Insights from the ZelNum team

Data Quality 5 min read

Bulk Viber Number Checker: CSV Upload and Result Export Guide

A phone list that needs Viber checks usually needs them in bulk, and bulk means the CSV becomes the deliverable. The export is not a report of what...

Data Quality 3 min read

Bulk HTX Number Checker: CSV Upload and Result Export Guide

An HTX list is a registry of account keys, and the CSV is its ledger. Each number has a role: KYC, 2FA, withdrawal, or recovery. The export has to show...

Data Quality 3 min read

How to Use HTX Number Checker for Bulk List Checks

On HTX, a phone number follows an account through its whole life: registration, KYC, trading, withdrawal, and the occasional risk freeze. At each stage...

Data Quality 3 min read

Bulk KuCoin Number Checker: CSV Upload and Result Export Guide

A KuCoin list is a registry of account keys, and the CSV is its ledger. Each number has a role: KYC, 2FA, withdrawal, or recovery. The export has to...

Data Quality 7 min read

Phone Validator Use Cases for List Hygiene and Risk Review

Phone Validator Use Cases for List Hygiene and Risk Review A phone number is only useful when somebody can act on it. Before it reaches the next system...

Data Quality 7 min read

Bulk Crypto Exchange Lookup: CSV Upload and Result Export Guide

Bulk Crypto Exchange Lookup: CSV upload and result export guide Every airdrop has the same problem. A slice of the signups aren't people at all —...

Data Quality 6 min read

How to Use KuCoin Number Checker for Bulk List Checks

How to use KuCoin Number Checker for bulk list checks Phone lists rot differently than email lists. An address either parses or it doesn't; a phone...

Data Quality 7 min read

Bulk KuCoin Email Checker: CSV Upload and Result Export Guide

Bulk KuCoin Email Checker: CSV upload and result export guide Most teams land here for one reason: a list of emails has outgrown the point where you...

Data Quality 6 min read

How to Use KuCoin Email Checker for Bulk List Checks

If a KuCoin-related list has grown past a few dozen rows, the question stops being "is this email valid?" and becomes "what do I do with each row...

Data Quality 3 min read

Best Viber Activity Checker Tools for Batch Verification

Most checkers stop at registration: is this number on Viber? For a list you actually send to, that is the wrong question. The right one is whether the...

Data Quality 5 min read

Bulk CoinW Number Checker: CSV Upload and Result Export Guide

Bulk CoinW Number Checker: CSV Upload and Result Export Guide Everything in a bulk number check rests on one quiet assumption: that your CSV survived...

Data Quality 5 min read

How to Use CoinW Number Checker for Bulk List Checks

How to Use CoinW Number Checker for Bulk List Checks Crypto number lists have a quirk that trips up people coming from regular marketing. A high...