Add sails-verifier

docs/build/sails/sails-verifier.mdx

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+---
+sidebar_label: Sails verifier
+sidebar_position: 7
+---
+
+# Sails Verifier
+
+`Sails Verifier` is a tool that checks whether a compiled program was built from the claimed source code using a trusted, reproducible environment.
+It also ensures compatibility with the Vara network by verifying that the binary matches the required versions of `Sails`, `Rust`, and system dependencies — guaranteeing predictable behavior and provable code integrity.
+
+Sails Verifier helps to:
+
+	- ✅ Ensure your program was built in the correct environment
+	- ✅ Guarantee determinism: same code = same binary = same behavior
+	- ✅ Speed up audits and integration with other tools
+
+Whether you’re a <u>developer</u>, <u>auditor</u>, or <u>simple user</u> — you can trust that the program behaves exactly as the source code says it will.
+
+## How to use it
+
+If you’re building on `Sails` — Sails Verifier should be part of your standard workflow. It helps you build safer, more reliable applications that everyone can trust.
+
+First, compile your program using the official Docker image:
+
+```bash
+docker run -v $(pwd):/app --entrypoint /bin/bash ghcr.io/gear-tech/sails-program-builder:<version> -c 'cargo build --release'
+```
+
+```info
+**Important:** Make sure to choose the Docker image version that matches the Sails version used in your project.
+```
+
+👉 Browse available Docker image versions here:
+[gear-tech/sails-program-builder](https://github.com/gear-tech/sails-program-builder/pkgs/container/sails-program-builder)
+
+Then, upload your binary and source code for verification using:
+
+![img alt](../img/sails-verifier.png)
+
+- Web interface: [gear-tech.io/verify](https.gear-tech.io/verify)
+- Technical README & API: [Github](https://github.com/gear-tech/sails-program-verifier)