Securely store your notes on the blockchain with NoteChain. End-to-end encrypted, decentralized, and censorship-resistant note-taking app.

👋 Hi Product Hunt! I’m the creator of NoteChain. I built this because I got tired of trusting Big Tech with my most private thoughts — trading strategies, wallet recovery hints, half-baked ideas, even personal journal entries. Every time I opened Google Keep or Evernote, I wondered: “Who else can see this? What if they get hacked? What if they sell my data?” So I asked: What if your notes lived on the blockchain — encrypted, owned by you, and unstoppable? That’s NoteChain: ✍️ Write notes directly on L2 chains (Base, Arbitrum, Polygon & 9 more) 🔐 Encrypted on your device — only your private key can unlock them 💸 Tiny fee (0.00001 ETH or about $0.05 for today) keeps it sustainable — no ads, no tracking 🎫 NFT gating coming soon (unlock longer notes with your NFTs) This isn’t just another dApp. It’s a statement: Your data should belong to YOU. Try it in 60 seconds → https://www.notechain.io I’d love your feedback — what note would you store first? What feature should we build next? Let’s make privacy simple, together.

Easy to use, very convenient

Looks good. But what happens to the encoded notes if the site goes down?

@alsancakcolab
In fact there are no reasons to worry, because Notechain implements clientside cryptography for note encryption.
We using the following technologies:
- AES-256-GCM for encrypt notes

- ECIES, for encrypting AES kes with Etherium public key.

Easy to use, very convenient

Looks good. But what happens to the encoded notes if the site goes down?

@alsancakcolab
In fact there are no reasons to worry, because Notechain implements clientside cryptography for note encryption.
We using the following technologies:
- AES-256-GCM for encrypt notes

- ECIES, for encrypting AES kes with Etherium public key.

NoteChain

Decentralized encrypted notes

Decentralized encrypted notes