AuthSign · x402
An invisible cryptographic handshake. Use x402 to programmatically seal digital assets with a verifiable biometric or stylus-based signature. Instead of heavy minting fees, creators pay 0.01 USDC per 'Seal' to generate a tamper-proof, time-stamped HTS transfer attestation. Collectors pay a micropayment to verify the provenance on-chain, turning every view into a micro-revenue event for the artist.
The primitive.
Access to the digital signature minting engine is metered with x402: 0.01 HBAR or 0.01 HTS USDC per call, paid from the embedded wallet, so painters — or the agents working for them — pay per query and get a HashScan receipt every time.
Why this primitiveBy commoditizing the 'signature' as a 1-cent utility rather than a high-cost NFT event, we shift from 'selling art' to 'metered authenticity' where every verification call generates revenue.
Required keys.
Add these in your Lovable project under Settings → Secrets before pasting the prompt below.
The build prompt.
Paste into a fresh Lovable project. Make sure all five secrets above are set first. read the build strategy →
Loading the mega-prompt…
Market sizing.
Indicative figures for hackathon pitches — refine with your own research before raising.