Discussion

Why the Bitcoin ledger is potentially so important

BrettScott:

"Banks are information intermediaries. Gone are the days of the merchant dumping a hoard of physical gold into the vaults for safekeeping. Nowadays, if you have ‘£350 in the bank’, it merely means the bank has recorded that for you in their data centre, on a database that has your account number and a corresponding entry saying ‘350’ next to it. If you want to pay someone electronically, you essentially send a message to your bank, identifying yourself via a pin or card number, asking them to change that entry in their database and to inform the recipient’s bank to do the same with the recipient’s account.

Thus, commercial banks collectively act as a cartel controlling the recording of transaction data, and it is via this process that they keep score of ‘how much money’ we have. To create a secure electronic currency system that does not rely on these banks thus requires three interacting elements. Firstly, one needs to replace the private databases that are controlled by them. Secondly, one needs to provide a way for people to change the information on that database (‘move money around’). Thirdly, one needs to convince people that the units being moved around are worth something.

To solve the first element, Bitcoin provides a public database, or ledger, that is referred to reverently as the blockchain. There is a way for people to submit information for recording in the ledger, but once it gets recorded, it cannot be edited in hindsight. If you’ve heard about bitcoin ‘mining’ (using ‘hashing algorithms’), that is what that is all about. A scattered collective of mercenary clerks essentially hire their computers out to collectively maintain the ledger, baking (or weaving) transaction records into it.

Secondly, Bitcoin has a process for individuals to identify themselves in order to submit transactions to those clerks to be recorded on that ledger. That is where public-key cryptography comes in. I have a public Bitcoin address (somewhat akin to my account number at a bank) and I then control that public address with a private key (a bit like I use my private pin number to associate myself with my bank account). This is what provides anonymity.

The result of these two elements, when put together, is the ability for anonymous individuals to record transactions between their bitcoin accounts on a database that is held and secured by a decentralised network of techno-clerks (‘miners’). " (http://furtherfield.org/features/articles/visions-techno-leviathan-politics-bitcoin-blockchain)