Questions tagged [decoding]
The decoding tag has no usage guidance.
46
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abi.decode fails to decode Structure
Function reverts when trying to decode this struct:
struct NftProperties {
uint32 dateOfFirstOperation;
uint32 timestampStart;
uint32 timestampEnd;
int64 equivalentCO2;
uint64 ...
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0
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25
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Detecting internal transactions given a debug_traceTransaction response
Intro
Hello everyone, I am attempting to filter and recreate internal transactions given a debug_traceTransaction response and the {tracer: "callTracer"} tracer. An example transaction can ...
- 367
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2
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182
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Fastest way to find the function in a contract from it's selector?
Let's say I have a function selector:
0xa9059cbb
And I have a contract as such:
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;
contract CallAnything {
function balanceOf(address ...
- 5,810
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1
answer
133
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How do I decode call data in solidity?
I have data in memory that is used for a function call, so I guess that makes it call data rather than a calldata (data location). This call data, say bytes memory data, consists of a selector and the ...
- 209
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21
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Decode number of tokens and token contract address from msg.data (ERC-20)
I have a smart contract with just a fallback function and some logic.
I want users to send their tokens directly to the smart contract to do some smart contract logic on receive.
I've implemented ...
- 1
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1
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388
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decodeParameters function python web3?
Is there a function like "decodeParameters" for web3 python?
Regards
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1
answer
212
views
How to compress transaction's input?
Any idea to compress the input data to erase the much zeros
From: ...
- 1
1
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1
answer
293
views
Why use abi encoding/decoding for method parameters? Why not simply separate the parameters in the method signature?
I have seen source codes where they would encode a bunch of parameters into a single bytes parameter and pass it into a function, what's the real purpose of doing it? For example:
function hello(bytes ...
- 277
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1
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48
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Why can't "input data" get decoded in a normal, readable format in an explorer, in some cases?
Let's say, this transaction https://testnet.snowtrace.io/tx/0x86895afcc3768254e5a1257790e95cdcd7402df6c88ed098c012a809a9be3e1d
The function router.swapExactAVAXForTokens was called here. However, in ...
0
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0
answers
221
views
Is it possible to decrypt a signed message given public or private key and message's signature?
a smart contract's function requires a certificate input that should be created using a signed message by the relevant wallet which will call that function.
Is it possible to decrypt that signed ...
- 11
2
votes
1
answer
340
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Unable to decode input using Etherscan ABI
I'm looking at the input for a transaction that calls a Smart Contract and I cannot make sense of it. This specific sample is on FTM, but I'm assuming there is no difference in behaviour to ETH?
...
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189
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How to parse Ethereum transaction input and get token transfers (ERC20)?
I am parsing Ethereum transactions to get transfers of different (erc20) tokens in Java.
I know how to parse transfer, transfer_from, approve function calls, but I have problems with mint and execute ...
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0
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134
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How to parse constructor arguments on contract creation transaction using ethers.js?
Ethers.js has a parseTransaction function that can be used in the following way to extract arguments from any transaction on a deployed contract.
const txDescription = contractInfo.interface....
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1
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861
views
How to send bytes data to contract with web3.py to decode
I'm doing a test and trying to send bytes data to a contract so it can parse, store in variables, and return a value.
Solidity code
pragma solidity 0.6.12;
contract testbyte {
function sendBytes(...
- 51
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1
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82
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How do I parse a bytes32 in solidty?
I have a bytes32 object in memory or storage and I want to parse it into little chunks, for example into one uint8, followed by a bool, followed by uint10, followed by address. How can one do that? I ...
- 209
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0
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372
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Decoding input data from transaction
I'm struggling with decoding the input data from transaction, have tried already everything that I found in similar topics here but all I can retrieve is:
{
"method": null,
"types&...
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0
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450
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How to decode string from bytes 32 in event log that is returned as hex on event log subscribe
I am using the web3.eth.subscribe method to listen for events on a contract.
When an event occurs, I am using the web3.eth.abi.decodeLog to decode the data from the event.
One of the parameters I am ...
2
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2
answers
91
views
How can I decode calls to the songbird network?
for example: I am a multisig signer. And I want to decode the call data that is used to call a specific smart contract.
example on smart contract : 0x02f0826ef6aD107Cfc861152B32B52fD11BaB9ED (WNat)
I ...
- 29
1
vote
1
answer
124
views
bscscan contract argument data decoding
Let's take a look at this tx:
https://bscscan.com/tx/0x9b7cde866e9fe9b9a1c636d0f9686ea5b1920c875d7fcd973baf847bc359c8a9
as you can see it's buying token through pancake swap:
...
- 31
2
votes
2
answers
2k
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Decode input parameter without ABI
I have a transaction with input data that looks like this:
0x2293db5700000000000000000000000030823e060e8be429b34bd9192df9cad4b166a056
I know that the last 40 characters is the token address which ...
- 31
0
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1
answer
2k
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Best way to decode transaction input on the client side
I need to decode transaction input on the client side. Libraries like ethereum-input-data-decoder needs NodeJS dependencies like fs.
Now I decode the one type of contract methods as follows:
const ...
- 157
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1
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171
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How to decode input for tx sent to zero address (contract creation tx)
Decoding transaction input data requires providing ABI. How can I decode transaction input from a transaction issued to "zero" address? This special address is used for creating new ...
0
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1
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487
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How does Solidity decode a struct returned from a delegate call?
I have a proxy contract that delegate calls to a target contract. The proxy is similar to DSProxy.
In it, there is an execute function:
function execute(address target, bytes memory data) external ...
