---
title: "Bitcoin: A Peer-to-Peer Electronic Cash System"
description: "This paper asks how two people can agree that a digital payment happened first without asking a central mint to keep the ledger. Read it to see why signatures prove ownership but not uniqueness, how hash-linked proof of work makes one public history costly to rewrite, and why every confirmation still depends on an honest-compute majority assumption."
canonical_url: "https://fanout.sh/daily/2026-08-14-bitcoin-proof-of-work"
md_url: "https://fanout.sh/daily/2026-08-14-bitcoin-proof-of-work.md"
last_updated: "2026-08-14"
access: "public"
---

# Bitcoin: A Peer-to-Peer Electronic Cash System

This paper asks how two people can agree that a digital payment happened first without asking a central mint to keep the ledger. Read it to see why signatures prove ownership but not uniqueness, how hash-linked proof of work makes one public history costly to rewrite, and why every confirmation still depends on an honest-compute majority assumption.

## Paper details

- Authors: Satoshi Nakamoto

- Venue: Bitcoin white paper, 2008

- Track: Systems

- Difficulty: Easy

- Reading time: 35 min

- Original paper: https://bitcoin.org/bitcoin.pdf

## What you will learn

- Why a valid digital signature can authorize two conflicting transfers, leaving double-spending as an ordering problem rather than a signature problem.

- How nodes validate transactions, compete to extend hash-linked blocks, and converge on the valid branch with the most accumulated proof of work.

- Why later blocks raise the cost of rewriting a payment, how the paper models attacker catch-up probability, and where honest-majority, privacy, and light-client limits remain.

## Continue exploring

[Explore the software papers map](https://fanout.sh/blog/100-papers-to-understand-software-and-computing): Place Bitcoin beside timestamping, distributed agreement, peer-to-peer systems, CRDTs, incentives, and other papers that explain how software coordinates without one owner.

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