Gift cards

A gift card is prepaid USDC in a URL. You lock funds into a shared vault behind a Poseidon commitment, share /g/<id>?s=…&v=…&r=…, and the recipient claims once with an unwrap proof.

The amount stays hidden on-chain until claim. Sender and claimer remain public; the note is plaintext in v1. Treat the link like cash — it carries the opening (v amount + r blinding).

This is the push sibling of request links (pull invoices that fund a stream).

Flow

1. Create — User app → Transfer → Gift card → amount → Lock & get link (proves wrap, QR + copy)
2. Share — Anyone with the URL can open the claim page
3. Claim — Connect wallet → prove unwrap → Claim to wallet (gasless when sponsored)

On-chain: streamline::giftcard stores blake2b256(secret) and Poseidon(amount, blinding). Funds sit in GiftCardVault; individual cards have no balance field (so amount cannot leak via object fields).

Status

Module and app UI ship in-repo. Publish/upgrade the Move package, then call giftcard::create_vault once and set NEXT_PUBLIC_GIFT_CARD_VAULT_TESTNET (see .env.example) before create/claim succeed against live RPC.