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Does the act of broadcasting a unique transaction created by an individual result in forfeiture of any copyright claim that individual might otherwise have had on the creation of that transaction data?
Does the act of broadcasting the block of data that a miner (or pool) created result in forfeiture of any copyright claim that the miner (or pool) might otherwise have had on that block of data?
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If you voluntarily choose to broadcast your unique set of data on the open source network, knowing that it'll become part of the public ledger, then, whether or not it's something that can be copyrighted is pretty irrelevant, as no one is breaching your copyrights (you're the one who chose to make it public).
But I have serious doubt whether such data, despite being unique, is something that could be copyrighted, especially when it's strictly related to, derived from and only usable as part of an open source code/software. That's definitely not what IP protection is for.