XRPL tries to mathematically prove its new lending market cannot be drained

XRP Ledger (XRPL) developers are using mathematical proofs to test whether the network’s forthcoming lending market can be drained or become insolvent.On Sept. 17, protocol research firm Common Prefix said it is formally verifying XRPL’s Lending Protocol with Lean 4, a theorem-proving language designed to establish whether software satisfies defined mathematical properties across possible system states.The firm said the work is intended to show that the protocol cannot enter states that violate its accounting and safety rules.The work has taken on greater significance after xrpld version 3.4.0 shipped this week with LendingProtocolV1_1, an amendment that introduces closed-ended lending vaults and cash-basis accounting. The amendment is included in the server software but still requires approval through the XRP Ledger’s amendment process before taking effect.XRPL’s lending design would allow depositors to pool assets that loan brokers can deploy into fixed-term, uncollateralized loans. Borrower underwriting and credit assessment happen off-chain, while the ledger records loan origination, repayments, and accounting.That puts a premium on getting the protocol’s internal bookkeeping r...