4 results
Check-digit mathematics toolbox for DeepSeek Harness (dsh): generate, validate and detect check digits for Luhn, Verhoeff, Damm, ISBN-10/13, EAN-8/13, UPC-A, ISIN, CUSIP, IBAN, CAS Registry Number and ABA routing number, plus ISBN-10 <-> ISBN-13 conversion — zero runtime dependencies
Offline identifier checks and Chinese money/tax arithmetic. Checksum-verified identifiers (mainland ID, USCC, bank card, plate, VIN, ISBN, IMEI, IBAN, EAN/UPC) plus amount-in-words, IIT, VAT, mortgage schedules and 调休-aware workday counts.
Cross-border commerce: HS codes, customs invoices, mainland reachability. HS/HTS code lookup and classification, commercial invoices, live exchange rates, IBAN and EAN/UPC checks, amount-in-English for documents, and whether your site is actually reachable from inside mainland China.
数据校验（邮箱/手机/Luhn/IBAN/URL）