SisterSafe

SisterSafe is a global safety network designed for women who walk alone and want trusted, real-time support. After verifying your identity, you can securely share your live location with selected “sisters” in your zone around the world. Your data stays encrypted at all times, and your exact location is revealed only if you trigger a panic alert or exit a predefined safe zone. SisterSafe empowers women to look out for each other and feel safer while navigating unfamiliar places—without compromising their privacy.

The system ensures your friends are real humans via Self Protocol (preventing fake accounts), stores your encrypted location and keys in Oasis Sapphire confidential contracts, and verifies alerts on Celo L2 to guarantee censorship-resistant safety signals. For the millions of women who say “Let me know when you arrive”, now there’s a trustless and private way to actually do it.

SisterSafe combines four core technologies to deliver private, verifiable, real-time safety. Self Protocol provides ZK-based identity verification, ensuring that contacts are real, unique humans without requiring personal documents or linking wallets. Oasis Sapphire’s confidential smart contracts store the encrypted location decryption key and manage access to it. The key is released only when a valid zero-knowledge proof confirms that a user triggered a panic alert or stepped outside her designated safe zone.

Celo L2 is used to verify these proofs on-chain, making emergency alerts censorship-resistant and guaranteeing transparent, tamper-proof logic. A custom zk-Proof-of-Location circuit validates emergency conditions without revealing raw GPS coordinates—your location is decrypted exclusively for your verified contacts when you truly need help. This combination of ZK identity, confidential compute, and verifiable alerts forms a seamless, trustless safety network for women everywhere.