Verification Methods

A vBase stamp proves that your file or content existed on or before the date/time it was recorded on a public blockchain. Stamp verification requires you only to possess a copy of the underlying content/file.

Why This Matters

Traditional approaches to proving authenticity depend on centralized databases or storing receipts that can be lost, altered, or disputed.

With vBase:

• Verification is independent — anyone can check a file against the blockchain.

• There’s no single point of trust (no company-controlled registry you must rely on).

• There’s no need to keep track of certificates or receipts — the blockchain record itself is the proof.

This makes vBase the only tool that delivers reliable, permanent verification of content authenticity without relying on an intermediary.

Quick Reference

Method	Category	Input Needed	Where to Verify
Method 1	With vBase	Original file	vBase Verify
Method 2	With vBase	ContentID (hash)	https://app.vbase.com/verify?cid=<ContentID>
Method 3	Without vBase	SHA3-256 hash	Dune dashboard
Method 4	Without vBase	Transaction ID	PolygonScan
Method 5	Without vBase	ContentID, address, timestamp	vBase Smart contract
Method 6	vBase API	ContentID (hash)	REST API docs
Method 7	vBase API	ContentID (hash)	Python SDK docs

What You’ll Need

• The original file that was stamped

• The hashing algorithm used. By default vBase uses SHA3-256

With vBase Tools

Method 1: vBase Verify (Recommended)

1. Go to app.vbase.com/verify.

2. Upload your file.

3. vBase computes the SHA3-256 hash and checks it against the blockchain record.

4. If a matching stamp is found, you’ll see:

   • The timestamp (UTC)

   • The transaction ID

   • The blockchain address

Method 2: Verify via ContentID

1. Compute your file’s SHA3-256 hash using any hashing tool (e.g., emn178 SHA3-256 tool) or using the OpenSSL library.

2. Copy the ContentID (hash) and append it to the verify URL:

   https://app.vbase.com/verify?cid=<ContentID>

Without vBase Tools

Method 3: Dune Dashboard

1. Compute your file’s SHA3-256 hash using any hashing tool (e.g., emn178 SHA3-256 tool).

2. Input the hash into the vBase Dune dashboard.

3. Confirm that the returned record matches your certificate details (timestamp, submitter address).

Method 4: Blockchain Explorer

1. Use the Transaction ID from your stamping transaction.

2. Open PolygonScan and input this transaction id.

3. Locate the data hash embedded in the transaction input.

4. Compare the published against the hash of your content.

Method 5: Smart Contract Validation

1. Identify the vBase smart contract on Polygon Mainnet (Chain ID: 137): 0x80D2AB15EE5b91cD7A183b8938dC277fE6191F7d

2. Call the validation function with:

   validate(cid, user_address, timestamp)

   • cid: your file’s ContentID (hash)

   • user_address: the stamper's blockchain address

   • timestamp: the timestamp (in blocks) for the stamp (note, timestamp can be approximate and you can iterate over many timestamps)

3. Verify that the function returns true.

API Methods

Method 6: vBase REST API

• Use the vBase REST API to query a stamp by its ContentID.

• See the REST API documentation for endpoint details, authentication, and response formats.

Method 7: vBase Python SDK

• Install the vBase Python SDK and call the built-in verification function with a ContentID.

• See the Python SDK documentation for usage examples.

Notes on Validation

• If a stamp is found: Your file existed on or before the recorded timestamp.

• If no stamp is found: No blockchain record exists for that file.

• Privacy: Only the cryptographic fingerprint (hash) is stored on-chain. File contents are never exposed.