basicswap/doc/protocols/seller_first.md

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# Seller first protocol
Seller sends the first transaction.
Both coin types must support scripts.
1. Seller posts offer.
- smsg from seller to network
coin-from
coin-to
amount-from
rate
min-amount
time-valid
2. Buyer posts bid:
- smsg from buyer to seller
offerid
amount
proof-of-funds
address_to_buyer
time-valid
3. Seller accepts bid:
- verifies proof-of-funds
- generates secret
- submits initiate tx to coin-from network
- smsg from seller to buyer
txid
initiatescript (includes pkhash_to_seller as the pkhash_refund)
4. Buyer participates:
- inspects initiate tx in coin-from network
- submits participate tx in coin-to network
5. Seller redeems:
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- constructs participate script
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- inspects participate tx in coin-to network
- redeems from participate tx revealing secret
6. Buyer redeems:
- scans coin-to network for seller-redeem tx
- redeems from initiate tx with revealed secret