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Oxford University Museum of Natural History

piyo@newsletter.paragraph.com (piyo.eth) — Fri, 08 Jul 2022 21:42:39 GMT

#travel

How to watch Ether balance changes - Hideyoshi Moriya - Medium

piyo@newsletter.paragraph.com (piyo.eth) — Thu, 12 May 2022 12:46:24 GMT

Testing import from medium

The example code below listens to Ether balance changes.
It gets Ether balance when a new block mined.
Strictly speaking, a fork can be happened. So you will need to count confirmation numbers depending on your application.

const ethers = require('ethers')
const network = 'rinkeby'
const provider = ethers.getDefaultProvider(network)
const address = '0xF02c1c8e6114b1Dbe8937a39260b5b0a374432bB'

// Listen Ether balance changes
let lastBalance = ethers.constants.Zero
provider.on('block', () => {
    provider.getBalance(address).then((balance) => {
        if (!balance.eq(lastBalance)) {
         lastBalance = balance
   // convert a currency unit from wei to ether
   const balanceInEth = ethers.utils.formatEther(balance)
   console.log(`balance: ${balanceInEth} ETH`)
        }
    })
})

Support

If you find this article is helpful, it would be greatly appreciated if you could tip Ether to the address below. Thank you!

Count.sol

piyo@newsletter.paragraph.com (piyo.eth) — Tue, 10 May 2022 16:30:11 GMT

pragma solidity ^0.5.1;

contract Count {
    address payable owner;
    uint public count;
    event DidCountUp(uint currentCount, address sender);
    event DidCountDown(uint currentCount, address sender);
    event DidAddValue(uint currentCount, uint value, address sender);
    event DidSubValue(uint currentCount, uint value, address sender);
    
    constructor ()
        public
    {
        owner = msg.sender;
    }
    
    function getCount()
        public
        view
        returns(uint)
    {
        return count;
    }
    
    function countUp()
        public
    {
        count += 1;
        emit DidCountUp(count, msg.sender);
    }
    
    function countDown()
        public
    {
        count -= 1;
        emit DidCountDown(count, msg.sender);
    }
    
    function addCount(uint val) 
        public
    {
        count += val;
        emit DidAddValue(count, val, msg.sender);
    }
    
    function subCount(uint val)
        public
    {
        count -= val;
        emit DidSubValue(count, val, msg.sender);
    }
    
    function destroy() 
        public
    {
        require(msg.sender == owner);
        selfdestruct(owner);
    }

}

作業 BGM

piyo@newsletter.paragraph.com (piyo.eth) — Tue, 10 May 2022 16:24:15 GMT

作業 BGM リストだよ！

Web3 smart-lock

piyo@newsletter.paragraph.com (piyo.eth) — Tue, 10 May 2022 16:08:15 GMT

wΞlock is a Web3 smart lock system that enables authentication by smart contracts. For example, you can easily create a physical space that only those with a particular NFT or ENS can enter.

Web: https://w3lock.io

Twitter: https://twitter.com/w3lock

chibi

piyo@newsletter.paragraph.com (piyo.eth) — Tue, 10 May 2022 16:04:31 GMT

chibi is my lovely dog.

Pixereum

piyo@newsletter.paragraph.com (piyo.eth) — Tue, 10 May 2022 15:53:57 GMT

Pixereum is a collaborative NFT Art Project since 2017.

In 2017, Hideyoshi Moriya began an experimental crypto art project. Each pixel was available in exchange for ETH on his website https://pixereum.io at launch. Every pixel stores color and message on the Ethereum blockchain.

New UI for ERC-721 Wrapped Pixereum: https://v2.pixereum.io

OpenSea: https://opensea.io/collection/wrapped-pixereum

Web3 services

piyo@newsletter.paragraph.com (piyo.eth) — Tue, 10 May 2022 15:49:56 GMT

piyo!

piyo@newsletter.paragraph.com (piyo.eth) — Sat, 11 Dec 2021 14:48:43 GMT

piyopiyo!