Bitcoin testnet4 · Spark REGTEST · no mainnet paths
Creative Bitcoin
🎵 Music & Sound Design · loop sharing

Collaborative Loop Vault II

Securely share and build loop collections with zero gas cost and social wallet access.

Spark sats paywall· instant sats payments
Section · Onchain

The primitive.

full primer →

Musicians pay a few sats over Spark (Bitcoin L2) via a single Privy-signed transfer to unlock the loop sharing; 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
$600M
loop marketplaces
SAM
$150M
collaborative loop tools
SOM
$11M
gasless loop sharing

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

See also

Adjacent entries.

loop sharing
Collaborative Loop Vault
Securely share and build loop collections with zero gas cost and social wallet access.
beat selling
NFT Beat Marketplace II
Buy and sell beats with onchain provenance and zero gas fee transactions.
music rights management
Instant Royalty Splits II
Automatically split royalties among collaborators with transparent, gasless onchain transactions.
live-set sampling
Gas-Free Live Sampling II
Capture and share live samples onchain instantly without blockchain transaction fees.