HongBao
Physical cards that hand out crypto rewards at real events
Start new thread

HongBao - Physical cards that hand out crypto rewards at real events

by•
Sending crypto to real people is harder than it should be. Run an airdrop and bots farm everything — most rewards end up in scripted wallets. Hongbao is a physical card that holds an on-chain reward. Hand it out at an event, the holder scans it, taps the button, and the reward lands in their wallet from a smart contract. No app signup, gas covered. Non-custodial, no admin keys, open contract. More use cases:

Add a comment

Replies

Best
Maker
📌
Maker here 👋 Quick context on why we made this. I spent years in security and cryptography before this, and the thing that always bugged me about crypto distribution is that it's all digital — which means it's all gameable. Every clever sybil-detection scheme gets beaten eventually. So instead of trying to out-detect bots, we moved the reward into something they can't fake: a physical object you have to physically pick up. The card is a one-time hardware signer. Key's generated on the chip at the factory, never comes out. It signs once to release funds, then it's spent. The contract verifies the signature and sends the reward to the address the holder gives it. Two honest caveats: - We're EVM-first right now. The protocol works for any secp256k1 chain but we've only shipped the EVM contracts so far. - No third-party audit yet — we're bootstrapping. Contracts are going open-source and I'd genuinely welcome people poking at the security model. If you run distribution and this is useful, or if you just want to tell me where the design is weak, I'm around all day. Fire away.