Bitcoin testnet4 · Spark REGTEST · no mainnet paths
Creative Bitcoin
🎨 Visual Art · peer review logging

Art Critique Chain II

Record artist peer critiques and feedback permanently and transparently onchain.

Privy Spark sign-in· bitcoin wallet UX
Section · Onchain

The primitive.

full primer →

Painters sign in with Google through Privy — no seed phrase, no wallet extension — and Privy mints them a Spark (Bitcoin L2) wallet plus a Bitcoin testnet deposit address in one flow.

Why this primitiveA Privy Spark embedded wallet lets creators sign in with Google and receive a Bitcoin L2 address in one click — no seed phrase, no browser extension.

Kernel
Privy embedded wallet with chainType 'spark' — Google / email sign-in mints a Bitcoin testnet address plus a Spark (Bitcoin L2) address in one flow, no seed phrase, no extension
Drives the UI as
a one-click 'Sign in with Google' that drops the user into the app with a copy-able Spark address and a testnet BTC deposit address
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
$500M
peer review platforms globally
SAM
$120M
digital visual art communities
SOM
$10M
blockchain critique tool users

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

See also

Adjacent entries.

peer review logging
Art Critique Chain
Record artist peer critiques and feedback permanently and transparently onchain.
generative art minting
Generative Mint Studio II
Artists can mint unique generative art pieces directly onto Rootstock testnet with automated smart contracts.
gallery exhibition tracking
Exhibit Chain Ledger II
Record every artwork's exhibition history securely and transparently onchain for galleries and collectors.
color authenticity validation
ColorCode Certifier II
Certify and verify exact color compositions of artworks using blockchain color code hashes.