Use this command, just change the key at the end if you want to see if some RPC is working curl -X POST --data '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":83}' https://rinkeby.infura.io/v3/617c83dcc8a3haa1ae9e1d03ea91adc8

Use this command, just change the key at the end if you want to see if some RPC is working curl -X POST --data '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":83}' https://rinkeby.infura.io/v3/617c83dcc8a3haa1ae9e1d03ea91adc8

This has been something I wished to solve for some time and finally I have a simple solution for it. You have to have infura and etherscan key for this ready, with that you need to install 2 node libraries that are in the code and you can then search for specfic contract and its events with following code.const Web3 = require('web3'); const client = require('node-rest-client-promise').Client(); const INFURA_KEY = "5ce0898319eb4f5c9d4c982c8f783927"; // Insert your own key here :) const ETHERSC...

This has been something I wished to solve for some time and finally I have a simple solution for it. You have to have infura and etherscan key for this ready, with that you need to install 2 node libraries that are in the code and you can then search for specfic contract and its events with following code.const Web3 = require('web3'); const client = require('node-rest-client-promise').Client(); const INFURA_KEY = "5ce0898319eb4f5c9d4c982c8f783927"; // Insert your own key here :) const ETHERSC...

If you are getting this kind of error on Rinkeby "If you have a slow internet connection, try configuring a longer timeout in your Truffle config. Use the networks[networkName].networkCheckTimeout property to do this" All you need to do is change this parameter to higher number networkCheckTimeout: 10000, which will look like this in the end,module.exports = { networks: { development: { host: "localhost", port: 7545, gas: 5000000, network_id: "*", // Match any network id }, rinkeby: { provide...

If you are getting this kind of error on Rinkeby "If you have a slow internet connection, try configuring a longer timeout in your Truffle config. Use the networks[networkName].networkCheckTimeout property to do this" All you need to do is change this parameter to higher number networkCheckTimeout: 10000, which will look like this in the end,module.exports = { networks: { development: { host: "localhost", port: 7545, gas: 5000000, network_id: "*", // Match any network id }, rinkeby: { provide...

If you have a pair on uniswap and it is not in default whitelist array https://github.com/Uniswap/uniswap-v2-subgraph/blob/9692685423f9a16fa30a2cf08ceeff69fcdd8367/src/mappings/pricing.ts#L42 you will need to have some other rules fullfiled, otherwise your volume will get "untracked label", so to change that you need to have minimum 5 liquidity providers and pass a minimum value threshold, code can be checked here. https://github.com/Uniswap/uniswap-v2-subgraph/blob/9692685423f9a16fa30a2cf08c...

If you have a pair on uniswap and it is not in default whitelist array https://github.com/Uniswap/uniswap-v2-subgraph/blob/9692685423f9a16fa30a2cf08ceeff69fcdd8367/src/mappings/pricing.ts#L42 you will need to have some other rules fullfiled, otherwise your volume will get "untracked label", so to change that you need to have minimum 5 liquidity providers and pass a minimum value threshold, code can be checked here. https://github.com/Uniswap/uniswap-v2-subgraph/blob/9692685423f9a16fa30a2cf08c...

Code smart contract with remix or some other tool, copy .sol to local environmentStart truffle console and local chain with "truffle develop"If you placed your contract in proper directory and made migration script, you can deploy it to local blockchain with "migrate --reset" commandCompile your smart contracts with "truffle compile"Copy smart contract ABI from compiled .json and instantiate web3 object in your web2 file (.html)Instantiate smart contract instanceCall Smart Contract function(m...

Code smart contract with remix or some other tool, copy .sol to local environmentStart truffle console and local chain with "truffle develop"If you placed your contract in proper directory and made migration script, you can deploy it to local blockchain with "migrate --reset" commandCompile your smart contracts with "truffle compile"Copy smart contract ABI from compiled .json and instantiate web3 object in your web2 file (.html)Instantiate smart contract instanceCall Smart Contract function(m...

To check if address is Externally Owned Account (EOA) or smart contract address you can use this code function isRegularAddress(address _addr) public view returns(bool) { if (_addr == address(0)) { return false; } uint size; assembly { size := extcodesize(_addr) } // solium-disable-line security/no-inline-assembly return size == 0; } probably you will use this internally and use internal instead of public, but for testing purposes you can use public to see true of false returns

To check if address is Externally Owned Account (EOA) or smart contract address you can use this code function isRegularAddress(address _addr) public view returns(bool) { if (_addr == address(0)) { return false; } uint size; assembly { size := extcodesize(_addr) } // solium-disable-line security/no-inline-assembly return size == 0; } probably you will use this internally and use internal instead of public, but for testing purposes you can use public to see true of false returns

I created and deployed Multisig SC with remix per https://solidity-by-example.org/app/multi-sig-wallet/ to Ropsten here https://ropsten.etherscan.io/address/0x3efcef19c9500eeac7f0777811fad0bc… But to get all this nice Etherscan buttons and be able to "Read Contract", "Write contract" and use all the functions SC deploys to blokchain you need to verify it first.EtherscanSo you will need to upload your SOLIDITY code and then you could be stuck with inputting constructor arguments as Etherscan w...

