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A Telegram swap bot is hard to impersonate only when several controls work together: a public identity users can check, a bot token that never leaves your backend, webhook requests that are verified before they are read, Mini App launch data verified on the server, and a wallet flow that follows Telegram’s current developer rules. These controls establish that a request or launch really came from Telegram and from your bot. They do not establish that a swap quote, token contract, or transaction is safe. That is a separate problem, covered near the end.
Start with the question users are really asking
Most users who ask “How do I know I’m using the real Telegram swap bot?” are not asking about cryptography. They are looking at a search result or a forwarded link and wondering whether the account in front of them belongs to the project they trust. Impersonation usually works by copying a name, a profile image, or a near-identical username. The defence therefore starts with an identity that is easy to cross-check, and it continues into the server code that decides what to trust.
Build a public identity users can verify
Telegram’s bot documentation says a bot’s username is used in search, in mentions, and in t.me links, and that it cannot be changed after the bot is created. Choose the username as if you will keep it indefinitely, and avoid names that a scammer could reasonably mimic with a single extra character.
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Telegram’s Log In With Telegram guidance says users are much more likely to authorise an app when the bot has a name and logo they recognise and expect. Match the bot’s display name and profile picture to the logo on your official website, and make the name describe the service rather than a generic phrase such as “Swap Helper”.
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Publish the exact t.me link in places you control independently: the official website, the project’s announcement channel, and the support page. A user who arrives from a search engine or an advert should be able to compare the link they clicked with the one you published. Do not rely on a link that appears only inside Telegram itself, because the same surface is where impersonators post.
Telegram’s guidance also notes that official services can apply for verification, either from Telegram or from third parties. Verification is not automatic, and a bot without it is not automatically suspect. Do not describe your bot as verified until the badge actually appears on the profile.
| Identity signal | What it helps a user do | What it cannot establish |
|---|---|---|
Exact username and t.me link published on your own website and channels |
Confirm they opened the account you published | That the account is controlled by your team today |
| Name and profile image matching the website logo | Recognise the bot at a glance | Authenticity; copied images are easy to produce |
| Telegram verification badge, if granted | See that Telegram or a third party has checked the account | That the swap routes, fees, or contracts are sound |
Protect the bot token
Telegram’s introduction for developers states: “Your bot token is its unique identifier – store it in a secure place, and only share it with people who need direct access to the bot. Everyone who has your token will have full control over your bot.” For a swap bot, that means full control over messages, menus, and any payment or wallet prompts the bot sends.
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In practice, the token should live only in backend configuration or a secrets manager. It should not appear in a Mini App bundle, a public repository, a deployment log, a crash report, or a message sent to users. Restrict which team members and services can read it.
Telegram’s guidance establishes how serious a disclosure is, but it does not prescribe a detailed rotation sequence. Your incident plan should therefore be written by your team. At minimum, it should name who can revoke and replace the token, and which deployments must be updated once a new token is issued.
Verify webhook requests before reading them
If the bot receives updates by webhook, Telegram’s Bot API supports a secret_token parameter. When it is set, Telegram sends it back in the X-Telegram-Bot-Api-Secret-Token header on each delivery, which lets your server confirm the request comes from the webhook you configured. Telegram’s FAQ also suggests using a hard-to-guess path in the webhook URL as an additional aid.
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- Generate a long random value for
secret_token. The Bot API accepts letters, digits, underscores, and hyphens, up to 256 characters. - Call
setWebhookwith your HTTPS URL and the samesecret_token. Store that value in your secrets manager, not in code. - On every incoming request, read the
X-Telegram-Bot-Api-Secret-Tokenheader and compare it with the stored value using a constant-time comparison. - If the header is missing or wrong, return an error status and stop. Do not parse the body, write it to a database, or act on it.
- Deduplicate by
update_id. The Bot API reference says unsuccessful webhook deliveries may be repeated, so a handler that runs twice must not execute a swap twice.
Expected result: a test request without the header is rejected, and a request carrying the correct header is accepted and processed once. These checks confirm request origin only. They do not replace input validation, rate limits, or careful logging.
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A Mini App running inside Telegram can read Telegram.WebApp.initData, which contains the launching user’s details and a signature. Being inside Telegram is not proof of identity, because anyone can open a page or craft a request. The server must check the signature itself.
- In the client, send the raw
initDatastring to your backend without parsing and rebuilding it first. Re-encoding can break the signature. - On the server, split the query string, remove the
hashfield, sort the remainingkey=valuepairs alphabetically, and join them with newline characters. This is the data-check string. - Derive the secret key as an HMAC-SHA256 of your bot token, using the key
WebAppData. Compute HMAC-SHA256 of the data-check string with that secret key, and compare the result with thehashfield. Follow the current procedure in Telegram’s Mini Apps documentation, since the details are the authority. - Read
auth_dateand reject the launch if it falls outside a freshness window you set and document. A short window limits replay of old launch data, but it can also reject a legitimate user on a slow connection, so choose the value deliberately. - Only after all checks pass, use the user ID and other fields to create a session.
A verified launch tells you the data was signed under Telegram’s mechanism. It says nothing about whether a particular swap is correct.
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Treat the wallet as a separate trust boundary
Telegram’s Bot Platform Developer Terms, as reviewed in October 2026, state that Mini Apps with cryptocurrency wallet functionality must use TON Connect for wallet connection, authorisation, transaction signing, and sending or receiving crypto assets. The same terms allow other wallet protocols for bridging assets from other blockchains. Requirements of this kind took effect in 2025, and Telegram may revise them, so confirm the live text before you build or launch.
Telegram’s blockchain guidelines also place TON-specific limits on token issuance and blockchain functionality. If your swap spans more than one chain, state the scope explicitly in the product: which networks are supported directly through TON Connect, and which legs depend on a bridge that uses another protocol.
Keep the identity layer and the wallet layer separate in your design. A user who has successfully verified your bot still needs to see, in the wallet, exactly what they are approving.
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Show the transaction before anyone signs it
Once identity is established, the most important protection is a transaction the user can read. Before a signing request is sent to the wallet, show the asset being sold, the asset being received, the amount on each side, the destination address, the network, and any fee or slippage setting. The wallet prompt should match that summary. If your bot cannot reproduce those details, it should not ask for the signature.
Telegram’s documentation covers identity, token handling, webhooks, and wallet rules. It does not report incidence data for swap-bot impersonation or measured comparisons of transaction-review quality between services, so the controls above are design requirements rather than evidence of how often they prevent losses.
What each control does and does not prove
| Control | What it establishes | What it does not establish |
|---|---|---|
Webhook secret_token check |
The update was delivered by a webhook you configured | That the quote or instruction in the update is fair |
Signed initData check with auth_date window |
The launch data is Telegram-signed and reasonably fresh | That the destination address or contract is safe |
Exact username and t.me link |
Which bot account a user has opened | That the swap service itself is trustworthy |
| TON Connect wallet flow | The wallet connection follows Telegram’s stated rules | The token’s legitimacy or the route’s economics |
Telegram’s developer terms also note that third parties develop bots and Mini Apps. A Telegram interface does not amount to Telegram’s endorsement of any particular swap service, so your own pages should say who operates the bot and under what terms.
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If you discover a leaked token, revoke and replace it first, then update every service that uses it, and review logs for actions taken during the exposure window. If you find a lookalike account, report it through Telegram and publish the correct t.me link more prominently on your official channels. Do not rely on the lookalike’s name to tell users what happened; state the correct account and what they should do if they interacted with the copy.
Telegram’s guidance establishes why a token must be guarded closely. Your own runbook determines how quickly you can respond, so rehearse it before launch.
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