Bitcoin testnet4 · Spark REGTEST · no mainnet paths
Creative Bitcoin
🎨 Visual Art · auction facilitation

ArtChain Auctions II

Create gasless onchain auctions for visual artists with fast wallet onboarding and sponsored bids.

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 auction facilitation; 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
$12B
global art auctions
SAM
$3.5B
digital art auction platforms
SOM
$180M
gasless auction users

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

See also

Adjacent entries.

auction facilitation
ArtChain Auctions
Create gasless onchain auctions for visual artists with fast wallet onboarding and sponsored bids.
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.