chainlink node operator tutorialHow to Navigate Etherscan Chainlink Engineering Tutorials

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chainlink node operator tutorial chainlink verkopen How to Navigate Etherscan Chainlink Engineering Tutorials
hi im richard one of the developer advocates at chainlink labs and in this tutorial were going to take a look at how to find a contract for an nft project and take a look at it using etherscan so if we head on over to openc we can see here one of the popular projects doodles given this project we want to find the contract that powers these nfts if we pick one of the nfts we can head down to the details section from here we should be able to find the contract address given this address when we click on it itll take us over to etherscan now etherscan is a block chain explorer and what this means is it gives us the ability to look at the transactions and contracts and basically all of the information surrounding a contract on the blockchain in this case its the ethereum blockchain if we look here we can see that contract has a green check mark next to it that means that the contract has been verified once a contract has been verified the source code is available to you using etherscan so you can actually read it in a human readable format all blockchain contracts have their source code stored but its not always in a nice human readable format like this if we scroll down we should be able to see the contracts powering this project this first one doodles.soul is going to be the contract that will power the entire project we can see a few things here first of all it imports some open zeppelin contracts thats awesome open zeppelin is an industry standard and they have battle tested contracts that have been used time and time again and are great standard when it comes to contracts for things like defining erc 721 projects thats the standard for an nft ownability and even using other things like an extension on the erc 721 contract for enumerability if we look here we can see all of the different functions and what exactly this contract is doing now fully understanding solidity the language that this contract is written in is a bit outside the scope of this tutorial mostly this is just to see where you go in order to see the contract and you can take a look at it additionally if a contract has been verified theres two other tabs the read contract and write contract tab these will actually allow you to interact with the contract using etherscan if we had to read contract we can see all of the different functions that are available to us here lets take a look at one of them how about token uri this will actually return the information thats behind a token lets pick token one two three if we query it this will go out to the blockchain and grab the information that is powering this token so we see here that its storing the metadata information on ipfs if we take this value and we paste it into our url bar we can see the actual information behind the nft123 within the doodles project it has an image it has a description and lets take a look at this image now you may notice this has protected slashes in it so well need to fix that instead of those four slashes we just want two regular slashes so we take a look at this nfts image well see it looks like this if we head back to open c and look at number one two three we should see that it matches and it does cool so this allows us to have access to the contract get some more information about the project and see whats going on the transparency of distributed applications and nft projects like this is fantastic you can see exactly whats going on behind the scenes you can also interact with the contract through the right contract tab these functions will make a change to the blockchain therefore they cost gas and you will need to connect your web3 wallet if youd like to do that now we mentioned that this project pulls in some open zeppelin contracts open zeppelin is that industry standard i mentioned if you head on over to you can read more about their contracts again thats a little bit outside the scope of this tutorial but perhaps you want to learn more about solidity more about smart contracts and just more about blockchains in general if you do you can head on over to education here you can learn about smart contracts oracles nfts d5 and a whole lot more so thats all weve got for this one thanks for watching im richard one of the developer advocates at chain link labs and ill catch you in the next one Whether youre looking to buy an NFT on OpenSea or start earning yield in DeFi, Etherscan provides valuable information, links, and tools that help you navigate the Ethereum blockchain. In this video, Chainlink Labs Developer Advocate Richard Gottleber gives an introductory breakdown to analyzing an NFT smart contract using Etherscan. Learn how to view IPFS links embedded in an NFTs metadata, verify that a smart contract is using industry-standard templates, read smart contract functions, and more. Chainlink is the industry standard for building, accessing, and selling oracle services needed to power hybrid smart contracts on any blockchain. Chainlink oracle networks provide smart contracts with a way to reliably connect to any external API and leverage secure off-chain computations for enabling feature-rich applications. Chainlink currently secures tens of billions of dollars across DeFi, insurance, gaming, and other major industries, and offers global enterprises and leading data providers a universal gateway to all blockchains. Learn more about Chainlink: Website: Docs: Twitter: Chainlink ChainlinkEngineeringTutorials,