Proof-of-Humanity-React

Proof-of-Humanity Core Component for React.

Used as a wrapper for PoH validators.

Live dApp demo

https://poh-counter.bakoush.in (source code)

Install

npm install poh-react

Usage

1. Wrap your app into the ProofOfHumanityProvider

import { ProofOfHumanityProvider } from 'poh-react';

<ProofOfHumanityProvider>
  <App />
</ProofOfHumanityProvider>;

2. Initialize at least one PoH validator plugin (e.g. poh-validator-hcaptcha)

import hCaptchaValidator from 'poh-validator-hcaptcha';

const validator = (
  <HCaptchaValidator
    sitekey="10000000-ffff-ffff-ffff-000000000001"
    url="http://localhost:3000/api/v1/proof"
  />
);

3. Initialize the getProofOfHumanity method from the PoH hook

import { useProofOfHumanity } from 'poh-react';

const { getProofOfHumanity } = useProofOfHumanity(validator);

4. Obtain the Proof-Of-Humanity prior to sending any sensitive transaction

const handleClick = () => {
  try {
      const { error, errorMessage, proof } = await getProofOfHumanity();

      if (!error) {
        const tx = await mySmartContract.someImportantMethod(proof);
      }
  } catch(error) {
    console.error(error);
  }
}

<button onClick={handleClick}>Send transaction</button>

The method in the smart contract must know how to deal with the proof. You can leverage a Solidity library just for that: poh-contracts

Using Sovereign PoH

If you want to use sovereign PoH instead of the basic one, you have to provide additional options object to useProofOfHumanity hook.

Options object has two properties:

• type – if sovereign, the PoH component should ask the user to confirm their address ownership. The default value is basic
• ethereum – specifies MetaMask API used to sign address ownership confirmation

Example:

import { useProofOfHumanity } from 'poh-react';

const { getProofOfHumanity } = useProofOfHumanity(validator, {
  type: 'sovereign',
  ethereum
});

Supported Validator Plugins

• hCaptcha validator

Validator Plugin Requirements

Validator plugin component must be a React component accepting the following props:

renderLogoOnly (boolean) – if true, the component should render its own logo instead of actual validator interface

data (string) – data (a hex string) to be included into signed proof-of-humanity. Can be a random hex challege, or a random hex challenge along with address owner signature

onVerify (function) – must be called once validation is complete with the object with following keys as the only parameter:

• error (boolean) – true in case of error; otherwise false

• errorMessage (string) – in case of error; otherwise null

• proof (string): proof-of-humanity (a hex string); null in case of error

Example plugin: hCaptcha validator

See also

• Proof-of-HUMANity on-chain: protect your smart contracts from bots
• Proof-of-Humanity hCaptcha Validator API
• Proof-of-Humanity hCaptcha Validator React
• Proof-of-Humanity Solidity Contracts
• Counter dApp Example

Author

Alex Bakoushin

License

MIT