Atomic swaps

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Atomic swaps
In general, the scheme of atomic swaps in two independent blockchains looks as follows:
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sequenceDiagram
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    participant Alice
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    participant Chain 1
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    participant Chain 2
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    participant Bob
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    Note over Alice: secret = 'random'
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    Note over Alice: hash = h(secret)
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    Alice ->>  Chain 1: announces TX1(hash)
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    Note over Chain 1: TX1 waits for secret
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    Alice -->> Bob: tells hash
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    Bob ->> Chain 2: announces TX2(hash)
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    Note over Chain 2: TX2 waits for secret
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    Alice ->>  Chain 2: announces TX3(secret, hash)
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    Note over Chain 2: TX2 executes
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    Note over Chain 2: secret becomes public
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    Note over Chain 2: Alice receives funds
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    Bob ->>  Chain 1: announces TX4(secret, hash)
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    Note over Chain 1: TX1 executes
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    Note over Chain 1: Bob receives funds
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Transactions in Nimera Blockchain
BeginSwap - Begin exchange operation (signed by the sender)
sender - sender
target - recipient
timestamp - expiration time
alg - hashing algorithm
hash - hash
?DATA (amount, color, etc) - data about the frozen funds
CommitSwap - complete the exchange operation (does not require a signature)
hash - hash of the secret as exchange operation identifier
secret - secret phrase
sender - exchange initiator
target - recipient
RollbackSwap - Roll back an exchange operation (does not require a signature)
hash - hash of the secret as exchange operation identifier
sender - exchange initiator
CancelSwap - Cancel the exchange operation (signed by the sender and recipient).
hash - hash of the secret as exchange operation identifier
sender - exchange initiator
target - recipient
How it works
Diagram of the asset flow within a single network:
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graph TD
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  Alice((Alice)) -- BeginSwap --> swap
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  swap -- CancelSwap --> Alice
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  swap -- CommitSwap --> Bob((Bob))
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  swap -. time .-> expired_swap
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  expired_swap -- RollbackSwap --> Alice
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​
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  expired_swap -- CancelSwap --> Alice
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BeginSwap initiates the exchange operation by freezing the funds in the sender's account. To do this, coins are deducted from the account and information about the operation (secret, lifetime, deducted amount, etc.) is being recorded in the account in a special field with unfinished exchanges.
CommitSwap unfreezes the funds and transfers them to the recipient. For this purpose, the secret, whose hash was specified earlier, is provided before the expiration of the exchange operation. In fact, the operation adds the transaction amount to the recipient's balance (it was deducted from the sender when the exchange was created), and then the information about the incomplete operation gets deleted from the sender's account.
CancelSwap cancels operations by mutual consent. It can be performed at any time, including before the exchange expires. This is an optional operation.
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Last modified 6mo ago
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Transactions in Nimera Blockchain