xmr-btc-swap/docs/sequence.puml

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@startuml
database Bitcoin
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actor Bob as "Bob (User)"
Actor Alice as "Alice (Service Provider)"
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database Monero
group Negotiation
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Bob --> Alice: Establish connection
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group Request Response Channel
Bob -> Alice: Quote request
note left: Btc Amount\naddress hints
note right: Alice stores peer id & address hints\nto contact Bob
Alice --> Bob: Quote response
note right: Exact XMR amount
end
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end
group Execution Setup
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group Phase A [Messages can be exchanged in any order]
Bob -> Alice: Message0
note left: Pubkeys\ndleq proof s_b\nxmr viewkey v_b\nbtc refund addr
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Alice -> Bob: Message1
note right: Pubkeys\ndleq proof s_a\nxmr view key v_a\nbtc redeem addr\nbtc punish addr
end
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group Phase B [Messages must be exchanged in the given order]
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Bob -> Alice: Message2
note left: unsigned btc lock tx
Alice -> Bob: Message3
note right: btc cancel tx sig\nbtc refund tx enc sig S_b
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Bob -> Alice: Message4
note left: btc punish tx sig\nbtc cancel tx sig
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end
end
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group Execution
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Bob ->> Bitcoin: Lock
Alice ->> Monero: Lock
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Alice -> Bob: TransferProof
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note right: xmr lock tx transfer proof\nThis can be removed if Bob watches the blockchain.
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Bob -> Alice: EncryptedSignature
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note left: redeem tx enc sig S_a
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Alice ->> Bitcoin: Redeem
Bitcoin ->> Bob: Signature
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Bob -> Bob: Extract s_a
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Bob ->> Monero: Redeem
end
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@enduml