All Questions
10 questions
6
votes
1
answer
15k
views
Execute transaction Approve directly against contract address (without ABI)
Solved
For now, you will always need the ABI to execute a call against the ethereum network with web3. A simple way is to reconstruct the function you wish to execute is to, either create a separate ...
0
votes
1
answer
80
views
How can I implement redactable chain for ETH?
I am trying to research about Redactable blockchain so my question is how can I implement a Redactable chain in Eth if someone has some idea about it I will be thankful
- 1
3
votes
1
answer
496
views
Create Accounts Using Web3.js in Browser
TL;DR - Replicated Ethereum Blockchain. Running Local Node. Connecting Local Node to Web3.js in browser using RPC. Want to create addresses & send transactions
Details -
I have a blockchain that ...
- 33
1
vote
1
answer
2k
views
ERC20 tokens transactions' history from Ethereum node
I have a parity node. I developed a web3.js interface on top of it.
I have APIs whose job is to fetch addresses' balances and transactions.
Example response of transaction API:
{ tx_hash: '...
- 416
0
votes
1
answer
197
views
Using web3js apis for ethereum transactions
I want to use Web3.js APIs to create an Ethereum transaction from an address (not a smart contract) to another address using sendTransaction method (https://web3js.readthedocs.io/en/1.0/web3-eth.html#...
- 433
6
votes
1
answer
2k
views
How to watch several ethereum addresses for transactions [duplicate]
I am wondering what the best way is to watch several (hundreds or thousands) Ethereum addresses at once for incoming transactions and send out the amount deposited once a transaction is detected. I ...
- 304
1
vote
1
answer
154
views
How to check transactions of an address that spent ether to a contract?
Am not sure if the question was already asked somewhere, I tried searching but couldn't get it.
This is what I have done so far.
Created and deployed Token Contract
Created and deployed CrowdSale ...
- 716
2
votes
1
answer
6k
views
How to Deploy and call a contract? Address needed beforehand?
I want to store a string from a script in node.js to blockchain.
This is the contract.
pragma solidity ^0.4.0;
contract SimpleStorage {
string storedData;
function set(string x) {
...
- 135
5
votes
1
answer
1k
views
From an account's address is it possible to tell whether the account is a contract account or externally owned contract?
I am trying to visualise transactions for Ethereum, currently, I know there are blockchain explorers such as Etherscan.io and Etherchain.org, however I don't want to keep calling their API to get data,...
- 175
9
votes
1
answer
12k
views
What is the 0x I see around Ethereum? For example I see addresses that start with 0x
I see a number of things in Ethereum start with 0x, for example addresses. Other examples are in the Geth console, JSON-RPC, web3.js. What is the 0x and what is its purpose?
eth♦
- 86.5k