Capture the Web as Evidence.
Trustworthy. Irrefutable.

1. screenshot.png: Image file capturing a visual snapshot of the web page.
2. metadata.json: Contains contextual details about the evidence, such as timestamp, URL, and browser information.
3. manifest.json: Lists all evidence files and their hashes to verify the integrity of the package.
4. manifest.sig: Digital signature for the manifest file, ensuring authenticity and integrity.
5. manifest.json.ots: OpenTimestamps proof file for the manifest.json.
6. publickey.pem: Public key used to verify the digital signature of the manifest.
7. evidence.pdf: PDF document compiling all evidence files for easy sharing and review.
8. domtextcontent.txt: Plain text content extracted from the web page's DOM.
9. page.html: Full HTML content of the captured web page.

To check the integrity of your ZIP archive, upload it to the ProofSnap Trust Verifier and click the Verify manifest button.

1. Unpacking: The ZIP archive is automatically extracted, revealing all included files.
2. Manifest check: The verifier reads manifest.json, which lists each file and its expected SHA-256 hash.
3. Hash validation: For every file, ProofSnap computes its SHA-256 hash and compares it to the value in the manifest.
4. Result display: You’ll see a list of files with their validity status:
   • Valid: The file’s hash matches the manifest.
   • Invalid: The file’s hash does not match, indicating possible tampering or corruption.

Note: ProofSnap uses the SHA-256 hashing algorithm, which ensures strong cryptographic integrity for file verification.

To verify the timestamp of your evidence using OpenTimestamps:

1. Extract the ZIP archive: Unzip your ProofSnap ZIP archive to access its contents.
2. Locate files: Find manifest.json and manifest.json.ots in the extracted folder.
3. Open OpenTimestamps website: Go to https://opentimestamps.org/
4. Upload files: On the website, upload manifest.json.ots as the timestamp proof and manifest.json as the file to verify.
5. Check verification result: The site will show whether the timestamp is valid and anchored on the Bitcoin blockchain.

Note: OpenTimestamps provides cryptographic proof that your evidence existed at a specific time, independently verifiable on the blockchain.

If you have a ZIP archive from ProofSnap and want to confirm its contents haven't been tampered with, follow these steps. ProofSnap uses the SHA-256 hashing algorithm to ensure file integrity.

1. Extract the ZIP archive: Unzip the file to access its contents.
2. Locate the manifest: Find the manifest.json file listing expected SHA-256 hashes for each file.
3. Compute the hash manually:
   • macOS / Linux: Open Terminal and run:
     shasum -a 256 <filename>
   • Windows (PowerShell): Open PowerShell and run:
     Get-FileHash -Path "<filename>" -Algorithm SHA256
4. Compare the result: Match the computed hash with the one listed in the manifest.
   • If they match: The file is valid.
   • If they differ: The file may be corrupted or altered.