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From my understanding, in order to retrieve tokens on a side-chain, you would have to send your XMR to some address that would then be unlocked when you burn the side-chain tokens.

How could Monero verify that anything has actually occurred on the side-chain and unlock the XMR?

dEBRUYNE answered the following in relation to a side-chain question:

To prevent issues with the mainchain we would have to implement a cryptographic proof, i.e., the amount of XMR that went into the sidechain would have to be equal to the amount of XMR that goes back into the "mainchain".

I guess I'd like a little more explanation of what the cryptographic proof would be / how it would be implemented?

Community
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revler1082
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The proofs would be 1) a multisig 2-2 transaction initially created on the main-chain and 2) the multiple parties signing (to spend agreed balances) at settlement. What happens on the side-chain is irrelevant to the main-chain as all it need care about is the XMR are locked up in the 2-2 multisig and at some point they may be spent (so long as the signatories agree, e.g. sign).

jtgrassie
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