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Nine conflicts, resolved as follows. src/xrpld/app/ledger/detail/InboundLedger.cpp -- kept this branch's version. phase10 sets the span's outcome/timeouts/peer_count attributes inline at each exit; this branch replaced that with the idempotent finalizeAcquireSpan(), called on all four exits (init, done, give-up, destructor). Taking phase10's blocks would have set the outcome twice against a helper documented as not overwriting what the real exit recorded. phase10's comment explains why peer_count must not be read in a destructor; the helper solves that structurally by taking std::optional<std::size_t> and being passed std::nullopt from there. src/xrpld/telemetry/MetricsRegistry.cpp -- kept metric::ledgerEconomy over phase10's "ledger_economy" literal. This branch added the naming check that requires constants for converted families, so the literal would regress it. Took phase10's comment cleanup. src/xrpld/telemetry/MetricsRegistry.h -- kept registerRotationStateGauge(), which only exists here, and took phase10's removal of the stale task-number comment. validate_telemetry.py -- combined both. phase10 replaced serial metric polling with a concurrent fan-out on one shared deadline, because 58 metrics x 45 s of additive timeout overran the CI budget; that is kept. Its target list filters on SKIPPED_METRIC_GROUPS rather than the two literals it hardcoded, so the sync_diagnostics group stays owned by assert_sync_diagnostics_metrics() instead of being polled and reported twice. Both SYNC_DIAGNOSTICS_GROUP and METRIC_POLL_CONCURRENCY are needed and both are kept. check_otel_naming.py -- both sides extend the rule docstring. Took phase10's fuller Rule E text (doc discovery, allow-dotted markers) and re-appended rules I/J/K/L, which exist only here. expected_metrics.json -- the two sides add disjoint sibling groups, so both are kept: sync_diagnostics alongside node_health_gauges, overlay_reduce_relay, overlay_overflow, validation_lifetime_counters and not_asserted. Both dashboard uids are kept, giving 16 asserted uids against 16 dashboards on disk. expected_spans.json -- kept this branch's span set, a superset that adds the acquire phase spans, ledger.serve, txset.acquire and peer.dial, and expands ledger.acquire's required attributes. Took phase10's description, which documents what the totals mean, and its note on how the RPC wildcard span is created. total_span_types and total_unique_attributes are recomputed for the union: 48 and 74, since each side's figure counted only its own spans. Docs: took phase10's more accurate wording on what the dashboard check actually covers, and corrected the dashboard count from 15 to 16 where the merge made it stale. Verified: no conflict markers remain, both JSON contracts parse, both Python files compile, asserted dashboard uids match the dashboards on disk exactly, and the OTel naming check reports all layers consistent.
The XRP Ledger
The XRP Ledger is a decentralized cryptographic ledger powered by a network of peer-to-peer nodes. The XRP Ledger uses a novel Byzantine Fault Tolerant consensus algorithm to settle and record transactions in a secure distributed database without a central operator.
XRP
XRP is a public, counterparty-free crypto-asset native to the XRP Ledger, and is designed as a gas token for network services and to bridge different currencies. XRP is traded on the open-market and is available for anyone to access. The XRP Ledger was created in 2012 with a finite supply of 100 billion units of XRP.
xrpld
The server software that powers the XRP Ledger is called xrpld and is available in this repository under the permissive ISC open-source license. The xrpld server software is written primarily in C++ and runs on a variety of platforms. The xrpld 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. (xrpld Reporting Mode has been replaced by Clio.)
Build from Source
- Read the build instructions in
BUILD.md - If you encounter any issues, please open an issue
Key Features of the XRP Ledger
- 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 fees.
- Responsible Software Governance: A team of full-time developers at Ripple & other organizations 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.
- 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: Features like Escrow, Checks, and Payment Channels support financial applications atop of the XRP Ledger. 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.
Source Code
Here are some good places to start learning the source code:
- Read the markdown files in the source tree:
src/xrpld/**/*.md. - Read the levelization document to get an idea of the internal dependency graph.
- In the big picture, the
mainfunction constructs anApplicationImpobject, which implements theApplicationvirtual interface. Almost every component in the application takes anApplication¶meter in its constructor, typically namedappand stored as a member variableapp_. This allows most components to depend on any other component.
Repository Contents
| Folder | Contents |
|---|---|
./bin |
Scripts and data files for XRPL developers. |
./Builds |
Platform-specific guides for building xrpld. |
./docs |
Source documentation files and doxygen config. |
./cfg |
Example configuration files. |
./src |
Source code. |
Some of the directories under src are external repositories included using
git-subtree. See those directories' README files for more details.