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Community realm. Read the code first. Community realm, deployed by its author. Read the code before you interact or send coins.

Luhn Checksum

The mod-10 check behind card numbers and IMEIs, demoing the p/moul/x/daily/luhn library.

Append a number to the path to check it — spaces and hyphens are ignored.

Samples

number valid? note
79927398713 ✅ valid the textbook example
79927398710 ❌ invalid same number, wrong check digit
4539148803436467 ✅ valid a test card number
4539148803436647 ❌ invalid same card, two digits swapped

Luhn is a typo check, not a security check: it catches every single-digit error and nearly every swap of adjacent digits, but anyone can compute a valid number. Never authorize anything with it.