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plasma in-flight exit approach
- on mainchain user starts exit with tx-data(user signed and submited) and exits with last amount(in erc20)
- user also plases a bond amount
- there is fraud-prrof if user tries to exit with fraudulent tx then operator can submit in-flight tx with same nonce
- this prevents fraud from operator side
- obviusly user won't exit with fake tx(where he is sending amount to someone) with less amount then his last accepted tx amount
- if user tries to exit with any previous tx then in-flight tx then operator or anyone with greater nonce tx can strat challenge
and get bond amount and cancels exit
- what happens when user and operator colludes ?
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