📄️ Dual-Signature Pattern
Every operation in the Stablecoin Stack requires exactly two independent ECDSA signatures. They serve different purposes, are verified by different components, and protect against different classes of attack. Neither is sufficient alone.
📄️ Fee Model
Every payment processed by the Settlement Contract is subject to up to two fee components. Understanding the fee model is essential for checkout integrations: the amount the payer signs in their permit must be the total with fees, not the principal alone.
📄️ Payment Flow
This document describes the complete end-to-end payment flow — from charge creation by the merchant to final settlement confirmation delivered to both merchant and payer. It is written as a narrative to build intuition. Normative requirements for each step are in the formal specification.
📄️ Permit-Based Payments
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📄️ System Architecture
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📄️ Why Cryptographic Payments
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