Questions tagged [decoding]
The decoding tag has no usage guidance.
29
questions
0
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16 views
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 ...
0
votes
1answer
21 views
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 ...
0
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0answers
37 views
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
votes
1answer
31 views
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 ...
0
votes
1answer
136 views
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]":"...
0
votes
1answer
81 views
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 ...
0
votes
1answer
17 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 ...
1
vote
2answers
34 views
Would it be possible to integrate crypto with trading bot?
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 ...
1
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0answers
140 views
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 ...
0
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0answers
65 views
Solidity beginner exercise: Santa'slist
I am trying to implement the following exercise "Santa's list": Build a system for tracking who is on their nice list and who is on their naughty list.
Furthermore, I do not want duplicates ...
0
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0answers
32 views
0
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1answer
80 views
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 ...
0
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0answers
75 views
How to read all logs from a transaction without having each contract ABI?
From a transaction logs, how do I decode every logs since I don't have all contracts ABI? Do I have to fetch the ABI every time I encounter an unknown contract?
How do apps that display all logs deal ...
1
vote
1answer
686 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:
...
2
votes
1answer
2k views
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);
...
0
votes
1answer
757 views
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 ...
3
votes
1answer
1k views
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 ...
0
votes
1answer
51 views
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 ...
2
votes
2answers
366 views
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-...
1
vote
0answers
44 views
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 ...
0
votes
1answer
69 views
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.
...
1
vote
1answer
428 views
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 ...
1
vote
1answer
142 views
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 ...
3
votes
1answer
861 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 ...
1
vote
0answers
284 views
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-...
asked Jan 23 '19 at 9:28
Juan Ignacio Pérez Sacristán
3,0327 gold badges34 silver badges64 bronze badges
1
vote
1answer
330 views
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
vote
0answers
622 views
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
1answer
2k views
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 = ...
15
votes
3answers
5k views
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 ...