C++ xrp-ledger Projects

rippled

101 4,453 9.6 C++

Decentralized cryptocurrency blockchain daemon implementing the XRP Ledger protocol in C++

Project mention: XRP Ledger AMM Bug Fix Now Integrated: A Detailed Analysis | dev.to | 2024-04-12

The bug occurred when a multi-path payment interacted with an AMM synthetic offer, and the synthetic offer required to fulfill the payment exceeded the AMM pool size. In this case, the payment engine attempted to use the single-path strategy to back-out the maximum liquidity available to swap against the pool. Although this condition was properly detected, there was an error on how the payment engine resized the synthetic offer to consume liquidity only up to the AMM size. Instead of using the actual swap rate, which represents the cost of fully swapping one side of an AMM pool, the new synthetic offer’s exchange rate was incorrectly set to the spot exchange rate of the AMM (that is, the rate it takes to execute an infinitesimally sized order). Consequently, an AMM operation that should have been expensive became relatively cheap, effectively violating the constant-product invariant of the pool. In this state, another user could deposit funds into the drained side of the pool, generating a large number of LP tokens and taking ownership of the pool. Now that the fix amendment is active, the team has opened a PR with a unit test demonstrating this behavior.
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NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020). The latest post mention was on 2024-04-12.