I created and deployed Multisig SC with remix per https://solidity-by-example.org/app/multi-sig-wallet/ to Ropsten here https://ropsten.etherscan.io/address/0x3efcef19c9500eeac7f0777811fad0bc… But to get all this nice Etherscan buttons and be able to "Read Contract", "Write contract" and use all the functions SC deploys to blokchain you need to verify it first.EtherscanSo you will need to upload your SOLIDITY code and then you could be stuck with inputting constructor arguments as Etherscan w...

Preserve base URL for use with smart contractsBy default using IPFS Desktop and uploading files will give your shareable links each time different URL, which is a problem when you want to have base URL and just change the last part of the path per token ID. So to solve that you need to use is "Wrap Filenames and Directory Info around Content" https://dweb-primer.ipfs.io/files-on-ipfs/wrap-directories-around-conte… which in CLI looks like this. $ ipfs add -w mytextfile.txt added QmZtmD2qt6fJot...

Preserve base URL for use with smart contractsBy default using IPFS Desktop and uploading files will give your shareable links each time different URL, which is a problem when you want to have base URL and just change the last part of the path per token ID. So to solve that you need to use is "Wrap Filenames and Directory Info around Content" https://dweb-primer.ipfs.io/files-on-ipfs/wrap-directories-around-conte… which in CLI looks like this. $ ipfs add -w mytextfile.txt added QmZtmD2qt6fJot...

For nextjs app to work properly when added to IPFS or Swarm you need to make full html static export, also to make it work and be compatible and run without any server you need to change some config. This is what I find is a good optionmodule.exports = { images: { unoptimized: true, }, assetPrefix: './', trailingSlash: true, env: { NEXT_PUBLIC_MINTER_ADDRESS: "0xc62eA1d5a04316374926ea75b491f4C2a45418C1", }, } assetPrefix: "./", must be used others are not mandatory. You can also use regular ....

For nextjs app to work properly when added to IPFS or Swarm you need to make full html static export, also to make it work and be compatible and run without any server you need to change some config. This is what I find is a good optionmodule.exports = { images: { unoptimized: true, }, assetPrefix: './', trailingSlash: true, env: { NEXT_PUBLIC_MINTER_ADDRESS: "0xc62eA1d5a04316374926ea75b491f4C2a45418C1", }, } assetPrefix: "./", must be used others are not mandatory. You can also use regular ....

First login to the graph site with your github account, then go to Dashboard on the link here https://thegraph.com/explorer/dashboard and there you will have big button that says Add Subraph, click on it and fill the info needed to add subgraph.After you add your boilerplate you will be provided with 3 additional step that you need to do.so first install graph-cli locally with npm install -g @graphprotocol/graph-cliNext you need to initialize your subgraph as this is probably your first time ...

First login to the graph site with your github account, then go to Dashboard on the link here https://thegraph.com/explorer/dashboard and there you will have big button that says Add Subraph, click on it and fill the info needed to add subgraph.After you add your boilerplate you will be provided with 3 additional step that you need to do.so first install graph-cli locally with npm install -g @graphprotocol/graph-cliNext you need to initialize your subgraph as this is probably your first time ...

To access manifest path file when you uploaded folder with arweave is not straightforward but can be obtained if you use URL where your files are deployed and add some paths to it. So if you got file uploaded like this. https://arweave.net/868kWwjNIa_Zt3Gbezw-XKlncgSCq8MZfIctRvW71Rg what you need to so is add /tx/ and then data.json to URI like this and you will have a URI to see your manifest file. https://arweave.net/tx/868kWwjNIa_Zt3Gbezw-XKlncgSCq8MZfIctRvW71Rg/data…

To access manifest path file when you uploaded folder with arweave is not straightforward but can be obtained if you use URL where your files are deployed and add some paths to it. So if you got file uploaded like this. https://arweave.net/868kWwjNIa_Zt3Gbezw-XKlncgSCq8MZfIctRvW71Rg what you need to so is add /tx/ and then data.json to URI like this and you will have a URI to see your manifest file. https://arweave.net/tx/868kWwjNIa_Zt3Gbezw-XKlncgSCq8MZfIctRvW71Rg/data…

Address vs address payable ? The distinction between address and address payable was introduced in Solidity version 0.5.0. The idea was to make the distinction between addresses that can receive money, and those who can’t (used for other purposes). Simply speaking, an address payable can receive Ether, while a plain address cannot. So in Solidity, from the sender perspective:You can send Ether to a variable defined as address payableYou cannot send Ether to a variable defined as addresscontra...

Address vs address payable ? The distinction between address and address payable was introduced in Solidity version 0.5.0. The idea was to make the distinction between addresses that can receive money, and those who can’t (used for other purposes). Simply speaking, an address payable can receive Ether, while a plain address cannot. So in Solidity, from the sender perspective:You can send Ether to a variable defined as address payableYou cannot send Ether to a variable defined as addresscontra...