How many bitcoins would it require for a sustained DOS attack on bitcoin network?
Without transaction fee, how many bitcoins would that be?
How many transactions could we generate with 1 BTC everyday (without fee)?
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7 transactions per second times 60 equals per minute times 60 equals per hour times 24 equals per day = 604800 satoshis sent in individual transactions.
However, nodes filter such so-called "dust" transactions. The minimum output amount for a transaction to be relayed by the network is 546 satoshis. So: 330220800 satoshis = 3.302208 BTC to fill the network for a day.