Creative Blockchain
🎨 Visual Art · digital signature minting

AuthSign · Metered

An invisible cryptographic handshake. Use QUIP to programmatically seal digital assets with a verifiable biometric or stylus-based signature. Collectors pay a micropayment to verify the provenance on-chain, turning every view into a micro-revenue event for the artist. Every unlock is a single 0.01 USDC payment behind an HTTP 402 gate — you pay for what you actually use.

x402 track · paid unlockMetered 402 gate· pay-per-unlock
Section · Onchain

The primitive.

full primer →

The valuable digital signature minting operation sits behind an HTTP 402 that states its price before anyone signs, so painters pay per unlock instead of per month.

Why this primitiveLoading details…

Kernel
an HTTP 402 challenge in front of exactly one valuable operation — an export, a render, a full-resolution download — where each unlock is a single USDC payment bound to its settlement tx
Drives the UI as
a locked panel that states its price before you sign, plus an 'unlocks bought / used' counter beside the released payload
Appendix · Secrets

Required keys.

METAMASK_PRIVATE_KEY
Deploys the QUIP verifier to your host chain. Fund on Sepolia via the Google Cloud faucet.
open ↗
SEPOLIA_RPC_URL
Host-chain HTTPS RPC endpoint. Any Sepolia provider works.
open ↗
ETHERSCAN_API_KEY
Required for npx hardhat verify after deploy.
open ↗

Add these in your Lovable project under Settings → Secrets before pasting the prompt below.

Appendix · Mega-prompt

The build prompt.

Paste into a fresh Lovable project. Make sure all five secrets above are set first. read the build strategy →

Loading the build prompt…
Open in Lovable ↗Sepolia Etherscan ↗
Appendix · Market

Market sizing.

TAM
…
SAM
…
SOM
…

Indicative figures for hackathon pitches — refine with your own research before raising.

See also

Adjacent entries.

digital signature minting
Signature Seal
Allow artists to mint unique digital signatures as NFT proof of authorship and authenticity. The creator's existing wallet is wrapped with a post-quantum commitment.
gallery exhibition tracking
Exhibit · Metered
Provenance is a living ledger, not a static database. Turn the 'paper trail' into a real-time revenue stream for estates and digital creators. Every unlock is a single 0.01 USDC payment behind an HTTP 402 gate — you pay for what you actually use.
collaborative art governance
Vandal · Metered
A hyper-granular collaborative mural where every stroke, color change, or vote to 'lock' a section requires a signature-authorized micropayment. Settlement happens instantly per interaction, turning the canvas into a real-time sovereign economic battlefield. Every unlock is a single 0.01 USDC payment behind an HTTP 402 gate — you pay for what you actually use.
event admission tokens
Vernissage · Metered
A friction-less digital turnstile for fine art. The payment is the credential, eliminating bulky ticketing apps for instant, micro-transactional entry. Every unlock is a single 0.01 USDC payment behind an HTTP 402 gate — you pay for what you actually use.