Questions tagged [hex]
The hex tag has no usage guidance.
33 questions
0
votes
0
answers
11
views
Padding in blob chunks?
I was going through ethereum blobs trying to calculate how much of the data space is actually used. I understand that when the space of a blob is not filled, it is padded with zeros to the end of the ...
- 1
1
vote
1
answer
71
views
Number of events in Solidity code vs on Etherscan
Hey guys I have a simple Solidity code, which emits events shown in the code bellow.
What I don't understand however is that on Etherscan I get many sections with events that I have never coded. Why ...
- 373
1
vote
1
answer
136
views
Is there "any" advantage in using "hexadecimals" for calculation instead of using 'big numbers"?
I would like to know if there is "any" advantage, like speed of execution for example by using "Hexadecimals" instead of "big numbers"? If so can you please tell the ...
- 267
1
vote
1
answer
295
views
Whta's difference between web3.utils.toHex() and web3.utils.keccak256()?
I've been practicing Ethernaut CTF and I'm stuck on the Delegation problem.
First, I tried to approach this in the console. But I couldn't get ownership.
var pwn = web3.utils.toHex("pwn()")
...
- 385
1
vote
2
answers
474
views
solidity hexadecimal error code
i know hexadecimal charchter ( 0 1 2 3 4 5 6 7 8 9 A B C D E F)
when i write code
string a= hex"011a" //it is ok
but when write this code
string a=hex"011aa" // get Error
why? ...
0
votes
1
answer
2k
views
How To Convert Hex String to A Uint in Solidity ^8.0.0
I have this function that converts a unit to a hex string:
function uintToHexString(uint i) public pure returns (string memory) {
if (i == 0) return "0";
uint j = i;
uint length;
...
- 173
0
votes
1
answer
795
views
How to format hex string to solidity address?
Say I have a hex string c4ef705a8a8f2db126b92013b4938230df2158b5 how can I format it as a solidity address using ethers js or another npm package to prepend 0x and correctly capitalise some of the ...
- 1,855
0
votes
1
answer
5k
views
How to decode the hex string of an eth_sendRawTransaction request in Alchemy?
I'm using an Alchemy rpc endpoint to facilitate all my MetaMask transactions. I sent a transaction a few hours ago and it's stuck in pending, and now every few seconds (or.. every time I open MetaMask ...
- 475
0
votes
1
answer
128
views
How to converted a string into four numbers in smart contract?
I want to have a string that can be converted into four numbers.
For example, it converts a string from E17B1237 into (225, 123, 18, 55), this is converted from hexadecimal into decimal.
E1 => 225,
...
- 177
1
vote
1
answer
617
views
How to decode a raw transaction in Python? (superfluous bytes error)
I have a raw_tx in hex format. I'm using the following code to convert it from hexstr to a readable JSON text format. The issue is that I'm receiving the following error for certain transactions: ...
1
vote
1
answer
1k
views
How to tell whether a 0x address is a wallet or a contract?
This as an Ethereum wallet address:
0x983110309620D911731Ac0932219af06091b6744
This is a token contract address (ERC-20, WETH):
0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2
As you can see they are ...
- 1,568
1
vote
1
answer
914
views
How convert hex number to decimal in solidity? [duplicate]
I would like to convert a hex number to decimal.
0
votes
0
answers
1k
views
Constructing hex data payload for contract interaction
I am trying to construct the data payload as described here and quoted below for interacting with a contract:
https://github.com/ethereumbook/ethereumbook/blob/develop/06transactions.asciidoc#...
- 101
0
votes
1
answer
1k
views
Is it possible to send message in inputData for ERC20 contracts?
There is a transaction on the Rinkeby testnet that has a message encoded in the input data of the transaction
https://ropsten.etherscan.io/tx/...
- 553
0
votes
1
answer
50
views
String to Bytes Converts to Incorrect Value
I have a string array stored in memory as
https://cloudflare-ipfs.com/ipfs/QmSXDsFeNaPa3CJKmn8WKBnA421Zv5r3Ra8n71LZhvEi9s
This should convert to ...
- 299
0
votes
1
answer
108
views
Encoding arguments for UniswapV3 trade function
I am trying to encode arguments to call the UniswapV3ExchangeAdapter through the Set-Protocol TradeModule. The UniswapV3ExchangeAdapter has a function which is called generateDataParam that given hops ...
