Bondify verifies Telegram logins locally via HMAC, eliminating third-party API round-trips

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Bondify is an authentication service that lets servers verify Telegram-based logins without making a network call back to Bondify's API. Instead of querying a remote endpoint, the system issues a signed JWT proof using HS256, where the signature is generated with a shared webhook secret known only to the developer's server and Bondify. When a user confirms login through a Telegram bot, the resulting proof can be validated locally with a single cryptographic check using any standard JWT library. This approach means login verification latency depends solely on the developer's own infrastructure, and previously confirmed sessions remain verifiable even if Bondify experiences downtime. A single webhook secret manages both proof verification and webhook signature validation, reducing secret management overhead for developers.

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