The PFT Ledger is a next-generation decentralized blockchain designed as an immutable settlement layer for the emerging AI-agent economy. Built on battle-tested XRPL technology, the PFT Ledger uses a novel Proof of Economic Value (PoEV) consensus mechanism powered by AI agents to validate transactions and secure the network. Unlike traditional blockchains, the PFT Ledger serves as the foundation for orchestrating interactions between AI agents and human experts, creating a decentralized expert network that bridges artificial and human intelligence.

PFT is the native digital asset of the PFT Ledger, designed to facilitate value exchange in a post-fiat world where AI agents operate as autonomous economic actors. PFT enables seamless transactions between AI agents, rewards human experts for providing proprietary insights, and powers the network's unique indexing technologies that create ontologies for any asset. As the currency of choice for AI-driven financial services, PFT is built to support the complex economic interactions of an AGI-enabled future while maintaining the speed, security, and efficiency inherited from proven XRPL architecture.

The server software that powers the PFT Ledger is called postfiatd. It is a fork of rippled server. Shared code and documentation will still have mentions of rippled and XRP. Any mention of rippled applies to postfiatd and mention of XRP asset applies to PFT.

The server software that powers the XRP Ledger is called rippled and is available in this repository under the permissive ISC open-source license. The rippled server software is written primarily in C++ and runs on a variety of platforms. The rippled server software can run in several modes depending on its configuration.

If you are interested in running an API Server (including a Full History Server), take a look at Clio. (rippled Reporting Mode has been replaced by Clio.)

• Read the build instructions in BUILD.md
• If you encounter any issues, please open an issue

• Censorship-Resistant Transaction Processing: No single party decides which transactions succeed or fail, and no one can "roll back" a transaction after it completes. As long as those who choose to participate in the network keep it healthy, they can settle transactions in seconds.
• Fast, Efficient Consensus Algorithm: The XRP Ledger's consensus algorithm settles transactions in 4 to 5 seconds, processing at a throughput of up to 1500 transactions per second. These properties put XRP at least an order of magnitude ahead of other top digital assets.
• Finite XRP Supply: When the XRP Ledger began, 100 billion XRP were created, and no more XRP will ever be created. The available supply of XRP decreases slowly over time as small amounts are destroyed to pay transaction costs.
• Responsible Software Governance: A team of full-time, world-class developers at Ripple maintain and continually improve the XRP Ledger's underlying software with contributions from the open-source community. Ripple acts as a steward for the technology and an advocate for its interests, and builds constructive relationships with governments and financial institutions worldwide.
• Secure, Adaptable Cryptography: The XRP Ledger relies on industry standard digital signature systems like ECDSA (the same scheme used by Bitcoin) but also supports modern, efficient algorithms like Ed25519. The extensible nature of the XRP Ledger's software makes it possible to add and disable algorithms as the state of the art in cryptography advances.
• Modern Features for Smart Contracts: Features like Escrow, Checks, and Payment Channels support cutting-edge financial applications including the Interledger Protocol. This toolbox of advanced features comes with safety features like a process for amending the network and separate checks against invariant constraints.
• On-Ledger Decentralized Exchange: In addition to all the features that make XRP useful on its own, the XRP Ledger also has a fully-functional accounting system for tracking and trading obligations denominated in any way users want, and an exchange built into the protocol. The XRP Ledger can settle long, cross-currency payment paths and exchanges of multiple currencies in atomic transactions, bridging gaps of trust with XRP.

Here are some good places to start learning the source code:

• Read the markdown files in the source tree: src/ripple/**/*.md.
• Read the levelization document to get an idea of the internal dependency graph.
• In the big picture, the main function constructs an ApplicationImp object, which implements the Application virtual interface. Almost every component in the application takes an Application& parameter in its constructor, typically named app and stored as a member variable app_. This allows most components to depend on any other component.

Some of the directories under src are external repositories included using git-subtree. See those directories' README files for more details.

• XRP Ledger Dev Portal
• Setup and Installation
• Source Documentation (Doxygen)

• Clio API Server for the XRP Ledger
• Mailing List for Release Announcements
• Learn more about the XRP Ledger (YouTube)