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Can we get the number of transaction of a wallet address inside a smart contract? [duplicate]

I am trying to allow only those wallets to interact with my smart contract who have at least some transaction history from past. I am thinking to somehow see the number of transactions the wallet has ...
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2answers
737 views

About contract kill and forensic investigation

Let’s say that I created a contract and, using that, I and other people, made many transactions which meaning is undoubtably proven reading the contract. At a certain point someone kills the contract ...
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How to enable mail server (mailserver) when starting a whisper node by using “geth”?

As title, I can't find any flag about enabling the "mailserver" when starting whisper node. However, I found a Diagnostic Tool called "wnode":https://github.com/ethereum/go-ethereum/wiki/Diagnostic-...
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1answer
15 views

Show truffle migration history

What is the best way to show truffles migration history or at least the last successful step. Something similar what I see when I do truffle migrate: Running migration: 1_initial_migration.js ...
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3answers
117 views

How to setup 'topics' for function getPastLogs ()?

Sir, I want to read the past event log by using getPastLogs(),but I got the whole log.I hope I can filter some log. I find I can setup the 'topics' in getPastLogs(),but it always fails. How ...
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2answers
130 views

How to maintain history of changes in mapping?

I have a mapping variable in my solidity code which maps address to name. I want to maintain the history/log of every change that happens in this mapping. What is the best possible solution to it?
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0answers
28 views

Best way to restore historical storage state

What is the best way to get historical storage state, given db with current world state and blockchain data? Do I need to reverse assemby code or can I do this using receipt logs?
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0answers
97 views

Gas SafeLow historical data

I am doing some gas analysis work and I really want to find or generate a dataset for historical SafeLow gas prices as defined by EthGasStation: “A price that at least 5% of the network hashpower ...
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0answers
24 views

What use case do peers have on test net?

Hi I am new to Ethereum (and Blockchain) and am trying to set up testnet using Geth to learn about about the intricacies of Blockchain. So this might be a trivial question: A lot of tutorials out ...
1
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1answer
305 views

How to get value history from ERC721 Token

I'm trying to figure out HOW to get a sort of "history" of values for a specific ERC721 (for instance KnownOrigin) What are the important items to consider? Is something feasible via Smart Contract ...
3
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2answers
2k views

Get Balance History of address

In building an IONIC app, I am attempting to retrieve the historical balance of a single Ethereum address. I am currently not sure how far back I will need to go. I know that Etherscan.IO offers a web ...
3
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1answer
842 views

Significance of '60' for cointype?

When constructing the path for a node in a wallet tree, the default value for cointype is 60 for ethereum. Why is that?
2
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1answer
45 views

Is there a way to prove to a third party that you are the recipient of a transaction?

Let's say that someone sends me some ETH. How can I prove to a third party that I am the actual recipient of that transaction? The third party is anyone with access to the blockchain. In other words, ...
2
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1answer
2k views

Parity Full History Node

I'm trying to setup personal full node in archive mode (whole history) on server with this parameters: Intel i3 3.4GHz 8GB DDR3 1333 MHz 2TB HDD 100 Mbps / 128 I was expecting issues with HDD speed (...
2
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2answers
732 views

Ether scan api, compute balance on the date

I need calcualete balance on the date to acconut, but web3 balance and etherscan.com api is missmath. How correct to calculate balance from the available data of api. const web3 = new Web3("https://...
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1answer
906 views

How to get value of input parameters from Transaction history

I would like to read a successful transaction on an ETH block and I would like to get the values of input parameters that were passed to the function for that transaction. I am not talking of the data ...
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1answer
2k views

How can I call transfer function of a ERC20 token contract from another contract?

I want to exchange token for a commodity using smart contracts. I have deployed my token contract address in my private block chain network. How should I create another contract that exchanges a ...
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2answers
675 views

How does the EVM ensure perfect determinism and what does that mean?

I've read What was the reason to invent the EVM? but I feel like it didn't fully answer the question. So I have a couple of followup questions regarding the EVM: Why does the EVM ensure perfect ...
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1answer
1k views

Why are the Rinkeby and Ropsten testnets named after Swedish locations?

Why are the Rinkeby and Ropsten testnets named after Swedish locations? I know what they are but am wondering why they were named this way.
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2answers
1k views

How to get all historic changes of a state variable in a smart contract?

Blockchains are known to be immutable because all transactions of cryptocurrencies and state (data) changes. However, looking at ethscan does not provide any information on the output of a smart ...
11
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1answer
9k views

Why is the Ethereum paper called the “yellow paper”?

I googled this and this does not exist here yet, so Why is the Ethereum paper called the "yellow paper"?
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1answer
2k views

Why was RLP chosen as the low level protocol encoding algorithm?

Is this an ad-hoc decision? Why RLP? Is it specifically suited to something?
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2answers
2k views

Why did Ethereum not start with Proof of Stake?

I had been reading up on Proof of Stake and the advantages and disadvantages. As if I am correctly informed, it is planned to change from PoW to PoS in the near future, using Casper. I had also been ...
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3answers
21k views

How can I view event logs for an ethereum contract?

After reading the this post, it seems like I should be able to access the logs of events that have been called on an Ethereum contract. The section I am interested in is Option 3 which is using event ...
4
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1answer
47 views

How can I get crowdsale data?

