Questions tagged [hex]

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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; ...
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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 ...
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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 ...
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Brownie, Python, and Unit testing Merkle Trees

I've been trying to unit test a merkle-tree whitelist with Brownie and Python. If I grab the abi.encodePacked address, I can encrypt it fine. However, I don't know how to take a string-based address ...
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Can someone HELP a NOOB with Hex crypto

Please someone help me! I am very new and so freaking confused about Erc20 crypto tokens. I have an app I use called Hex Network and I have "mined" a good bit of Hex and have made 3 ...
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Send fixed Event using assembly on Solidity

Is it possible to send an event in hex format? I mean, I want to send the event to the EMV from an Smart Contract without using the function log/event. I want to send a raw chain of bytes directly to ...
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How to make wallet address start with 0x1111111? [duplicate]

The 1inch contract address is 0x11111112542D85B3EF69AE05771c2dCCff4fAa26 on Etherscan. How did they make it have all those 1's at the beginning when these hexadecimal names are usually randomly ...
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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, ...
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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: ...
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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 ...
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How convert hex number to decimal in solidity?

I would like to convert a hex number to decimal.
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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#...
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Understanding serialized signed raw transaction

I try to understand how the raw transaction hex is generated. This website provides an example script: https://besu.hyperledger.org/en/1.2.0/Using-Pantheon/Transactions/Transactions/ My inputs are: ...
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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/...
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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 ...
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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 ...
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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 ...
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Solidity: Converting a hex-string into bytes efficiently

I need to convert a string variable (passed to a function), containing a hex-string, into bytes in Solidity. In a way, this is the same as the following, just that the string variable will be passed ...
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Understand txdata in ethereum

I have the following output: initialize(string,string,uint8), txdata: ...
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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,...
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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/...
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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 "...
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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 ...
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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: "...
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Why does ethereum JSON RPC encode bytes as hex?

Why not use base64 since it would be more compact?
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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, ...
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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'...
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3 votes
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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 ...
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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, _ :=...
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1 answer
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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 ...
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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 ...
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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 ...
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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 ...
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