> All true except that a transaction can have around 400 inputs per standard size transaction. (Author here) I'm not sure what you mean by this. A transaction

> All true except that a transaction can have around 400 inputs per standard size transaction. (Author here) I'm not sure what you mean by this. A transaction can have lots of inputs, yes, but they take up space -- in fact they are the largest part of the transaction, since they contain signature (~72 bytes), public key (~33 bytes), as well as redeemed txid+input index (32+4 bytes). The 224-byte transaction used as an example has a single input and two outputs (one destination address; one change address). A standard (pay-to-pubkey-hash) transaction with two inputs and two outputs is ~373 bytes. A 400-input (2-output) transaction would be roughly 60KB.