ark/website/docs/learn/boarding.md

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2	Boarding the Ark

Overview

Alice wants to board the Ark of a well-known Ark service provider (ASP). It requires an on-chain transaction.

Depending on the type of Boarding transaction chosen by the ASP, the timeline is different.

🧳 Boarding with Luggage

• Alice must be online at least once every 4 weeks to keep her funds safe
• If ASP is unresponsive, Alice can claim her funds back in 24 hours
• Easier for the ASP since all VTXOs are born equal
• To unlock the boarding address Alice needs to make two transactions:

flowchart LR
  V["VTXO's timeout after 24 hrs"]
  Covenant --> V

Timeline of events

1. Alice creates a Boarding transaction
2. Alice adds any inputs she wants to cover the values the VTXO she will receive, plus on-chain fees
3. Alice adds an output with 2 spending paths:
   • This funds will belong to the ASP after 4 weeks:
     • (ASP after 4w)
   • A covenant output that forces coins to be spent by a VTXO with an output script with 2 spending paths:
     • (Alice + ASP)
     • (Alice after 24h)
4. Alice notifies ASP about the Boarding transaction
5. Alice has now a promise of a VTXO enforced by a covenant

🎒 Boarding without Luggage

• Alice don't need to worry about being online to maintain access to her funds after boarding
• If ASP is unresponsive, Alice can claim her funds back in 1 year
• ASP must be aware of the timeout on the Boarding transaction to prevent double spending

Timeline of events

1. Alice creates a Boarding transaction
2. Alice adds any inputs she wants to cover the values the VTXO she will receive, plus on-chain fees.
3. Alice adds an output with 2 spending paths:
   • (Alice + ASP)
   • (Alice after 1y)
4. Alice notifies ASP about the Boarding transaction
5. Alice can have this deposit to be accepted as if it were a normal VTXO born in an Ark Pool transaction