MARCH 10
Peer-to-Peer
When Money No Longer Needed a Middleman
The Signal
Peer-to-peer money allows two people to exchange value without requiring a central institution to approve or control the payment.
The Reading
Imagine trying to have a private conversation while every word must pass through a third person. They listen, record it, decide whether it may continue and keep a copy. Any privacy exists only because they promise not to use what they know.
Most electronic payments follow this structure. A bank or payment company stands between the sender and receiver. It can know their identities, the amount, the time and the destination. Privacy is granted by the organisation controlling it.
Bitcoin changed the structure. Two people could exchange value without a financial institution processing the payment. The sender signs a transaction and announces it to independent computers. The network checks the rules and records the transfer, but no company owns the record or grants permission.
This does not make Bitcoin transactions invisible. The public can see value moving between addresses, and those movements can sometimes be linked. Bitcoin created a different privacy model. Personal names did not need to appear in the transaction record. Peer to peer removed the institution that had to identify both parties to let them pay.
Bitcoin did not promise secrecy from everyone. It removed the compulsory observer standing between everyone.
First Principles
A transaction cannot be private from an intermediary that must inspect and approve it.
Peer to peer removes the compulsory institution between sender and receiver.
Bitcoin makes privacy possible, but users must still protect the connection between their identity and their transactions.
Today’s Challenge
Write a message on paper and seal it inside an envelope. Deliver it to someone but first give it to another person. They must open it, read it, record its contents, decide whether it may continue and keep a copy.
Can the message remain private from the system carrying it?
Now place a sealed message directly into the recipient’s hand. The information has not changed. The relationship has.
The first method required an intermediary. The second was peer to peer. Satoshi’s challenge was to create that direct relationship for digital money while still proving the money was genuine and had not already been spent.
Tomorrow’s Signal
Removing the Trusted Third Party