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Dogecoin experiments

OP_RETURN transactions

OP_RETURN lets us add provably unspendable transactions with some arbitrary data appended. Commit ae767409f296d5f579c786e157d35aaee3b7104a adds some functionality to add the client version to each transaction, commit a502d8007af7ca4b9b8e925a835c30ffacd5ecee adds some patches to get this to compile on Arch Linux. See https://gist.github.com/shibefan/d11c1e089930386c19c655af0572ff71 for how to compile, resulting in:

$ ./dogecoin-qt -?
Dogecoin Core version v1.14.2.0-ga502d8007
[...]

Create a transaction and you'll find the version inside, see e.g. https://blockchair.com/dogecoin/transaction/794869adde30bf63bc28a171f25a427f3f78b250f7731ad927240eb3b51cfc30