D-KaP Echo (part of EpochCore’s sealed-evidence product line) reproduces any previously sealed event back to a regulator—subpoena, SEC inquiry, audit request—with the original signatures and chain-of-custody intact. The replay is the original, byte-for-byte, with proof.
You sealed an event three years ago. Today the SEC subpoenas your records about that trade, that approval, that customer communication. You can find the event in your system—but the version you produce to the SEC has to be the same event, byte-for-byte, with the original timestamps and signatures still verifiable. Not a re-export, not a regenerated PDF, not “here’s what we have in the system today.” The signed original.
Most records systems can’t prove this. They produce a copy and ask the regulator to trust it. When a regulator doesn’t trust it, you spend months explaining your data architecture.
D-KaP Echo replays any sealed event you previously submitted to any D-KaP endpoint, reconstituting the original signed record exactly as it existed at seal time. The replay carries the original triple cryptographic signature, the original timestamp, and a full chain-of-custody log showing every time the event has been retrieved. The SEC examiner’s verification check on the replay is the same check they’d run on the original—and it passes for the same reason: it’s the same record.
Pull the event ID from the original seal receipt (or look it up by date, document, ticket reference, or counterparty). If you sealed the event through any prior D-KaP product—Seal, Inspect, Audit, Record, anything—the original signed record is recoverable.
/echoSubmit the event ID plus a short purpose statement (“SEC subpoena docket 24-XXXX” or “OCR investigation case 12345”) to the D-KaP endpoint. The purpose statement is recorded in the chain-of-custody log so future regulators can see who retrieved what and why.
The service returns the original sealed event, the chain-of-custody log, and a cover letter. Forward the package to the regulator. They run signature verification once, see the original signatures from years ago verify cleanly, and the production is closed.
Example: An RIA receives an SEC subpoena referencing investment-committee decisions from 31 months prior. The CCO finds the 14 sealed committee minutes in the archive (sealed at the time via D-KaP Seal), runs each through /echo with the docket number as the purpose statement, and sends the replay package to the SEC. The SEC’s verification check sees that the signatures are 31 months old and still verify against the trust root from that date. The records are accepted on first review. Total time from subpoena receipt to production: under an hour.
Responding to an SEC subpoena or FINRA exam request typically consumes 40–120 hours of compliance and legal staff time, much of it spent justifying the integrity of produced records. $29 per replayed event is less than one minute of outside-counsel time and replaces hours of internal back-and-forth. The price is structured for the moment you need it most—when the deadline is short, the regulator is impatient, and you need the production to go out clean the first time.
The same replayed event, plus the regulator-ready cover letter PDF carries an invisible stealth watermark keyed to your trust root. The watermark adds a second, image-layer chain of custody on the cover letter—useful when the production gets re-screenshotted into the regulator’s workpapers, attached to a court filing, or shared with outside counsel. Measured to stay attached through screenshots, JPEG compression, and scaling (90 of 136 attack vectors survived, false-positive rate zero, SSIM 0.985). Not “uncopyable”—the watermark layer can be stripped—but tamper-evident in the ways regulators actually care about. MEASURED