Is there anywhere an access to crowdsale data gathered in a similar way as this kicsktarter data -- https://webrobots.io/kickstarter-datasets/ ?
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2answers
3k views

Please provide a summary of the Ethereum hard forks

The question Please confirm what the hard forks of Ethereum were and when they took place was asked on Reddit by u/Tykerr.
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2answers
2k views

Is it possible to access storage history from a contract in solidity?

With web3, I can access the history of the blockchain like this: web3.eth.getBalance('0x1234') // returns current balance at address 0x1234 web3.eth.getBalance('0x1234', 1000) // returns balance at ...
15
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1answer
684 views

Why were empty accounts allowed to be on the blockchain?

It's hard to see what the benefits of allowing empty accounts to be on the blockchain are. This was a known subtlety (see "note: there is a difference between zero-balance and nonexistent") and ...
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0answers
947 views

What is the easiest way to view transaction history if a custom token?

What do you think it's the easiest way to view history of transaction for a custom token ? Like A sent X to be B on XX/XX/XXXX. Especially for people who don't know about Ethereum. A tool like ...
3
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1answer
278 views

How did “The DAO” come about? What was the process of its formation?

How did "The DAO" come about? What was the process of its formation? Who "made" it happen?
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2answers
17k views

What was the approximate cost of 1 ETH during pre-launch (Aug 2014)

The ETH pre-launch allowed people to exchange Bitcoins for ETH at a determined value. What was this exchange rate in USD? E.g. 1 Bitcoin got you X Eth, which was worth about $Y.
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2answers
3k views

How was the name “Ethereum” chosen?

How was the name "Ethereum" chosen? Is there a meaning or story behind it? Did Vitalik Buterin choose it or did someone else?
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2answers
2k views

Who coined the term block-chain?

I'm interested in learning the essence and background of this community and the concepts it is built upon. Beyond who founded Ethereum, who is responsible for coining terms such as block-chain? Why ...
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1answer
191 views

Is ethereum based on bitcoin?

There are many discussions about so called altcoins. Is Ethereum an alternative coin? Is Ethereum even a coin? (This is a canonical question to gether answers and resources on that subject.) Is ...
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3answers
2k views

What are GavCoins and what is their significance?

Quite simply, what are GavCoins and what is their significance?
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1answer
293 views

Main use cases between Open Blockchain and Ethereum

Looking at Open Blockchain's use cases and it appears a lot of these can be done or are on Ethereum, examples: multi-sig contract activation, execution, atomicity of contract execution, reusable ...
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1answer
147 views

What is the C-Like Language CLL?

There are some older projects, dated back to 2014 which develop contracts in CLL, C-Like Language. What is this and is this still being developed/used?
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2answers
27k views

Ether Historical Prices

I am looking for historical datasets of the price of Ether. Similar to Bitcoin closing market price on blockchain.info or Coindesk OHLC dataset. Datasets in raw form are preferred (.json or .csv). ...
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2answers
2k views

Why was Frontier's “default” gasLimit = 3141592?

I've noticed this number at least in two places: On the Ethereum Network Status web page. In the sources of pyethereum. The number looks suspiciously familiar, and I keep asking myself: "Where ...
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1answer
696 views

Is Mutan still used as language?

Mutan was designed by Jeffrey Wilcke as a Go-like language for contract development. Is it being used and developed / maintained?
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2answers
5k views

What are the contract languages?

Besides Solidity and Serpent, what are the other (experimental) contract programming languages?
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2answers
3k views

Is LLL still used as language?

What is the state of the contract programming language LLL (Lisp-Like Language)? Is it still used and supported?
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1answer
119 views

Who keeps the Ether when a transaction triggers an exception?

An audit had "Strong Recommendation: We recommend that exceptions cause all value to be returned to the sender, not the recipient." What were the technical reasons for not implementing this ...
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4answers
13k views

Why don't Ethereum addresses have checksums?

A checksum, similar to its use in Bitcoin addresses, can primarily prevent mistyped or invalid addresses from being used, before a transaction with an invalid address is constructed. Why don't ...
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4answers
34k views

The Ether denominations are called Finney, Szabo, and Wei. What/who are these named after?

This was recently asked on Reddit. To expand, who are Finney, Szabo, and Wei, and what did they do/contribute to the project that warranted being awarded denominations?
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1answer
1k views

How was Solidity conceived and what design tradeoffs were made when building it?

Solidity is a new language designed specially for writing Ethereum smart-contracts. As compared with Serpent, which is an extension to Python semantics, Solidity is completely new and borrows ...
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2answers
1k views

Who is the person behind Ethereum? [closed]

Is Vitalik Buterin a real person or a pseudonymous name like Satoshi Nakamoto? I see videos and pictures of him. But is he really the person behind Ethereum?
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3answers
3k views

What was the reason to invent the EVM?

What was the reason to invent the Ethereum Virtual Machine (EVM)? Why not use an existing virtual machine like the Java-VM. The big advantage would be that the existing toolsets for Java development ...
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3answers
10k views

How were gas costs chosen for the Ethereum Virtual Machine instructions?

Different instructions of the EVM have different associated gas costs -- you can look at the list of the gas-prices in the appendix G of the yellow paper. While the rough magnitudes of those numbers ...