Creative Blockchain
🎨 Visual Art · public mural documentation

STREET SEAL · Pay to Anchor

Users sign a permission to unlock geographic location data and professional-grade documentation of fleeting public works, ensuring the creator gets paid for the preservation of their physical labor long after the wall is buffed. One 0.01 USDC payment over x402 anchors the WOTS+ seal on-chain — no subscription, no account.

x402 track · paid unlockPay-to-anchor· paid provenance
Section · Onchain

The primitive.

full primer →

Painters pay 0.01 USDC once, in-page, and the public mural documentation seal is written on-chain for them — no funded host-chain wallet, no subscription, just a payment log that ends in a real transaction.

Why this primitiveLoading details…

Kernel
a 0.01 USDC payment over x402 on Base Sepolia that buys one on-chain anchor — the server verifies the settlement, then a relayer writes the user's WOTS+ seal into the QUIP verifier on the host chain
Drives the UI as
a numbered payment log running from 402 challenge to settled USDC to the host-chain anchor tx, every hash a clickable explorer link
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.

public mural documentation
Minted Murals
Authenticate and immortalize public murals with creator-owned NFT provenance tokens. The creator's existing wallet is wrapped with a post-quantum commitment.
art ownership tracking
HardTrace · Pay to Anchor
Trade paper trails for a micro-paid, immutable ledger of truth. One 0.01 USDC payment over x402 anchors the WOTS+ seal on-chain — no subscription, no account.
creative process timestamping
STROKE · Pay to Anchor
Provenance-as-a-Service for digital painters. Instead of bulk-uploading finished pieces, artists call the QUIP endpoint to anchor specific strokes or layers to Base in real-time. Zero-friction creative audit trails. One 0.01 USDC payment over x402 anchors the WOTS+ seal on-chain — no subscription, no account.
commission workflow management
Proof of Stroke · Pay to Anchor
Eliminate the friction of 'half upfront' deposits. Artists publish gated progressive layers (sketches, linework, flats) that patrons unlock instantly via EIP-3009. Every feedback loop or high-res export is a micro-settled transaction on Ethereum Sepolia. Payment becomes the heartbeat of the creative workflow, protecting the artist's time while giving the patron an 'undo' button at any milestone. One 0.01 USDC payment over x402 anchors the WOTS+ seal on-chain — no subscription, no account.