D-KaP Pay (part of EpochCore's sealed-evidence product line) gives every regulated payment you settle on Base — a public Ethereum-compatible blockchain known as Base Layer 2 — a tamper-evident seal. The sender, the recipient, and any future regulator all get the same verifiable proof of what was paid, when, and to whom.
On-chain payment is fast, cheap, and final — until your auditor or regulator asks for proof. The blockchain shows a transaction. It does not show the human-readable context: who initiated, against what invoice, under which compliance regime, with what counterparty due-diligence already on file. You hand over the transaction hash, the auditor opens a ticket asking for the surrounding context. Now you are pulling logs from your wallet, your ERP, your KYC vendor, and your treasury team — all separately, none of them mutually attested.
Pay sits between your treasury system and the blockchain. When you initiate a regulated on-chain payment, you POST the payment details (amount, counterparty, invoice reference, compliance regime, sender approval chain) to a single endpoint. The service settles the transaction on Base L2 and seals the full payment record — both the on-chain transaction and the off-chain context — with a tamper-evident triple signature. Both sides of the payment receive an identical sealed receipt. Months or years later your auditor, the counterparty, or a regulator opens any one of those receipts and verifies it independently against our public root. The on-chain transaction is the spine; the sealed receipt is the body.
POST the payment details (amount, counterparty wallet, invoice number, internal approval chain, compliance regime) to the Pay endpoint with your API key. No on-chain dust required — the service settles for you.
Within seconds, you receive the sealed receipt and the on-chain transaction hash. The counterparty wallet receives an identical receipt. Both sides now hold verifiable evidence of the same payment.
When an auditor, regulator, or counterparty asks for payment evidence, hand them the receipt. They run the open verifier, confirm signatures, and cross-check the on-chain hash. Done in minutes, not days.
Example: A digital-asset asset manager pays a regulated vendor $48,000 in USDC for quarterly services. Using Pay, the treasury lead initiates the payment with the invoice reference, internal approval chain, and counterparty due-diligence ID attached. Both the asset manager's wallet and the vendor's wallet receive matching sealed receipts. Eight months later the asset manager's auditor requests evidence of all Q3 vendor payments. The treasury lead exports the receipts; the auditor verifies them against the public root and cross-checks the on-chain transaction hashes on Basescan. The whole reconciliation takes under 30 minutes for the full quarter.
Reconciling on-chain payments against off-chain compliance context typically costs $200 to $800 per payment in audit and treasury overhead — mostly chasing approval chains, due-diligence files, and invoice references across separate systems. One $99 seal eliminates the chase. The receipt carries everything the auditor needs, signed at the moment of payment. For firms processing dozens of regulated on-chain payments a month, the math works after the first quarterly audit cycle.
Adds an invisible stealth watermark keyed to your firm on the exported receipt. The watermark survived 90 of 136 measured attack vectors in our test matrix at SSIM 0.985 (visually identical to the original) with zero false-positive matches. Stays attached through screenshots and re-uploads. If a receipt ever leaks or surfaces in a dispute, you have a machine-readable trace back to your firm. Not "uncopyable" — a determined attacker can still scrub it — but tamper-evident in the ways auditors, counterparties, and litigation counsel actually care about. MEASURED