【区块链】Libra：Facebook的野望（二百零一）
Libra来了！Facebook在瑞士日内瓦注册的子公司Libra Network，组织了一个Libra.org，今天把白皮书发出来了。虽然之前各家公司都在以各种名义趟区块链的浑水，只有Facebook这次，才算真正地出手！
过去，严格意义上算起来，在比特币搅起的这场金融革命的战场里（或者说这个金融社会实验里）只有两个阵营：各国政府的央行体系，去中心化的区块链项目们。现在，Facebook作为一家有近30亿用户的互联网巨头，一下子出来了一个第三阵营：跨国公司们的"区块链化央行体系"。
Libra：天秤座。所以，Facebook的野望，也是和Satoshi Nakamoto们一样，想建立一个更加公平和有效率的，全面替代现有货币/金融体系的"货币体系"吗？
The goal of the Libra Blockchain is to serve as a solid foundation for financial services, including a new global currency, which could meet the daily financial needs of billions of people. Through the process of evaluating existing options, we decided to build a new blockchain based on these three requirements:
- Able to scale to billions of accounts, which requires high transaction throughput, low latency, and an efficient, high-capacity storage system.
- Highly secure, to ensure safety of funds and financial data.
- Flexible, so it can power the Libra ecosystem’s governance as well as future innovation in financial services.
Libra 区块链的目标是成为金融服务的坚实基础，包括打造一种新的全球货币，满足数十亿人的日常金融需求。通 过对现有方案的评估，我们决定基于下列三项要求构建一个新的区块链:
- 能够扩展到数十亿帐户，这要求区块链具有极高的交易吞吐量和低延迟等特点，并拥有一个高效且高容量 的存储系统。
- 高度安全可靠，可保障资金和金融数据的安全。
- 足够灵活，可支持 Libra 生态系统的管理以及未来金融服务领域的创新。
The Libra Blockchain is designed from the ground up to holistically address these requirements and build on the learnings from existing projects and research — a combination of innovative approaches and well- understood techniques. This next section will highlight three decisions regarding the Libra Blockchain:
- Designing and using the Move programming language.
- Using a Byzantine Fault Tolerant (BFT) consensus approach.
- Adopting and iterating on widely adopted blockchain data structures.
Libra 区块链就是为了全面满足这些要求，在现有项目和研究的基础上从头开始设计和构建而成的，集合了各种创 新方法和已被充分掌握的技术。下一节将重点介绍有关 Libra 区块链的三项决策:
- 设计和使用 Move 编程语言。
- 使用拜占庭容错 (BFT) 共识机制。
- 采用和迭代改善已广泛采用的区块链数据结构。
