The secret life of Bank Codes
summary
Maintains an open source IFSC database and API (https://ifsc.razorpay.com) with monthly, RBI-aligned releases and automated publishing. Validates over 150,000 IFSCs quickly using a bloom filter (≈1% false positives) and reduces disk and human-readability problems with a lightweight custom compression scheme. Publishes cleaned CSV/JSON derived from RBI spreadsheets, tracks sublet branches, runs in production for more than a year, and documents quirks that break naive validators.
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