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83 lines
7.8 KiB
Markdown
83 lines
7.8 KiB
Markdown
# Adaptor Signature Swap protocol
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## WIP
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Relies on a One-Time Verifiably Encrypted Signature (OtVES) to function
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An OtVES:
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- Is a valid signature for key (a) encrypted with a public key (B)
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- Can be decrypted into a valid signature for key (a) with the private key (b) to the encrypting public key (B)
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- The encrypting private key (b) can be recovered using both the encrypted and decrypted signatures.
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Offerer - Sends the offer
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Bidder - Sends the bid
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Leader - Sends the first lock tx (ITX)
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Follower - Sends the second lock tx (PTX)
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NOSCRIPT_COIN lock tx:
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- Sent second.
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- Is sent to a combined key using a private key from each participant.
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SCRIPT_COIN lock tx:
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- Sent first
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- Requires two signatures to spend from.
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- Refund to sender txn is presigned for and can only be mined in the future.
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- Spending the refund tx reveals the leader's NOSCRIPT_COIN split private key.
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- Sender withholds signature until NOSCRIPT_COIN lock tx is confirmed.
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- spending the spend txn reveals the follower's NOSCRIPT_COIN split private key.
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```
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Offerer (Leader) | Bidder (Follower) |
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------------------------------------------------------------------------|-------------------------------------------------------------------------------|
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o1. Sends offer | |
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- x SCRIPT_COIN for y NOSCRIPT_COIN | |
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- Sends smsg OfferMessage | |
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| b1. Receives offer |
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| - Validates offer |
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| b2. Sends bid |
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| - Sends smsgs XmrBidMessage + 2x XmrSplitMessage |
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o2. Receives bid | |
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- Validates bid | |
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o3. Accepts bid | |
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- Sends smsgs XmrBidAcceptMessage + 2x XmrSplitMessage | |
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| b3. Receives bid accept |
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| - Validates |
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| - Signs for lock tx refund |
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| - Sends smsg XmrBidLockTxSigsMessage |
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o4. Receives bidder lock refund tx signatures | |
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- Sends smsg XmrBidLockSpendTxMessage | |
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- Full SCRIPT_COIN lock tx | |
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- Signature to prove leader can sign for split key | |
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- Submits SCRIPT_COIN lock tx to network | |
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| b4. Receives XmrBidLockSpendTxMessage |
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| - Validates SCRIPT_COIN lock tx and signature |
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| - Waits for SCRIPT_COIN lock tx to confirm in chain |
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| b5. Sends NOSCRIPT_COIN lock tx |
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o5. Waits for NOSCRIPT_COIN lock tx to confirm in chain | |
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o6. Sends SCRIPT_COIN lock release. | |
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- Sends smsg XmrBidLockReleaseMessage | |
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- Includes OtVES ciphertext signature for the SCRIPT_COIN lock | |
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spend tx. | |
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| b6. Receives offerer OtVES for SCRIPT_COIN lock spend tx. |
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| - Submits SCRIPT_COIN lock spend tx to network. |
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o7. Waits for SCRIPT_COIN lock spend tx. | |
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- Extracts the NOSCRIPT_COIN bidders key using the signature | |
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o8. Combines the keys to spend from the NOSCRIPT_COIN lock tx | |
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- Submits NOSCRIPT_COIN lock spend tx to network | |
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```
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Per swap (including the offer smsg):
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- Offerer sent 6 smsgs (2 extra from split messages)
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- Bidder sent 4 smsgs (2 extra from split messages)
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