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This tag should be used for questions pertaining to the blockchain. The blockchain is a list of all transactions that have occurred using the Bitcoin currency. It consists of blocks which are linked to each other, and each block consists of transactions. DON'T USE THIS FOR THE SERVICE NAMED 'blockchain.info'!

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How does a miner verify that the funds are available and not already spent without iterating through the entire Blockchain? … In order to know all the unspent transaction output you need the entire blockchain. This is what "full nodes" do. Full nodes look at the entire blockchain all the way back to the genesis block. …
answered Nov 18 '21 by hft