# Build Your First zkPDF Proof I Vikas Rushi

- Channel: [ETHGlobal](https://streameth.org/ethglobal)
- Date: 2025-11-09
- Duration: 18:19
- Topics: zkPDF, zero-knowledge proofs, SP1 prover, Groth16, PlonK, document verification, PDF signature, public key hash, DigiLocker, DocuSign, Indian government, Web2 to Web3 bridge, EVM verification, commitments, hash digest, Rust circuits, zkSNARK, zero-knowledge identity, KYC, age verification, proof generation, onchain verification, privacy-preserving credentials, data integrity, verifiable documents, ProNet API, zkProof benchmarks, cryptographic proofs
- Watch: https://streameth.org/watch/yt-9TBTcIA7BaI
- YouTube: https://www.youtube.com/watch?v=9TBTcIA7BaI

## Description

Vikas Rushi presents the concept of zkPDF, a framework for generating zero-knowledge proofs from digitally signed PDFs. The system enables users to prove statements derived from trusted documents—like age verification, ownership of degrees, or bank transactions—without revealing the full file. By extracting signatures and document data, zkPDF bridges Web2-signed documents (e.g., DigiLocker, DocuSign) into Web3 verifiable proofs. These proofs use the SP1 prover network to create Groth16 or PlonK proofs, which can be verified on EVM-compatible blockchains such as Ethereum and Arbitrum. Rushi explains that zkPDF leverages the public keys of government or institutional authorities to validate authenticity and allows users to make verifiable claims (e.g., “over 18”) using minimal disclosure.

He then walks through the technical workflow, from uploading a PDF and extracting its signature to generating and verifying proofs onchain. The demo shows how users can verify whether a PDF is compatible with the zkPDF stack and produce proofs using two core methods: extract + verify and substring with offset. Vikas highlights current limitations—proof generation happens server-side due to computational constraints—and previews plans to make zkPDF client-side. The talk covers integration steps with SP1 circuits, sample Rust libraries, and pre-built smart contracts for verifying proofs. He concludes by showing how commitments prevent replay attacks, benchmarks proof sizes and times (31–52 seconds), and encourages developers to experiment with API endpoints, templates, and zkPDF’s GitHub repository for building verifiable Web3 document systems.

00:00 – Introduction: why zkPDF matters
00:34 – Web2 signed data and government PDFs
01:05 – Use cases: KYC, finance, and age proofs
01:29 – Proving statements from trusted documents
01:50 – Importance of document signers and authorities
02:16 – Indian government PDF signature example
02:41 – How the zkPDF stack works (SP1 prover, verifier contract)
03:37 – Proof generation on server-side
03:59 – Computational limits and client-side roadmap
04:19 – Compatibility check: verifying signatures in PDFs
05:19 – Demonstration: extract and verify method
06:00 – Substring with offset verification
06:30 – Repo structure and setup overview
06:55 – Environment variables and SP1 access
07:16 – Inputs, outputs, and commitments
08:03 – Proof generation options (local vs. ProNet API)
08:25 – Live demo: proof request and generation
09:22 – Proof verification onchain/offchain
10:14 – API reference: verify and extract methods
11:07 – Extracting text and committing proofs onchain
11:37 – Smart contract verification flow
11:58 – Document commitments and replay protection
13:17 – Signature algorithms and support (RSA-SHA)
14:25 – PDF compatibility and limitations
14:44 – Client-side feasibility
15:22 – Integration guide for zkPDF APIs
15:48 – Accessing SP1 ProNet and dashboards
17:45 – Benchmarks: proof time and gas cost
18:10 – Closing remarks and resources

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🇮🇳 *ETHGlobal New Delhi*
This workshop is specifically for ETHGlobal New Delhi, a 3-day hackathon held September 19-21 at the India International Convention & Expo Centre, bringing together the most skilled web3 developers, designers and product builders from all around the globe for a weekend-long adventure to advance the Ethereum ecosystem! Watch the full ETHGlobal New Delhi 2025 playlist here: https://www.youtube.com/playlist?list=PLXzKMXK2aHh7zCFW3hBqatZ18rQaYeEJL
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