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When doing so she leaks her Monero secret key `s_a` to Bob through the magic of adaptor signatures.
6. Bob sees Alice's `Tx_redeem` on Bitcoin, extracts Alice's secret key from it and combines it with his own to spend the monero to an address of his own.
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+![BTC/XMR atomic swap protocol](https://github.com/comit-network/xmr-btc-swap/blob/readme/BTC_XMR_atomic_swap_protocol.svg)
We define: