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On 16 August 2015 17:03:35 GMT-07:00, Cameron Garnham via bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org> wrote:
>There are a few ways: here is my favorite (for the moment).
>
>1. Spam the 8mb blocks with 1 Satoshi outputs to the brainwallet
>'BitcoinXT'

Even more direct: use coinbase outputs of  XT blocks to create those outputs, as they can't by definition be on the Bitcoin chain.

If you can't get those, using coinbase outputs of Bitcoin blocks to create "definitely Bitcoin-only" outputs, and then spend the inputs to those transactions again on the XT chain. This isn't quite as good, as a big reorg on the XT chain could in theory spend them, but it's a close second.
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