Bitcoin testnet4 · Spark REGTEST · no mainnet paths
Creative Bitcoin
📷 Photography · fine art prints

ProPrint Certify II

Certify fine art photo prints with tamper-proof digital provenance.

Spark sats paywall· instant sats payments
Section · Onchain

The primitive.

full primer →

Photographers pay a few sats over Spark (Bitcoin L2) via a single Privy-signed transfer to unlock the fine art prints; 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
$2.4B
photo software & art market
SAM
$400M
fine art photography prints
SOM
$40M
certified print marketplaces

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

See also

Adjacent entries.

fine art prints
ProPrint Certify
Certify fine art photo prints with tamper-proof digital provenance.
photo sharing
Gasless Gallery II
Seamlessly share photos onchain with no gas fees for your audience and collaborators.
photojournalism
NFT Photo Stories II
Create and share onchain photo stories with built-in provenance and no wallet setup hassle.
color grading
ChainColor Study II
Save and share color grading presets onchain without spending gas or complex wallet setup.