Bitcoin testnet4 · Spark REGTEST · no mainnet paths
Creative Bitcoin
🎨 Visual Art · brush technique archives

Brushstroke Chain II

Record and mint signature brushstroke styles as NFTs for artist branding and licensing.

Spark sats paywall· instant sats payments
Section · Onchain

The primitive.

full primer →

Painters pay a few sats over Spark (Bitcoin L2) via a single Privy-signed transfer to unlock the brush technique archives; settlement is instant and the merchant confirms via getBalance.

Why this primitiveA Spark sats transfer settles in under a second and is Bitcoin-native — perfect for gating this content behind a one-click, low-friction micropayment.

Kernel
a 'pay N sats on Spark to unlock' gate — the user signs a Spark transfer via Privy, the merchant's wallet observes the transfer via Spark's getBalance/getTransfers, and the endpoint releases the payload
Drives the UI as
a 'pay 100 sats to unlock' button that returns the Spark tx id, the merchant confirmation, and settles instantly
Appendix · Secrets

Required keys.

PRIVY_APP_ID
Privy dashboard → your app. Configure with chainType 'spark' to mint Bitcoin L2 wallets on sign-in.
open ↗
PRIVY_APP_SECRET
Server-side. Required for the merchant Spark wallet to observe incoming sats transfers via the Privy RPC.
open ↗
PINATA_JWT
Pins images / JSON / manifests to IPFS.
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 — it carries its own feature spec, code, setup and checklist. read the build strategy →

loading the build spec…
Open in Lovable ↗mempool.space testnet4 ↗
Appendix · Market

Market sizing.

TAM
$65B
global visual art market
SAM
$150M
visual art teaching content
SOM
$3M
brushstroke NFT sales

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

See also

Adjacent entries.

brush technique archives
Brushstroke Chain
Record and mint signature brushstroke styles as NFTs for artist branding and licensing.
illustrator community
Illustrator Guild II
Create a hosted network for illustrators to share, sell, and verify work with easy login and zero gas fees.
generative art
Generative Canvas II
Let generative artists deploy and monetize code-driven art with instant gasless onboarding and transactions.
art provenance tracking
Gallery Ledger II
Provide gallerists with gasless, onchain tools to prove artwork provenance and authenticity effortlessly.