Cristobal Valencia
@DevCristobalvc
Cristobal Valencia
@DevCristobalvc
Hacker Latam | Builder web3 | ETH CALI | AI Engineer | ZK | NodoZK
Hacker Latam | Builder web3 | ETH CALI | AI Engineer | ZK | NodoZK
Solidity
PostgreSQL
Blockchain Development
NestJS
Next.js
Cali, Colombia
Cristóbal Valencia Cerón
Web3 developer and full-stack engineer from Cali, Colombia. Core member of Ethereum Cali and Ethereum Colombia, contributing to the Ethereum ecosystem through code, community and education since 2023.
What I build
- Passport Agent Protocol (PAP): human-in-the-loop authorization for AI agents. Agents get an ERC-8004 passport; their owner stamps scoped, expiring visas from the phone with Face ID, and HashKey Chain enforces them. Payments, sealed API keys, an x402-style gate, an MCP server and a Claude Code plugin. Live at pap.devcristobalvc.com.
- Web3 and DeFi infrastructure: DEX and arbitrage tooling, perpetual dark pools.
- Blockchain-as-a-Service for document traceability and consent.
- Public-good systems: certification tools and off-grid deployments.
- Onboarding programs for developers in Latin America.
Stack
Solidity, Foundry, Hardhat · Next.js, React, TypeScript, Tailwind · NestJS, PostgreSQL, Redis · IPFS / Filecoin · ZK (Semaphore, Groth16) · AI agents and MCP.