Bitcoin testnet4 · Spark REGTEST · no mainnet paths
Creative Bitcoin
🎨 Visual Art · digital sketch archiving

Sketch Snapshot Chain

Instantly archive and timestamp digital sketches onchain for secure creative journaling.

OP_RETURN provenance on testnet4· onchain timestamp
Section · Onchain

The primitive.

full primer →

Digital sketch archiving gets a SHA-256 anchored into a Bitcoin testnet4 OP_RETURN — painters see a 'timestamped on Bitcoin' chip and a permanent mempool.space link.

Why this primitiveAnchoring a SHA-256 fingerprint of this artefact in a Bitcoin testnet4 OP_RETURN gives it a wallet-independent, permanent, one-line proof-of-existence.

Kernel
a SHA-256 of any artifact anchored into a Bitcoin testnet4 OP_RETURN output — a one-line, immutable, wallet-independent proof-of-existence
Drives the UI as
a 'timestamped on Bitcoin' chip with block height + a mempool.space testnet4 tx link
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
$1B
digital art tools market
SAM
$200M
digital sketch app users
SOM
$15M
early blockchain integration adopters

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

See also

Adjacent entries.

art ownership tracking
Provenance Palette
Securely track and prove the ownership lineage of paintings with tamper-proof blockchain records.
generative art minting
Generative Mint Studio
Artists can mint unique generative art pieces directly onto Rootstock testnet with automated smart contracts.
gallery exhibition tracking
Exhibit Chain Ledger
Record every artwork's exhibition history securely and transparently onchain for galleries and collectors.
color authenticity validation
ColorCode Certifier
Certify and verify exact color compositions of artworks using blockchain color code hashes.