How to Use the sBTC Bridge with Asigna

This guide is specifically for entities or teams that use Asigna as it will demonstrate the flow for a multi-signature setup. This assumes you have the Asigna web wallet setup with its browser extension.

The sBTC Bridge is a web application allowing you to convert your BTC into sBTC on the Stacks chain. If you aren't familiar with sBTC, be sure to check out the sBTC Conceptual Guide to understand how it works.

Asigna has the sBTC Bridge as an embedded app within its web wallet. This guide will be using that embedded app.

The sBTC Bridge has been designed to be as simple as possible to use. But specifically for this guide, a 2-of-2 multi-signature setup of a Bitcoin vault AND a separate Stacks vault. It is assumed you have a similar setup as this guide will walkthrough the different steps needed to take in such a scenario where 2 parties of this 2-of-2 multi-signature setup need to sign transactions.

Walkthrough for minting sBTC

Here are the necessary steps to convert your BTC to sBTC using Asigna:

1

Confirm your BTC and STX vaults

First, you'll need to make sure you have a vault for Bitcoin, and a separate vault for Stacks. In this scenario, the same 2-of-2 signature setup are applied for both vaults. Throughout the guide, we'll refer to each party of this setup as Member_1 and Member_2.

Member_2's POV of both its Bitcoin vault and Stacks vault setup.
2

Navigate and open the embedded sBTC Bridge app in Bitcoin vault

Click into the Bitcoin vault and scroll down to the 'Trending Apps' section where you'll locate the sBTC Bridge embedded app. Open this embedded app and choose the 'Asigna Multisig' wallet to connect with.

Locate the sBTC Bridge embedded app and open it.
Connect with the Asigna Multisig wallet option. This app will auto connect with the Bitcoin vault that is being using in this context of the embedded app. You won't need to connect to a Stacks vault but you will need a Stacks vault address to use as the receiving address of the minted sBTC.
3

Choose the amount of BTC to deposit

After your Bitcoin vault is connected, choose how much BTC you would like to convert to sBTC.

There are two transaction fees required to mint your sBTC. The first is when they initiate the bitcoin deposit transaction within their wallet. The second is a fee used to consolidate the deposit UTXOs into the single Signer's UTXO. This separate transaction fee happens automatically and is set to a max of 80k sats. This is automatically deducted from your minted sBTC. This is not a Signer fee but a regular bitcoin transaction fee.

Currently the minimum to peg-in is 0.001 BTC.
4

Choose the Stacks address from the Stacks vault

Next, enter the Stacks address you would like your sBTC minted to. For this guide, we'll be using the Stacks address of the Stacks vault that is assumed to be setup by both Member_1 and Member_2.

Copy the multi-signature Stacks address from the Stacks vault setup.
Review the inputted STX address, hit 'NEXT', and then 'CONFIRM'.
5

Select Fee Rate

Depending on congestion of the Bitcoin network, choose the appropriate fee rate based on your vault's preferences for timely confirmation.

6

Confirm the transaction creation

Whomever member, of the 2-of-2 multi-signature setup, is currently acting as the context of the sBTC Bridge embedded app, a popup modal of that member's wallet will appear for confirmation. In this guide, is it Member_1 that is acting as the context and is currently connected with the Bitcoin vault using Xverse. Therefore, the Xverse wallet popup will appear for confirmation.

Remember, this transaction is the initial peg-in transfer for your BTC to the sBTC Signers.

If you have a multi-signature setup with certain signatures required, hitting 'Confirm' will not broadcast the bitcoin transaction, it will simply store this partially signed transaction in your Bitcoin vault until all required signatures are met.

Review the transaction and hit confirm to create the partially signed bitcoin transaction where it will be waiting for the other members to sign in their respective Asigna Bitcoin vaults.
7

Sign and approve transaction by other members

Upon notice of transaction to the other members of the multi-signature setup, each necessary member will need to approve the pending transaction in their own respective Asigna Bitcoin vaults.

In our case, Member_2 will navigate to their own Bitcoin vault and find the pending partially signed bitcoin transaction waiting for signature.

Member_2 will locate the pending transaction and complete signature as their approval.
Member_2 will see their connected wallet, in this case Leather, popup for them to confirm transaction.
8

Broadcasting of transaction

Once all transaction policies are satisfied and approved, the sBTC Bridge embedded app will appear with a prompt confirming that all signatures have been gathered successfully which will then automatically prompt the broadcasting of the transaction.

Great! All signatures have been gathered for the transaction to be broadcasted.
9

Receive your sBTC

Back in the sBTC Bridge app UI, you can monitor the status of your transaction to see when it has been completed, at which point you can see the sBTC in your Fordefi wallet. It will go through three stages:

The bitcoin and subsequent sBTC mint transaction will take some time to be completely processed by the Signers
Once both the bitcoin and sBTC mint transactions are confirmed, the sBTC Bridge app will show a 'Completed' status
You'll then be able to see the sBTC balance in your Asigna Stacks vault.

Reclaiming BTC

If your sBTC mint fails, you can reclaim your sBTC. You can do this via the bridge by visiting the reclaim page at https://sbtc.stacks.co/<TX_ID>/reclaim and replacing the bracketed text with your transaction ID as shown below: https://sbtc.stacks.co/8f37f750b6646f0a217121201967170bd3cfef5f2ebd4f30f359b5e9308470c4/reclaim

There is an intermediate step in between depositing BTC and the sBTC signers consolidating it into the single signer UTXO. If the transaction is not picked up by signers, you can reclaim it using this UI. Note there is a 'Lock Time' field on the Reclaim page. That indicates the amount of blocks that must have passed in order to reclaim your BTC.

This initiates a Bitcoin transaction that will transfer your BTC back to you.

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