Bitcoin Addresses - and - Bitcoin Wallets
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"The Bitcoin blockchain is fundamentally a record of transactions between btc addresses.
"By looking at all transactions involving a given BTC address, we can determine the balance of that address. This means that an amount of bitcoin is owned by a BTC address on the BTC blockchain.
"However, a single ‘wallet’ in common software wallets these days can correspond to many different addresses. The total value of that wallet is the sum of balances of all the addresses contained in that wallet (just like how in real life a single wallet can have multiple cards in it)."