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1
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2k
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Decode raw data within Solidity
If I only have the raw input data of a contract call, what would be the best way to decode it into readable form within Solidity?
"[INPUT]":"...
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1
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333
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How to decode when the input of tracsaction consists of multiple contracts?
I'm testing how to decode the input data of a transaction.
I am currently using Infura and web3py.
In the case of USDT token transfer, USDT ABI and contract address are obtained and decoded through ...
- 61
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1
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263
views
Is it possible to encode and decode two consequent byte arrays (with unknown sizes) using `abi.encode` and `abi.decode`?
Is it possible to encode and decode two consequent bytes using abi.encode and abi.decode (as following)?
bytes memory data = abi.encode(data1, data2);
// later on
(bytes memory data1_recovered, bytes ...
- 290
1
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3
answers
72
views
Would it be possible to integrate crypto with trading bot? [closed]
You can create a trading bot in trading view and see how well your crypto would perform in a given time frame. (I can see how much money would I make if I didn't sell or how much money I would make if ...
- 11
1
vote
2
answers
970
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Decoding Transaction input data in Nethereum
I'm using Nethereum and see this example of how to decode the Input data of a Transaction object. Nethereum Playground C#
This looks like it assumes that you have to know which function data you're ...
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0
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593
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Decoding transaction data using abi-decoder
I'm trying to write a very simple script in typescript that finds uniswap transactions and decodes the transaction data so I can read the function being called and the parameters it is being called ...
- 31
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1
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161
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Method's parameters: a way to know a uint256 is a token amount and its number of decimals?
When decoding transaction actions or logs, I never know how to human-read uint256 values when they are token amounts and, if so, how to know how many decimals they are.
For the decimals, do I always ...
- 101
1
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1
answer
929
views
decode ethereum input data in R [closed]
I am using the etherscan API to get the input data of transactions. However I have no real clue how I can decode the input data into something readable.
For example:
...
- 11
3
votes
1
answer
8k
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how to decode log event of my transaction log?
I receive a transaction event in my log of my Ethereum transaction.
.on('receipt', function(receipt){
console.log("address: " + receipt.logs[0].address);
console.log(&...
- 174
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1
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2k
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abi.decode with pragma experimental ABIEncoderV2 reverts with nested array
I have a function with a parameter of bytes calldata that needs to be decoded to a struct, but the call reverts in assembly. I believe the issue has something to do with the nested array. I have ...
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6
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2
answers
3k
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How to decode a raw transaction in Python?
I have a raw_tx in hex format which I'm going to broadcast via eth_sendrawtransaction JSON-RPC method.
I want to check this raw_tx by decoding it on fields: gas, gas_price, nonce, value, etc.
Some ...
- 287
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1
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156
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Where does the length parameter end and the actual string start in an abi encoded string?
Assuming I decided to ABI encode a very long string (for the purpose of this question I just picked an arbitrary 5-paragraph lorem ipsum text generate by https://www.lipsum.com/feed/html) and get out ...
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2
votes
2
answers
706
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How to decode a transaction to verify its signature in Javascript?
I noticed that it's possible to sign a transaction with a wrong private key. I took the following example found at https://github.com/ethereumjs/ethereumjs-tx
const EthereumTx = require('ethereumjs-...
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0
answers
76
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Given just an Etheruem address, is there any way to tell if it's an ERC20 and/or an ERC721
If I have only an Ethereum address and only a locally running node (using a third party such as EtherScan or Alethio is cheating), is there any way to tell if that address is an ERC20 or an ERC721 ...
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1
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123
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Is Ethereum block header a list?
Decoding a RLP encoded block using Eth specifications do we get header as list? But as per format i.e., [[blockHeader,transactionList,uncleList],totalDifficulty], blockHeader should have been string.
...
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1
vote
1
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737
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RLP decoding for a list
in many standard documentation and many blogs, I have found the example for list with two strings like below
[“cat”, “dog” ] -> C8 83 636174 83 646F67
and thats how it is decoded
1) Retrieve the ...
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vote
1
answer
166
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Quorum how to decode result returned by eth_getQuorumPayload api?
I've read the post How to get decrypted transaction data in quorum?
I followed the api document and got the result by calling eth_getQuorumPayload
curl -H "Content-Type: application/json" -X POST ...
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3
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1
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1k
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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 ...
- 523
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0
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347
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How to decode Tx data? Online tool?
Is there a fast way to decode the data returning from a Smart Contract call? I know there are github projects with JS libraries to decode this kind of data (such as https://github.com/ConsenSys/abi-...
1
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1
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574
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Anyone with knowledge in org.web3j.abi.Type Decoder?
I am trying to decode a String with this code that I found but I have not been able to do it.
String to = inputdata.substring(10, 74);
String value = inputdata.substring(74, 138);
Method refMethod = ...
1
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1
answer
960
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How to decode the input data in java?
I receive the input data as the image shows. And when I try to decode it with the method:
String inputdata = null;
Optional<Transaction> tx = web3.ethGetTransactionByHash(txHash).send()....
2
votes
1
answer
2k
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How to unpack/decode parameters encoded with web3.eth.abi.encodeParameters in Solidity?
My client app (nodejs) packs some arguments to pass to a smart contracts as bytes _data (similar to ERC223 calls with fallback). I pack the arguments in my JS client like this:
const packedArgs = ...
- 1,067
15
votes
3
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6k
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How can I easily parse a raw transaction?
In the Bitcoin ecosystem, there are tools like https://blockchain.info/decode-tx to decode a raw transaction. Is there a site that offers the equivalent for Ethereum?
I'm looking for an easy way to ...