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0.2.2 • Public • Published

Use the ODD SDK with a blockchain wallet. Access your personal encrypted file system with your wallet keys.


Uses Ethereum by default with window.ethereum as the provider. Currently only works with MetaMask because it's the only wallet with encryption and decryption.

import * as walletauth from "odd-walletauth";
import { AppScenario } from "odd";

// Initialise

const program = await walletauth.program({
  // optional event handlers
  onAccountChange: (newProgram) => handleProgram(newProgram),
  onDisconnect: () => {
    /* eg. logout() */


function handleProgram(program) {
  if (program.session) {
    // ✅ Authenticated
  } else {
    // Failed to authenticate with wallet

Use a custom Ethereum provider:

import * as ethereum from "odd-walletauth/wallet/ethereum";


You can also write an implementation for other wallets. Note that the DID method has to be supported by the Fission server, unless you're using other services with the ODD SDK. At the moment of writing, you can only use the key method for DIDs with the Fission servers. It supports ED25519, RSA and SECP256K1 keys, same for the UCAN algorithms.

import { Implementation } from "odd-walletauth/wallet/implementation"

const impl: Implementation = {
  decrypt: (encryptedMessage: Uint8Array) => Promise<Uint8Array>,
  encrypt: (storage: Storage.Implementation, data: Uint8Array) => Promise<Uint8Array>,
  init: (storage: Storage.Implementation, args: InitArgs) => Promise<void>,
  publicSignature: {
    type: string
    magicBytes: Uint8Array
    key: (storage: Storage.Implementation) => Promise<Uint8Array>
  sign: (data: Uint8Array) => Promise<Uint8Array>,
  ucanAlgorithm: string,
  username: () => Promise<string>,
  verifySignedMessage: (storage: Storage.Implementation, args: VerifyArgs) => Promise<boolean>,

// When creating a Program indicate that you want to use your custom wallet implementation.
  wallet: impl

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npm i @oddjs/odd-walletauth

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