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A Telegram swap bot is hard to impersonate when four controls work together: users can recognize one canonical bot identity, the bot token stays under backend control, every webhook update and Mini App launch payload is authenticated on your server, and the wallet step follows the wallet protocol Telegram’s developer rules require. These controls establish who is talking to your service and that the requests were not forged. They do not prove that a swap route, token contract, quote, or transaction is safe. That requires separate checks, covered near the end of this article.
Give users one identity they can check
Impersonators copy names and profile pictures far more easily than they can copy your infrastructure, so the identity your users see has to be deliberate and published in places you control.
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Choose the username and publish one link
You create a bot by messaging @BotFather in Telegram and sending /newbot, as described in Telegram’s bot introduction for developers. The username you pick becomes part of the bot’s t.me link and is used in search and mentions. Telegram’s bot documentation describes the username as fixed once the bot is created, so choose it with the long term in mind and confirm the current BotFather behavior before planning any rename.
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Publish the exact t.me link on your website, documentation, and official support channels. Users should be able to compare the username they see in Telegram against a single canonical reference. A link that appears in several slightly different forms is harder to verify than one link repeated consistently.
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Match the name and logo to your website
Telegram’s Log In With Telegram guidance recommends a bot picture that corresponds to the website logo and a bot name that reflects the connection to the service. It also notes that users are more likely to authorize an app when the bot has a name and logo they recognize and expect. Use the same wordmark and logo on the website, in the bot profile, and in the Mini App header.
Treat matching art as a consistency cue, not proof. Lookalike bots can copy a logo and a similar name, so the username and link remain the reliable check.
Verification is not automatic
Telegram’s guidance says official services can apply for verification, either through Telegram or through third parties. Do not describe your bot as verified unless that status is visible to users and you have confirmed it. The absence of a badge is not evidence of fraud, and a badge is not evidence that a swap is sound.
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Telegram hosts third-party bots
Bot accounts and Mini Apps on Telegram are built and operated by third parties. The Telegram interface around a bot does not mean Telegram endorses that service. Say so in your own documentation so users do not read the platform’s presence as a guarantee.
Protect the bot token
Telegram describes the bot token as the bot’s unique identifier and states that anyone who has it will have full control over the bot. The rules that follow from that are straightforward:
- Keep the token only in backend configuration or a secrets manager on trusted infrastructure.
- Never place it in Mini App JavaScript, because anything shipped to the browser should be treated as public.
- Keep it out of public repositories, application logs, error messages, and any message a user can see.
- Limit which people and services can read it, and record who has access.
- Maintain a written procedure for replacing the token and updating every deployment that uses it.
Telegram’s documentation establishes how serious a leaked token is. It does not supply a detailed rotation runbook, so write your own and rehearse it before you need it.
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Authenticate webhook requests
If your bot receives updates by webhook, your server should accept only requests that Telegram sent through the webhook you configured. The Bot API supports a secret_token parameter for this purpose.
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setWebhook, pass asecret_tokenthat you generate for this purpose. Use a long random value made of the characters the Bot API allows. - Store that value in backend configuration, not in source code.
- On every incoming request, read the
X-Telegram-Bot-Api-Secret-Tokenheader and compare it with your stored value using a constant-time comparison. - If the header is missing or does not match, return a non-success status and do not parse the body as an update.
- Optionally, place the webhook at a path that is difficult to guess. Telegram’s FAQ suggests a secret path as an authenticity aid.
- Make update handling idempotent. The Bot API may redeliver an update when a delivery is not acknowledged, so track processed update identifiers and skip repeats.
The header check tells you the request came through the webhook you configured. It does not validate the content of an update, and it does not replace input validation, rate limits, or careful logging.
Validate Mini App launch data on the server
Being inside Telegram does not make a user ID trustworthy. A Mini App should send the raw launch string to your backend, and the backend should verify it before creating a session.
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- In the Mini App, send the raw
Telegram.WebApp.initDatastring to your backend. Do not send only a parsed user object, because the parsed object cannot be verified. - Split the string into key-value pairs, remove the
hashpair, sort the remaining pairs alphabetically by key, and join them with newline characters. The result is the data-check string. - Derive a secret key by computing HMAC-SHA256 over your bot token, using the fixed key
WebAppData. - Compute HMAC-SHA256 of the data-check string using that secret key, and compare the hexadecimal result with the
hashvalue using a constant-time comparison. - Read
auth_date, which is a Unix timestamp in seconds, and reject the launch data if it is older than your freshness window. The window is your design decision; a window measured in minutes limits replay of stale launch data. - Only after these checks pass, read the user identifier and other fields and create the session.
Confirm the exact procedure against Telegram’s current Mini Apps documentation before you implement it, because the details are part of the signature contract.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Keep the wallet step inside Telegram’s crypto rules
Telegram’s developer terms require Mini Apps with cryptocurrency wallet functionality to use TON Connect for wallet connection, authorization, transaction signing, and sending or receiving crypto assets. Other wallet protocols are permitted for bridging assets from other blockchains. Telegram’s blockchain guidelines also impose TON-specific limits on token issuance and blockchain functionality.
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What each control proves and what it does not
The controls above answer specific questions. Treating any one of them as a broader guarantee is the most common way a design becomes weaker than it looks.
| Control | What it establishes | What it does not establish |
|---|---|---|
| Canonical username and t.me link | Users can reach the bot at the address you published | That the service is solvent, audited, or safe to trade with |
| Bot token kept on the backend | Only your infrastructure can act as the bot | That your swap logic or pricing is correct |
Webhook secret_token check |
The update arrived through the webhook you configured | That the update content is valid or safe to execute |
initData signature and auth_date check |
The launch data was issued by Telegram and is recent | That a transaction is valid or that a contract behaves as described |
| TON Connect wallet flow | Wallet connection and signing follow the protocol Telegram’s rules require | That the quote, token, or destination address is correct |
What users should check before signing
Identity controls reduce the chance that a user is talking to a copy of your bot. They do not tell the user whether the transaction in front of them is what they intended. Design the confirmation step so the user can read the following before approving in their wallet:
- The token being sold and the token being received, with the exact amounts.
- The network the transaction runs on, and whether it matches the network in the wallet.
- The destination address, shown in full or with a clear comparison option.
- Fees and the minimum amount the user will receive, with the slippage setting that produces that minimum.
No legitimate swap flow needs a user’s seed phrase or wallet recovery phrase. If a bot or Mini App asks for one, stop and do not continue.
Summary of the design
Build the bot so its identity is published in one place, store its token only on the backend, reject webhook requests that lack the correct secret header, verify Mini App launch data cryptographically and by age, and route wallet actions through TON Connect as Telegram’s rules require. Then make the transaction itself legible to the user, because the controls above authenticate the channel, not the trade.
Quick Recap
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