs are included, so every co-signing request is charged.
- Standard. Adds stored co-signing details and one free co-sign and broadcast each year, with a lower charge on any further requests.
- Premium. Adds three free co-signs and broadcasts each year at the lowest rate, along with special instructions, guided setup and hardware wallets.
If you expect to call on Bitaroo only in an emergency, the Standard plan suits that pattern well: the included co-sign covers the occasional request, and your details are already on file. See the fees page for the current rates.
Your security does not change
Using the Bitaroo key in more than one wallet does not weaken any of them. Bitaroo holds only the key or keys it contributes, and your own keys are still required before anything can move. Bitaroo cannot move the bitcoin in any of your wallets on its own.