OnlyDanks

Private end-to-end encrypted messenger built on blobs, fully anonymous and censorship-resistant.

Description

What Is It?

OnlyDanks is a messaging system that lives entirely on the Ethereum blockchain. There are no apps, no servers, and no middlemen. Messages are written directly to Ethereum’s new blob storage, making them:

• Invisible to third parties (no one can read them),
• Unlinkable (no one can tell who’s talking to whom),
• Censorship-resistant (no one can delete or block them).

It works like a fully private postbox, where only the intended recipient has the key—and no one even knows the box exists.

How It Works (Conceptually)

• You create a public identity using an Ethereum Name like yourname.onlydanks.eth.
• This name links to a public key, like sharing your digital mailbox.
• When someone wants to message you:
  • They use your public key to encrypt a message.
  • They publish it into Ethereum’s blob space.
• You periodically check for new messages by scanning the blockchain.
• If a message is meant for you, you can decrypt and read it.

Why It's Special

• Privacy by design: No servers or apps know who you are.
• Stealthy delivery: Only you can find and read your messages.
• Globally accessible: Anyone with an Ethereum wallet can use it.
• No central control: Can't be taken down, blocked, or censored.
• No history or tracking: All data is ephemeral and unlinkable.

Technical

Identity & Registration

sequenceDiagram
    participant User
    participant ENS
    participant L2Registrar
    participant L2Registry

    User->>L2Registrar: Register subname (e.g. user.onlydanks.eth)
    L2Registrar->>ENS: Link subname to L2 registry
    L2Registrar->>L2Registry: Store secp256k1 public key (text record)
    ENS-->>User: ENS now resolves to public key

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• Users register ENS subnames (e.g., user.onlydanks.eth) through an L2 registrar on World-Seoplia.
• Each subname links to a secp256k1 public key via ENS text record.
• ENS’s L1 resolver points to our L2 registry.

Message Sending Flow

sequenceDiagram
    participant Sender
    participant ENS
    participant Backend
    participant Ethereum

    Sender->>ENS: Lookup recipient ENS (e.g. alice.onlydanks.eth)
    ENS-->>Sender: Return recipient's public key

    Sender->>Sender: Generate ephemeral key pair
    Sender->>Sender: Compute shared secret (ECDH)
    Sender->>Sender: Sign and encrypt message

    Sender->>Ethereum: Submit blob data:

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1. Look up ENS subname → get public key.
2. Generate ephemeral private key.
3. Use ECDH (Diffie-Hellman) to create shared secret.
4. Sign the message with sender's private key.
5. Encrypt the signed message with the shared secret.
6. Publish to blob:
   • Ephemeral public key
   • Initialization vector (IV)
   • hash(shared_secret) (used for message lookup)
   • Encrypted message

Backend Service

• Stateless, self-hostable.
• Indexes blobs and provides:
  • List of ephemeral public keys + IV
  • Messages by hash(shared_secret)
• Does not store any private info or user data.

Message Receiving Flow

sequenceDiagram
    participant Recipient
    participant Backend

    Recipient->>Backend: Fetch ephemeral pubkeys + IVs
    loop For each ephemeral pubkey
        Recipient->>Recipient: Compute shared secret (ECDH)
        Recipient->>Backend: Search messages by hash(shared secret)
        Backend-->>Recipient: Return matching blobs
        Recipient->>Recipient: Try decrypting
        alt If decryption works
            Recipient->>Recipient: Verify signature, read message
        end
    end

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• The recipient downloads ephemeral public keys + IVs from the backend.
• Tries to compute shared secrets from each.
• For each derived hash(shared_secret), queries backend for matching blobs.
• If found, decrypts the message and verifies the sender via signature.

Deployed Contracts

WorldChain

ENS Registry:	0xc3a4eb979e9035486b54fe8b57d36aef9519eac6
ENS Registrar:	0x491c7b1319A0c683027ae2A2A7b7c34913A6178e

WorldChain Sepolia

ENS Registry:	0x41Fb196Ae7D65E06880A240c8d1B91245Fb84807
ENS Registrar:	0x1468386e6ABb1874c0d9fD43899EbD21A12470A6