When miners M1 and M2 compete to mine block B and miner M2 mines it just after miner M1, his mined block is called ommer/uncle/orphaned. I read that these blocks (untill sixth generation) can be included in the blockchain. Does this mean that transactions of block B are included twice?
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Related https://ethereum.stackexchange.com/questions/13378/what-is-the-exact-longest-chain-rule-implemented-in-the-ethereum-homestead-p – eth Mar 04 '18 at 21:18
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No. Only uncle block headers are included. Also when including uncles only the validity of their headers is checked, transactions are ignored. From Design Rationale:
Uncle validity requirements: uncles have to be valid headers, not valid blocks. This is done for simplicity, and to maintain the model of a blockchain as being a linear data structure (and not a block-DAG, as in Sompolinsky and Zohar's newer models). Requiring uncles to be valid blocks is also a valid approach.
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