Try to make it pay twice

Release and refund compete for the same agreement version. One reserves the outcome; the other stops before it can create a second payment.

Race outcomeRelease won · one settlement

WinnerRelease reserved the settlement

Competing commandRefund was rejected

Ledger resultOne transaction · 2 postings

Terminal Race

Two commands. One lock. One settlement.

Releaseevt_5r7s0dh0qw7a3qqcdaet1fby1s

Settlement reservedop_35nr8sfws7w9zvq9nx1s3day8r

Refundevt_n48xnqkx5nnjv4x23pfab49ydbbw27rtc5gy065y5cf5yrc8kq7g

Rejected: agreement already changedSTALE_AGREEMENT_VERSION · no second ledger posting

single downstream rail

Ledger transaction · 2 postingsTransaction ID 3agreement:agr_77z3yxatmfwjqeb17v9h63vf9p:event:evt_5r7s0dh0qw7a3qqcdaet1fby1s

Accessible event table

Terminal Race event outcomes and downstream effects
Lane	Event	Version	Decision	Operation	Ledger transaction
Release	evt_5r7s0dh0qw7a3qqcdaet1fby1s	2	TERMINAL_INTENT_RESERVED	op_35nr8sfws7w9zvq9nx1s3day8r	3
Refund	evt_n48xnqkx5nnjv4x23pfab49ydbbw27rtc5gy065y5cf5yrc8kq7g	2	STALE_AGREEMENT_VERSION	None	None

Run it live

Read-only

The public tour is read-only so the stored evidence stays stable. With a sandbox key you can start a real race here and watch new evidence persist.

Sandbox control key

Presenter tools are locked.

Showing the stored completed race.

Run identities and exact hashes

Run: run_4sdrhqcs7zt0zrfw3x7e7mgnrs
Result hash: sha256:09715281ce9e3976461cfa0d233e1ccbbf53e8e4b5d22cd25cecd5d74ba3d8c7
Operation: op_35nr8sfws7w9zvq9nx1s3day8r
Replay: Exact identity replay

Every command the runtime received, in the order it received them, and why each was accepted or rejected.

FUNDevt_2p0kffb0qen6jxxgan54072m6g · expected v0 · 2026-07-20T17:00:00.000Z
ACCEPTED
SUBMIT_DELIVERYevt_727smm57e7e75mdjgkr2av4y74 · expected v1 · 2026-07-20T17:00:00.000Z
ACCEPTED
ACCEPT_DELIVERYevt_5r7s0dh0qw7a3qqcdaet1fby1s · expected v2 · 2026-07-20T17:59:59.999Z
ACCEPTED
DEADLINE_EXPIREDevt_n48xnqkx5nnjv4x23pfab49ydbbw27rtc5gy065y5cf5yrc8kq7g · expected v2 · 2026-07-20T18:00:00.000Z
STALE_AGREEMENT_VERSION