Bitcoin testnet4 · Spark REGTEST · no mainnet paths
Creative Bitcoin
🎮 Game Design & Interactive Media · interactive puzzles

Onchain Puzzle Locks II

Design puzzles whose solutions must be proven onchain via Rootstock testnet smart contracts to unlock game content.

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

The primitive.

full primer →

Game designers 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
$700M
global puzzle game revenue including ARGs
SAM
$180M
blockchain-integrated puzzle experiences
SOM
$12M
indie puzzle creators exploring cryptographic challenges

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

See also

Adjacent entries.

interactive puzzles
Onchain Puzzle Locks
Design puzzles whose solutions must be proven onchain via Rootstock testnet smart contracts to unlock game content.
quest tracking
Onchain Quest Ledger II
Securely log player quest progress and achievements on Rootstock testnet to prove in-game milestones.
item distribution
Tokenized Loot Drops II
Distribute rare, verifiable loot as tokens directly through Rootstock testnet smart contracts to guarantee authenticity.
community trust
Player Reputation Ledger II
Create immutable player reputation scores recorded on Rootstock testnet to foster fair matchmaking and collaboration.