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Verifying Exchange App Publisher Signatures Before Installing

Guides · 2026-09-26

Most people install a crypto exchange app by tapping the first search result and trusting the icon. That habit is exactly what repackaged builds rely on. A repackaged app looks like the real one, asks for the same permissions, and can capture your credentials or redirect your withdrawals. The defence is not complicated, but it does require you to slow down before installing and to verify who actually signed the file you downloaded. This guide walks through how to confirm a publisher signature on desktop and mobile, how to compare a downloaded file against the checksum published by the exchange, and what details are worth recording so a later discrepancy is easy to spot. It applies whether you are installing Binance, OKX, Bybit or Bitget, and it assumes you are starting from the exchange's own help centre rather than from an app store search box. The goal is simple: know that the file came from the publisher and has not been altered since it was signed.

Start from the official download page, not a search result

Open the exchange help centre in a browser you control and navigate to the download or app section from there. Do not begin with an app store search, a link in a chat message, a QR code from a social post, or a forwarded file. Those routes are where repackaged builds circulate, because the attacker controls the destination and can present a convincing page. Once you are on the official page, note which platforms the exchange actually publishes for, and whether it offers a desktop client, a mobile app, or both.

Before downloading anything, write down three things: the page you started from, the date and time you visited, and the exact file name and version shown on the download button. If the exchange lists a checksum or signature alongside the download, copy it now rather than after the download finishes. If no checksum is published, that is itself useful information, because it means your verification will have to rely on the platform signing checks described below.

A common mistake is downloading from a page that looks official but was reached through an advertisement placed above the real result. Another is accepting a file sent by someone who says they are helping you install the app. Treat any file that arrives through a channel you did not initiate as unverified until proven otherwise, and prefer to close it and start again from the help centre.

Check the file hash against the published checksum

A checksum is a short string of characters derived from the file contents. If even one byte changes, the checksum changes. When the exchange publishes one, computing the same checksum on your download and comparing the two is the fastest way to confirm the file is intact and matches what the publisher released. On desktop systems you can generate this from the command line, and on mobile you may need a file manager or utility that displays hashes. Use the same algorithm the exchange specifies, because comparing a value from one algorithm against another tells you nothing.

Do the comparison character by character, or paste both into a text editor and compare visually in small blocks. A single transposed character is the difference between a genuine file and a tampered one. If the values do not match, stop. Do not install, do not run the installer, and do not try to work around the mismatch. Delete the file, return to the help centre, and download again, ideally on a different connection, then repeat the check.

Record the result: the algorithm used, the published value, the value you computed, and whether they matched. If you cannot find a published checksum, say so in your notes rather than assuming the file is fine. Absence of a checksum is not proof of tampering, but it does mean the signature check in the next section carries the whole weight of your verification.

Verify the platform signature on desktop installers

On desktop, the operating system itself can often tell you who signed the installer. Before running it, open the file's properties and look for a digital signature tab or an equivalent panel. You are checking two things: that a signature is present at all, and that the signer name matches the publisher of the exchange. An unsigned installer, or one signed by an entity you do not recognise, should be treated as untrusted even if the file name looks right.

If the signature is present, inspect its details rather than just reading the summary line. Confirm the certificate is valid and has not expired, and check whether the certificate chain traces back to a recognised authority. A repackaged build sometimes carries a signature from an unrelated developer, or a certificate that has already lapsed. Note the signer name exactly as shown, including any legal entity suffix, because that is the detail you will compare against the exchange's own documentation.

Record the signer name, the certificate validity dates, and the result of the check. If the operating system warns you that the publisher cannot be verified, stop and do not override the warning. Going past that prompt is the single most common way people install a tampered build, and no amount of later caution undoes it. Return to the help centre, confirm you are on the correct download page, and start over.

Verify the signature on mobile installs

On mobile, signature verification works differently because the operating system usually handles it during installation from the official store. That means the practical check shifts to provenance: confirm that the store listing you are about to install from is the one linked from the exchange's own help centre, and that the developer name on the listing matches the publisher. Read the developer name carefully, since copycat listings often use a similar but not identical name.

Before installing, review the permissions the app requests and compare them against what the exchange says the app needs. If a listing asks for access that has nothing to do with trading or account security, treat that as a signal to pause and re-check the source. Also check the update history and the listing's own support links, which should point back to the exchange's official pages rather than to an unrelated site.

If you are installing a file rather than using a store, the platform will typically refuse to install it unless it is properly signed, or will warn you that the source is untrusted. Do not disable those protections to force an install. If the exchange does not publish a direct file for your platform, that is a reason to use the store listing instead, not a reason to find the file somewhere else. Record the developer name, the store you used, and the date, so a later change in listing details is easy to detect.

Keep a verification record and re-check after updates

Write your verification results somewhere you will find them again: the download page, the version number, the checksum result, the signer or developer name, and the date. This takes a few minutes and turns a vague memory into a fact you can compare against. If the app later behaves oddly, or an update arrives that you did not expect, you have a baseline to check against.

Updates deserve the same scrutiny as first installs, because an update is just another file. When a new version appears, confirm it came through the same channel you originally verified, and check whether the signer or developer name is unchanged. A sudden change in publisher identity on an update is a strong reason to stop and verify through the help centre before proceeding.

Finally, use the exchange's account settings to review active sessions and any device or API access you have granted, and remove entries you do not recognise. If you ever suspect a build was tampered with, change your password and revoke sessions from a device you trust, then contact support through the official help centre. The verification steps above are about reducing the chance you install the wrong file; the account review is what limits the damage if something slipped through.

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