Bitcoin P2P e-cash paper

Satoshi Nakamoto wrote: > The bandwidth might not be as prohibitive as you > think. A typical transaction would be about 400 bytes > (ECC is nicely compact). Each transaction has to be > broadcast twice, so lets say 1KB per transaction. > Visa processed 37 billion transactions in FY2008, or > an average of 100 million transactions per day. That > many transactions would take 100GB of bandwidth, or > the size of 12 DVD or 2 HD quality movies, or about > $18 worth of bandwidth at current prices. The trouble is, you are comparing with the Bankcard network. But a new currency cannot compete directly with an old, because network effects favor the old. You have to go where Bankcard does not go. At present, file sharing works by barter for bits. This, however requires the double coincidence of wants. People only upload files they are downloading, and once the download is complete, stop seeding. So only active files, files that quite a lot of people want at the same time, are available. File sharing requires extremely cheap transactions, several transactions per second per client, day in and day out, with monthly transaction costs being very small per client, so to support file sharing on bitcoins, we will need a layer of account money on top of the bitcoins, supporting transactions of a hundred thousandth the size of the smallest coin, and to support anonymity, chaumian money on top of the account money. Let us call a bitcoin bank a bink. The bitcoins stand in the same relation to account money as gold stood in the days of the gold standard. The binks, not trusting each other to be liquid when liquidity is most needed, settle out any net discrepancies with each other by moving bit coins around once every hundred thousand seconds or so, so bitcoins do not change owners that often, Most transactions cancel out at the account level. The binks demand bitcoins of each other only because they don't want to hold account money for too long. So a relatively small amount of bitcoins infrequently transacted can support a somewhat larger amount of account money frequently transacted. --------------------------------------------------------------------- The Cryptography Mailing List Unsubscribe by sending "unsubscribe cryptography" to majordomo at metzdowd.com