CAT Exchange · v0.1 draft.2Fee-aware simulator

Payment can match.
Delivery is still a choice.

Put one buyer-funded settlement under the lamp. CAT checks the exact seller amount and the declared JudgeCat service fee under one transaction signature. It never holds funds or tells the seller to ship.

Examine the evidence Read the protocol boundary
Evidence

A match is not escrow.

The verifier observes public fields. It cannot freeze, release, reverse or recover anyone’s funds.

Choice

A match is not an order to dispatch.

The seller independently decides what to do next. CAT records evidence; it does not control performance.

Privacy

Addresses stay off the public docket.

Delivery and tracking details remain private. Only a digest may prove that an unchanged private record existed.

Clerk’s examination desk

Try to fool the evidence tape.

Choose a transfer scenario. The same strict checks run every time; seller proceeds and the disclosed service fee must match together before simulated dispatch.

Choose the filed evidence

This button cannot move money or collect a fee. It sends only the chosen scenario name to the public simulator.

Exact-match sample is ready for examination.

CAT EXCHANGE · SIMULATED EVIDENCE READY FOR EXAMINATION
Direct-settlement docket

Limited Courtroom Evidence Print

Seller receives0.250 SOL
JudgeCat service fee0.001 SOL
Buyer total0.251 SOL
Buyer · payerLoading sample…
Seller · recipientLoading sample…
Filed service-fee recipient Loading sample… Signed term · simulated only
Required settlement reference CATX:loading
Chain of custody

Five clerk stations

  1. 01
    Terms filedAwaiting the clerk
  2. 02
    Both wallets authorizedAwaiting the clerk
  3. 03
    Payment examinedAwaiting the clerk
  4. 04
    Dispatch evidenceAwaiting the clerk
  5. 05
    Receipt closedAwaiting the clerk
Exact-match matrix

No almosts admitted

Docket integrityPending
Transaction signaturePending
Filed payerPending
Filed recipientPending
Network + assetPending
Exact amountPending
Service fee exactPending
One transaction · two transfersPending
CATX referencePending
Authorization windowPending
Confirmation statePending
Replay protectionPending
Clerk’s finding Select a scenario and run the tape.

No real transfer is inspected in this demonstration.

Docket digestWaiting for public simulation…
Read draft schema
From theatre to testnet

What must happen before real payment evidence.

The simulator proves the state rules are understandable. It does not prove the production payment parser is safe.

  1. Filed

    Real Authority envelope

    Buyer and seller countersign the identical devnet order using the existing CAT Authority message-signature boundary.

    Next
  2. Required

    Independent parser review

    Test seller and service-fee instructions under one signature, exact lamports, memo placement, stale blocks, reorg handling and signature reuse.

    Gate
  3. Required

    Replay-safe public registry

    A transaction signature may satisfy one docket only. Failed and reused evidence must remain blocked across restarts.

    Gate
  4. Later

    Limited devnet pilot

    Only after the gates pass would a wallet be asked to construct a direct devnet payment. Mainnet remains a separate decision.

    Future
CAT’s authority ends at the evidence

The court can verify a receipt.
It cannot make strangers trustworthy.

Open Authority pilot Read public documentation