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Address to Interact With Ethereum

Using sbt-ethereum to interact with Ethereum Smart Contracts

In the last article, we learned how to create and manage wallets and addresses using sbt-ethereum, so we strongly recommend reading that article first. This week, we will learn how to interact with Smart Contracts using sbt-ethereum!

First, start sbt-ethereum by moving into sbt directory and running this command:
Now let’s check our basic set up:

These commands will help us know a couple of things:

  • Which addresses are configured and what are their alias names?
  • What is current Ethereum network ID (chain ID)?
  • What is the configured node URL?
  • What is the balance of my default-sender address? (you can check for other addresses too!)

Remember, sbt supports rich tab completion, so use that!

Let’s switch to Ethereum testnet Ropsten :

  • Change chain ID using this command ( Ropsten network ID — 3)
  • Change Node URL3

By default, sbt has configured a Node URL for all the networks (they don’t recommend it for production), but if you want to use own URL you can set it by using this command. Wanna run your own Ethereum Node? Signup for QuikNode .

  • Create a new Wallet:
  • Let’s give an Alias to our address, so we don’t need to copy paste it again:

Now, if you don’t have any Ether, get it from the Ropsten faucet. Once you get the testnet Ether, you can check your balance using:
Here, ropsten is an alias we gave to our wallet address.

Interacting with the Smart Contracts

Let’s interact with a Smart Contract now. I have deployed a Smart Contract on the Ropsten network so we can play with it. Here is the deployed Contract at address 0xBaC18C78D7BEAEbc99EBc2C3392Befe9b3A6A347

To interact with the Smart Contract, we need to first load it on sbt . Let’s see how we’ll do that:
Create an alias for contract address:

Just double check if it is set correctly using ethAddressAliasList .

Next, we need to upload the ABI of the fortune contract, so we can run contracts functions using the command line. There are two ways to load an ABI on sbt :

  1. Manually
  2. Using Etherscan API

Yes, you can integrate Etherscan with sbt! But we do this manually in this tutorial. To get the ABI, follow these steps:

  1. Go to http://ropsten.etherscan.io/ (our contract is on Ropsten network)
  2. Plug the address of the contract — 0xBaC18C78D7BEAEbc99EBc2C3392Befe9b3A6A347 — into the search field in the upper right and hit «Go». ( Etherscan doesn’t know anything about our sbt-ethereum alias fortune, so we can’t use that!)
  3. On the page that comes up, look for a tab that says «Code» with a small green checkmark. Click on that.
  4. Scroll down until you see the «Contract ABI» section.

Copy the ABI using the copy button at the top right corner of the Contract ABI box.
Next, upload this ABI on sbt using below command:

Here fortune is an alias for our contract address, remember?
Before calling Smart Contract functions, we will override our default sender address, so all the transactions go through that address.

Here ropsten is alias name for our wallet address.
Before moving forward, make a back up here. Always make backups! Otherwise, your work may get lost.

Calling Smart Contract Functions

Now we’re all set! We can call Smart Contract functions now.
We have two types of command to interact with the Smart Contract:

  1. ethTransactionView — For reading from the Smart Contract
  2. ethTransactionInvoke — For writing into the Smart Contract

Our contract has some functions like:
addFortune — To add a new fortune

countFortunes — To get the total number of fortune
drawFortune — to randomly draw a new fortune.

And fortunes array, where all the fortunes are stored.
So let’s draw a fortune:

Let’s also add a fortune using this command:

This will ask your passphrase (which you used while creating the wallet), create the transaction, and submit it. Once mined, it will print the transaction receipt in the terminal. Below is how it looks like:

You can check our fortune message from the fortunes array too.
Here you can see how we are passing 1 as an argument. When you will Tab, it will show what kind of variable you need to pass. Below is an example:

Conclusion

That’s it for today! In the next article, we will create and deploy a Smart contract using sbt command line. Let us know what you think in the comments section below!

