Questions tagged [data]
The data tag has no usage guidance.
27
questions
1
vote
4
answers
46
views
Specific Block Data?
How can I get data from a specific block in the past? Does node providers support archive node? Any suggestions are welcome.
- 193
0
votes
2
answers
78
views
What are the GraphQL API providers for blockchain data?
I know there are RPC providers like QuickNode and Alchemy
Irwing Tello
- 85
2
votes
1
answer
341
views
How can I decode the emitted event data field using Foundry Cast in Ethereum?
I'm trying to extract relevant information from the event but I'm not sure how to decode the emitted event data using cast. Any tips or resources would be greatly appreciated. Thank you!"
E.g for ...
- 597
1
vote
0
answers
25
views
"How to limit the function call for all users except those who have a special token with the address 'X'?"
hi i'm continuing to explore solidity. I wrote a contract which contains 4 functions: addAuthorizedAddress, removeAuthorizedAddress, storeData, retrieveData. The last two: storeData and retrieveData ...
- 127
1
vote
1
answer
129
views
What's the best way to verify an address is correct in C#?
Is there an easy way to validate an Ethereum address in C#?
Basically, I am looking for the method that correspond to these ones in Javascript but in C#.
- 641
0
votes
1
answer
16
views
Is there a way to enable logs for graph commands?
I am running the following version of graph-cli: @graphprotocol/graph-cli/0.42.4 linux-x64 node-v18.15.0
Is there a way to setup a log or have more details after each command gets executed?
- 641
0
votes
0
answers
11
views
how to collect ethereum data?
I modify the geth source code.I collect some data on Rinkeby and store them by MySQL successfully. I plan to connect to mainnet and launch the prysm.However nothing is collected.Is there any ...
- 1
2
votes
1
answer
237
views
Best way to store private data in smart contract
I wanna to store some personal data as a string to my smart contract with simple store function like a note:
mapping (address => string[]) private addressToNotes;
function store (string memory ...
- 350
2
votes
3
answers
351
views
DEX Real-Time Data
I have a project that tries to retrieve real time data from UnisWap V2 and SushiSwap I have already figured out how to get real time data from Sushi using api but it's not the same for Uniswap API ...
- 31
1
vote
1
answer
99
views
contracts being deployed via 0x61088480
Lately I am coming across different deployment tx data patterns. I am already familiar with how the free memory pointer is shifted from the usual 80 when there are immutables in the code (great ...
0
votes
1
answer
18
views
Which one is gas efficient?
Lets say i want to store some data about each address ,through the mapping.
My first idea is: store in struct this way:
struct user {
address userAddress;
uint256 someUint:
string someString;
...
- 350
0
votes
1
answer
92
views
Comparison of gas cost in different types of data storage
I want to compare gas fee of different types of data includes: String, bytes, uint, bool, int, address and etc... does anyone knows how much they costs? or share a link about this?
Thank you
- 350
0
votes
1
answer
15
views
Contracts design
I have a project where users deploy their own instances of a contract and those instances need off-chain data through chainlink oracle, what's the best between making the contract has its own request ...
- 328
2
votes
1
answer
73
views
call a function in the same contract
i have a contract who containt a function onTokenTransfer(address _sender, uint256 _fee, bytes memory _data), when i transfer some ERC-20 Token using ERC-677 function transferAndCall, the function ...
- 328
1
vote
1
answer
117
views
ERC677 transferAndCall
i want to send some LINK to a contract B from a contract A, and in the same function call a function in contract B, im using transferAndCall(address _to, uint _value, bytes _data) function in the ...
- 328
1
vote
2
answers
68
views
What field is used to pass on transaction information? input field or data field?
In the documentation here under the eth_sendTransaction, it shows/states that in the transaction object sent, there is an input field.
But in the documentation here it says there is a data field.
My ...
- 448
0
votes
1
answer
579
views
How to fix decoding transaction data giving wrong output in ethers-rs?
I am trying to decode the hex data of a transaction. For testing purposes I am using the transaction that can be found here https://kovan.etherscan.io/tx/...
- 448
1
vote
0
answers
44
views
How do you find every self-destructed contract using geth?
I'd like to use my go-ethereum node to find every self-destructed contract in the history of Ethereum and get their addresses.
What is an efficient way to do so?
- 10.2k
1
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2
answers
236
views
Are there any data sets available for download of all addresses that have been used?
Since etherscan indexes all addresses that have been involved in any transaction i was wondering if such a data set is available for download anywhere?
I cant find anything on etherscans website and ...
- 253
0
votes
1
answer
48
views
How data is being retrieved from the blockchain using only the address of a smart contract
Sorry if I didn't fully clarify the question; it was quite challenging for me to do so.
This is a smart contract
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
contract GameItem {
...
0
votes
1
answer
79
views
Accessing historical data for validators from the API
I have been trying to pull the validator-level data for ETH for a project I am working on. I am using this API and have been unable to find a command I need. Ideally, the request URL would either ...
- 1
0
votes
1
answer
309
views
Wallet mobile app that allows sending transactions with data to smart contracts on BSC?
I have tried about a dozen crypto wallet apps on Android, including Metamask, and I haven't found a single one that:
supports BSC (BNB Smart Chain)
allows me to manually initiate and send a ...
- 105
0
votes
1
answer
48
views
how to get NBA data
Hello everyone I need NBA data in my smart contract so I used some chainlink jobs but they don't provide specific data about the teams or players , is there any node that can help ? or is there ...
- 17
1
vote
0
answers
17
views
How to make Enums scalable? [duplicate]
Let's say that I have a contract Games.sol containing an enum with multiple games.
enum { TicTacToe, PacMan, Chess }
This enum is currently imported from a library and I think that it's immutable, so ...
- 564
1
vote
0
answers
20
views
Is there a particular reason as to why evm adresses are only 160 bits and not 256 bits? [duplicate]
Is there a particular reason as to why evm adresses are only 160 bits and not 256 bits?
Wouldn't that create a pigeon hole problem eventually? Is this solely to save 96 per addresses so to decrease ...
- 81
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votes
1
answer
20
views
Can I integrate files within a smart contract?
I want to create a smart contract, let you use files like docx, doc, pdf etc. with the reason of keep those files in the smart contract system and use them when the users of the smart contract ...
1
vote
1
answer
221
views
Retrieve a non-constant/non-view transaction's return (output) data with hardhat/ethersjs
I'm trying to figure out if it's possible to retrieve the return value of a non-view function. Specifically, I want to see the return value of a newly created contract
I have created a simple setup to ...
- 1,555