SPV (lightweight) users do not have a chain. (Well, some SPV users have a fraction of the full chain, but some SPV users only have block headers. Am I correct?)
If a block is created by a miner and a SPV user recieves this block, he must append this block the existing block chain, but this SPV user does not have the blockchain in this case, so what does SPV user do with a block when he recieves this?
Just attach its block header to what the SPV user has at that time?
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