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VIDEO.md

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Demo video (~2:02)

Two renders exist:

  • docs/demo-narrated.mp4 — the demo with an ElevenLabs voiceover (voice Roger) and captions transcribed from that voice (whisper, then spelling-fixed), all synced and composed in Remotion (see ../video/).
  • docs/demo.mp4 — the same, silent (captions only).

How it's built (all in ../video/):

  1. frontend/record-clean.mjs records a clean screencast (no overlays) with the app actions timed to the voiceover beats.
  2. scripts/wsl-transcribe.sh transcribes narration.mp3 with whisper.cpp → video/src/captionData.ts (text + ms timestamps; terms spelling-corrected).
  3. Remotion (video/src/Composition.tsx) overlays the synced captions + an end card and renders against the voiceover.

So the captions match the spoken words exactly, and each on-screen action lines up with what's being narrated. Everything shown is real — the proof is generated in the browser and verified live against the deployed Soroban contract.

The transcript is in ../video/src/captionData.ts. The table below is the original shot list (kept for reference).

# Time On screen Narration
0 0:00–0:05 Title card: Agent Passport "Agent Passport — a zero-knowledge credential that lets AI agents pay on Stellar, without trusting them."
1 0:05–0:18 Hero "AI agents are starting to pay autonomously. Today that means handing them your keys, or KYC-ing into a honeypot — both leak money or identity. Agent Passport fixes that with one ZK proof."
2 0:18–0:38 Step 1 — set cap, Generate proof, proof appears "The owner picks a spend cap and generates a Groth16 proof entirely in the browser. It proves the agent is backed by a registered human, is Sybil-resistant, and is solvent — balance ≥ cap. The private key and balance never leave the page."
3 0:38–0:58 Step 2 — Verify on Stellar, card seals "The proof is verified on-chain: Soroban runs the BN254 pairing check and mints a zk-passport attestation. This is live on testnet — no wallet needed, it's a read-only simulation."
4 0:58–1:18 Step 3 — Pay within / over cap "Now the x402 gate. A payment within the proven cap is authorized — over it, denied. The balance itself is never revealed; only the proof that it covered the amount."
5 1:18–1:33 Step 4 — Replay a spent passport → NullifierUsed "Each passport burns a one-time nullifier. Replaying a spent proof is rejected on-chain — anti-replay and anti-Sybil, enforced by the contract."
6 1:33–1:55 Scroll to Under the hood "Under the hood: a ~9.6k-constraint Circom circuit, and two contracts deployed on Stellar testnet — the BN254 verifier and the stateful validator that stores nullifiers and writes attestations."
7 1:55–2:10 End card: repo URL "It reuses Nethermind's verifier and targets ERC-8004 for agent identity. Open source — github.com/leocagli/open-stellar-passport. Thanks for watching."

Tips

  • Keep it under 3 minutes (DoraHacks requirement).
  • If recording your own screen instead of the auto-screencast: open npm run dev, walk steps 1→4 in order, then scroll to "Under the hood".
  • Convert webm→mp4 if your host needs it: ffmpeg -i demo.webm -c:v libx264 -pix_fmt yuv420p demo.mp4.