- 407
0
votes
1
answer
1k
views
Decode hexadecimals gas and gas price values "0xd9c5"
Hello i have following kvp:
{
gas: "0xd9c5"
}
But the ABI do not have gas func and the interface is not able to decode it, any idea how to decode the gas to extract the value when is ...
- 365
1
vote
1
answer
123
views
Understand txdata in ethereum
I have the following output:
initialize(string,string,uint8), txdata: ...
- 265
4
votes
1
answer
1k
views
How do you handle the hex prefix without the value (only "0x")?
First, I'm caling function foo() (from another contract) that returns me a uint in the form of bytes.
Then, I'm using BytesLib.toUint(foo(), 0) to retrieve the uint.
When the value is supposed to be 1,...
0
votes
2
answers
1k
views
How many UTF-8 chars can you fit in a 256 bit hex word?
In Ethereum transactions, you can use the Data field to send text. Here's an example testnet transaction.
https://ropsten.etherscan.io/tx/...
- 241
0
votes
1
answer
454
views
Check if calldata contains string
I have a function that is called with some data - "SOMETHING".
function checker(address _from, uint _value, bytes calldata _data) external{
//HOW to check if _data contains "...
- 150
1
vote
1
answer
604
views
Hyperledger Besu: Unable to decode the hex string returned by solidity function containing multiple values
I have set up a Hyperledger Besu network for private transactions using Orion.
I am using a javascript client to write to and read data from a smart contract
written in Solidity. I am following the ...
8
votes
2
answers
29k
views
Convert String to Hex using ethers.js
If I use web3.js I can convert a string to hex with:
web3.utils.toHex('4c7b7ffb66b344fbaa64995af81e355a')
How do I use the same utility for ethers.js?
- 12.4k
3
votes
1
answer
1k
views
json rpc hex string weird padding/encoding
When sending eth_call to get erc20 token WETH name and symbol I get hex response padded with bunch of zeros and a mysterious digit '2'.
for symbol I get response:
"...
- 157
1
vote
0
answers
335
views
Why does ethereum JSON RPC encode bytes as hex?
Why not use base64 since it would be more compact?
- 396
2
votes
1
answer
6k
views
web3 - web3.utils.toHex zeros length
I'm trying to send 12 integer as bytes to a contract function. If I use
web3.utils.toHex(12)
the variable will become 0xc
The problem is that when contract function parses bytes, it reads uint256, ...
- 791
2
votes
0
answers
216
views
Pass hexadecimal literal to contract using web3js
I have a hex literal that I need to pass into a contract using web3, and I'm not sure how to go about formatting it. In solidity, its formatted like so:
hex'...
- 21
3
votes
1
answer
2k
views
Encoded input params
I created a simple test contract with a single method:
pragma solidity ^0.4.24;
contract SimpleTest {
function testFunc(string name, bool isFirst) public {
//do stuff
}
}
I'm ...
- 825
0
votes
1
answer
868
views
Converting Log Topics to int64 correctly in Go
I currently use the code below to extract the ERC721 Token ID from Transfer Event Logs:
txHash := newLog.TxHash.Hex()
hexString := common.BytesToAddress(newLog.Topics[3].Bytes()).Hex()
flowerNum, _ :=...
- 138
2
votes
1
answer
238
views
Leaf node with encodedPath containing only Hex-Prefix in Merkle Patricia Trie
A leaf node is defined as the tuple [encodedPath, value], and encodedPath uses the Hex-Prefix encoding. Is it possible we have a leaf node with encodedPath having only the prefix and no partial path ...
1
vote
1
answer
918
views
Better ways to test bytes32 type using truffle testing framework
small quick question, when I store a bytes32 and retrieve it from truffle console, why is it showing in 64 bits?
Ex: 0x74657374737472696e6700000000000000000000000000000000000000000000
because this ...
- 1,164
1
vote
1
answer
884
views
web3.toAscii for foreign languages
I have a function that takes bytes32 _name as a parameter and store it in a struct.
Let's say _name is either Chinese, Korean, or Japanese and from app.js I would convert the _name to hex to pass it ...
- 1,164
0
votes
1
answer
531
views
Python How to make Filter topics: encode integers to its hex string representation
In the documentation: http://web3py.readthedocs.io/en/latest/filters.html
Quote "Subsequent topic items are the hex encoded values for indexed event arguments. In the above example, the second item ...
- 1,814