About QuikNode

QuikNode is building infrastructure to support the future of Web3. Since 2017, we’ve worked with hundreds of developers & companies, helping scale dApps and providing high-performance Ethereum nodes. We’re working on something interesting from the past few months and will be launching soon, so subscribe our newsletter for more updates!! ��

Next, we have to access the Ethereum Name Service DApp. As we are using Trust Wallet, it will automatically establish a web3 connection. Just make sure to check that the ETH address you want to be ENSified is correct.

Getting a

Bitquery explorer allows you to visualize transactions and addresses associated with a particular address. You can check money inflow and outflow, as shown in the following video.

How to investigate an Ethereum address

You can check money inflow and outflow, as shown in the following video.

Associated addresses and Transactions (читать далее...)
Note: In this article, we will show the Ethereum blockchain as an example; however, our tools support 20+ blockchains. Therefore, you can investigate addresses and transactions for all those blockchains.

Visualizing an Ethereum address

A combination of these two APIs will quickly provide your fund’s origin and destination and we also annotate address, which gives you the ability to identify exchanges, smart contracts, wallets, and other crypto services. Inbound addresses received coins or tokens from ana address in a number of hops

About Coinpath®
If you have any questions about Coinpath®, ask them on our Telegram channel or email us at hello@bitquery.io. Also, subscribe to our newsletter below, we will keep you updated with the latest in the cryptocurrency world.
If you have any questions or need help with your blockchain investigation, just hop on our Telegram channel. Also, let us know if you are looking for blockchain data APIs.

Outbound addresses received coins or tokens from ana address in a number of hops

Therefore, you can investigate addresses and transactions for all those blockchains.

Using Coinpath APIs

Coinpath APIs provide blockchain money flow analysis for more than 24 blockchains. With Coinpath’s APIs, you can monitor blockchain transactions, investigate crypto crimes such as bitcoin money laundering, and create crypto forensics tools. Read this to get started with Coinpath®.

Внимание! Это техническая статья, рассчитанная на блокчейн специалистов и объясняет как генерируются ключи внутри блокчейна.

Понимание концепции закрытого ключа, открытого ключа и адреса в блокчейне Ethereum

Это техническая статья, рассчитанная на блокчейн специалистов и объясняет как генерируются ключи внутри блокчейна.

Простой пример (читать далее...)
Если Вам нужна помощь в открытии и сохранении своих приватных ключей, то обратитесь к статье: Как установить холодный кошелек Ethereum

Генерация ключей в Ethereum

Прежде чем мы углубимся в концепцию блокчейна Ethereum, важно понять, как генерируются открытый ключ, закрытый ключ и адрес. Закрытый ключ (Private Key)

Открытый ключ (Public key)
Существуют стандартные библиотеки для генерации пары ключей Ethereum более безопасным способом. В этой статье, просто для демонстрации, мы будем использовать библиотеку Javascript для выполнения операций с эллиптической кривой.
Чтобы сгенерировать адрес Ethereum, возьмите хеш открытого ключа Keccak-256. Самые правые 20 байт — это и есть ваш адрес Ethereum.

Адрес Эфириума (Ethereum Address)

Если Вам нужна помощь в открытии и сохранении своих приватных ключей, то обратитесь к статье Как установить холодный кошелек Ethereum.

«Для данного закрытого ключа, pr, адрес Ethereum a (pr) (160-битное значение), которому он соответствует, определяется как самый правый 160-битный хэш Keccak соответствующего открытого ключа ECDSA.»

Hi, I; m Dave Kiss

Сетевой протокол Ethereum с нуля

§ Чтобы сгенерировать ключ, вызовем конструктор Private Key с None в качестве аргумента, а затем запишем вывод функции serialized() в файл:
Geth — это Ethereum-клиент, реализованный на Go. В этом репозитории файл /bootnodes.go содержит списки узлов начальной загрузки в специальном формате:

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