State-Bound Marketplace Orders: Contract Validation and Paired Settlement for a Bonding-Curve NFT

An ordinary marketplace listing can become stale when an NFT collection changes its own issue price and redemption accounting. This source-analysis report examines NguSeaportCollection, which stages one collection-owned NFT, reconstructs a narrowly specified Seaport order through ERC-1271, and records marketplace payment and inventory transfer in transaction-scoped storage. Reserve and purchaser-supply accounting advance only after both observations are present. Direct purchases consume the same inventory sequence, and the contract rechecks the current payment amount at settlement. An isolated dependency closure of 49 Solidity files compiled successfully. The selected integration suite contains twelve test functions, but none of their bodies executed: a public RPC attempt returned HTTP 403 and the no-RPC invocation skipped at setup. Accordingly, this report presents a compiled design and source-derived properties, not a newly verified marketplace integration. It identifies the trust placed in the configured Seaport and conduit, the distinction between signature validity and live settlement checks, and the limits of reserve-based price claims. No social benefit, security proof or production deployment result is asserted. Preparation of this report was assisted by Codex. The research programme is directed toward human agency, financial inclusion, and evidence-based accountability. Intended social benefits are distinguished from measured technical results in the manuscript. The manuscript and newly authored analysis are offered under CC BY 4.0. Any supplied source files retain the license terms stated in the supplement; the record license does not replace third-party source licenses.