Bitcoin testnet4 · Spark REGTEST · no mainnet paths
Creative Bitcoin
🎮 Game Design & Interactive Media · character customization data

Avatar Trait Forge II

Save and share unique character traits and skins securely and permanently on IPFS.

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
$3B
avatar customization market in gaming
SAM
$400M
indie avatar tool users
SOM
$25M
avatar trait NFT collectors

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

See also

Adjacent entries.

character customization data
Avatar Trait Forge
Save and share unique character traits and skins securely and permanently on IPFS.
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.