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Cinder / Documentation

Guaranteed XRP execution.
Proven both ways.

Cinder is a private RFQ rail for buying native XRP. Buyers escrow USDT0, makers compete through sealed quotes and lock FXRP performance bonds, and Flare Data Connector proves delivery or non-payment.

Coston2 liveChain 114XRPL TestnetUSDT0 escrowFXRP bondsDual FDC outcomes
01 / Product

The brokerless guarantee

Cross-chain XRP trades normally make one side move first. Cinder replaces that trust gap with escrow, competition, collateral and objective proof.

A buyer locks USDT0 and commits an XRPL destination. Independent makers lock FXRP bonds and submit sealed prices. The lowest revealed quote inside the live FTSOv2 band wins. If XRP arrives, FDC releases USDT0 and returns the bond. If it does not, FDC refunds the buyer and slashes the bond.

Flare is the product infrastructure.

Coston2 owns the state and funds, FTSOv2 defines a fair execution band, FXRP supplies native performance collateral, and FDC resolves both cross-chain outcomes without a Cinder operator.

02 / Architecture

Five modules with narrow responsibilities

01 / ESCROWUSDT0 custody

Holds buyer funds and applies the final outcome.

02 / MATCHERSealed auction

Domain-separated commit and reveal competition.

03 / BONDSFXRP vault

Locks, returns or slashes maker collateral.

04 / PRICEFTSOv2 guard

Rejects quotes outside a 1.25% live band.

05 / PROOFDual FDC adapter

Validates payment and referenced non-existence.

Matcher boundary

The guaranteed escrow calls a separate matcher contract. Commit-reveal V2 is the deployed, reliable implementation. An FCC matcher can later implement the same role without rewriting escrow, bond or FDC logic. FCC is not claimed as live because its local runtime was unavailable.

03 / Testnet guide

Run and verify the demo

  1. Open Live proofs. Select Payment delivered or Payment missed.
  2. Click Verify receipts live. The page reads Coston2 receipts directly.
  3. Open the hashes. Inspect USDT0 escrow, maker competition, FDC request and resolution.
  4. Inspect XRPL. The success path links to the validated 2 XRP transaction with the RFQ payment reference.
  5. Create your own hash. In the isolated sandbox, connect a test wallet, claim dcUSD and create a fresh RFQ.

Asset separation: the guaranteed reference uses official Coston2 USDT0 and FXRP. The public sandbox uses an isolated one-claim dcUSD token so judges can transact without controlled maker keys or scarce FXRP faucet balances.

Launch demo
04 / Evidence

Real success path: RFQ #3

EventNetworkTransaction
2 USDT0 escrow createdCoston20x784b...c78d
Two quotes finalizedCoston20x4077...198c
2 XRP deliveredXRPL TestnetEE8A...8267
Payment proof requestedFlare FDC0x7731...0caf
USDT0 released; bond returnedCoston20x056a...9ddf

Real default path: RFQ #1

EventNetworkTransaction
2 USDT0 escrow createdCoston20x9072...312d
Winning maker selectedCoston20x9a21...e43f
Non-payment proof requestedFlare FDC0x65df...1bfe
USDT0 refunded; 1 FXRP slashedCoston20x5e81...0837
05 / Deployments

Live Coston2 contracts

ComponentAddress
Guaranteed USDT0 escrow0x27DAa2d5BfDD9A3C7657baDc59E91c3649f14744
Commit-reveal matcher V20x166aB7D743Fc71dAd7Dba19957fd3465531b6AE0
FXRP bond vault0xE0095bA27bce7a8c82eBf0e00F1C54eF552737CF
Dual FDC adapter0x662bEAf80369aa2A2b9BAcd17cd5dDbA8Ec15B01
FTSOv2 XRP/USD adapter0xcB10895076A8a2b5E2e719CEd7fC43f906Af60BF
USDT00xC1A5B41512496B80903D1f32d6dEa3a73212E71F
FXRP0x0b6A3645c240605887a5532109323A3E12273dc7
06 / Evidence of new work

Built during the program

  • USDT0-only guaranteed escrow with independent matcher and bond interfaces.
  • FXRP bond vault with one-time controller binding, release and slash accounting.
  • Two-maker domain-separated commit-reveal matcher V2.
  • Dual FDC adapter for Payment and ReferencedPaymentNonexistence proofs.
  • Checkpointable proof keeper that survives RPC resets without duplicating requests.
  • Automated real XRPL payment path and both Coston2 resolution paths.
  • Public proof console plus isolated wallet transaction sandbox.
07 / Next steps

Path beyond the hackathon

  • Security audit and invariant/property testing for escrow and bond accounting.
  • Maker onboarding, quote API and monitoring for production liquidity.
  • USDT0 and FXRP liquidity pilots with XRP payment businesses.
  • FCC matcher adapter once the runtime is dependable, without changing settlement contracts.
  • Flare Mainnet deployment after audit and controlled treasury pilot.

Local verification

npm install
npm run contracts:check
npm test
npm run guaranteed:auction
npm run guaranteed:pay
npm run guaranteed:keeper
# or after a missed deadline
npm run guaranteed:default