All Questions
Tagged with transactions contract-invocation
123 questions
5
votes
1
answer
462
views
Proper ethereum exchange workflow
I've recently found out, that there's no convenient way to monitor transactions to 'externally owned account' generated by some contract.
I went to various forums and ethereum bugtrackers for an ...
- 51
3
votes
1
answer
275
views
How can I set the gas price of a transaction initiated by a contract?
I am writing a contract that will interact with another contract: contract A will call a function defined by contract B. Is it possible to set the gas price that contract A is willing to pay when ...
- 63
1
vote
1
answer
113
views
Where is the position of each paramter in a smart contract function when encoded as inputdata in a transaction
When I reviewed the BEC attack, I found the position of each parameters value in real transaction was not corresponding in to definition of function in smart contract.
The exploit transaction is at:
...
- 71
1
vote
1
answer
51
views
How does contract of dapp figure out who buyer is?
How does contract of dapp(eg. market place) figure out who buyer is?
If buyer wants to purchase servive(or product) at certain dapp, he should transfer tokens to contract address of the dapp.
At ...
- 147
1
vote
1
answer
278
views
Bad Jump Destination, how can i tell programmatically?
Let's say i'm programmatically making a transaction to a contract. How can I tell (programmatically) that the confirmed transaction has a Bad Jump Destination? Right now, the only way I know of is ...
- 640
0
votes
2
answers
212
views
how to loop call token transfer function in a single transaction
I find a transaction here which contains multiple inner transfers. It seems that it saves a lot gas. May I do this with web3j?
- 235
0
votes
1
answer
148
views
Need Solidity software for smart contract, for Multiple Token dispatch [duplicate]
Please I need to distribute tokens to at least 1,500 wallets and can't go through the stress of sending them one by one.
What I need is a smart contract to enable multiple dispatches to several ...
1
vote
1
answer
105
views
What happens when transaction is sent from smart contract?
If during smart contract execution it decides to send a transaction, then transaction would be created, validated and broadcasted to the network from all the nodes executing this smart contract. ...
- 11
3
votes
2
answers
156
views
Simplest way to find percentage of transactions that invoke EVM?
Firstly I want to make sure my understanding of the Ethereum is correct:
A "normal" transaction of Ether from one account to another does not usually invoke the Ethereum Virtual Machine?
Secondly:
...
- 331
1
vote
1
answer
179
views
Which scope of variables changes the state of the contract?
I had been reading about the state of a smart contract. Here
It also gives a small example of a contract.
contract SimpleStorage {
uint storedData;
function set(uint x) {
storedData ...
- 547
1
vote
0
answers
74
views
Possibly hacked but not sure Help!
I recently had most ERC20 tokens moved from a MEW wallet through the individual ERC20 contracts. Does anyone know how this may have happened? I am sending pertinent info from one on etherscan.io
1)...
1
vote
1
answer
126
views
How to be notified with bad transactions when sending to a JSON-RPC server?
With Ubuntu, I've tried Wallet/Mist and MetaMask on Ropsten testnet: they both notify me with bad transactions before inputting my password. I've tried to do the same thing with a JSON-RPC server, in ...
- 113
0
votes
1
answer
224
views
Sending parameters via the transaction Object
This works just fine:
myContractObject.doSomething(i, function(err, result) {
if (err) {
console.log(err)
} else {
doSomethingElse(result)
}
})
However, this doesn't:
...
- 614
0
votes
1
answer
171
views
How to form the transactionObject in a metamask enforced async call?
Normally, for a contract call (i.e. something that does not update ethereum), I would simply do: var something = myContractObject.getSomething().
I've just started using metamask, and unfortunately, ...
- 614
1
vote
1
answer
93
views
Is gas ultimately *only* sent to miners while the computation defined in a smart contract is performed by each node of the network? [duplicate]
To my understanding, the execution of the code inside a smart contract is done by all nodes in the network. However the miners are the only ones who receive the paid gas. Also, when setting up the ...
- 11
0
votes
1
answer
148
views
Contract killed twice
Due to a delay (not minutes, but hours probably) in mining first a kill transaction https://testnet.etherscan.io/tx/0xf087a137e7f4962260da26928d205cabd71eed68fd79f8f35fb1027073f03812, and minutes ...
1
vote
1
answer
336
views
Approval + Deposit each time, vs a one time Approval then only Deposits after
I've noticed that some token contracts are requiring me to do an approval before I make a deposit and some do not.
For example. SNT and CVC do not require me to do an approval before I deposit. ...
- 640
0
votes
1
answer
64
views
Is it safe to assume that a smart contract can hold Ether for years if the withdrawal is not triggered?
Given that ethereum continues to run for few years, is it safe to assume that the smart contract will hold the ether that was deposited into it for years until its triggered to transfer/withdraw the ...
- 103
1
vote
0
answers
115
views
Implementing a reinforced invoice?
I have a question. My contract structure involves 2 user at address A and B respectively:
First A trigger the logging method from the contract with B's address as parameter. This will record a ...
- 11
0
votes
0
answers
43
views
How do i get to return value form one smart contract function into another smart contract on private ethereum network?
Here it is my called function.
pragma solidity ^0.4.19;
contract Called{
string public name;
function set(string _var) {
name = _var;
}
function get() view returns (...
- 31
3
votes
1
answer
104
views
Same functionality, new contract for new usage?
When different people use the same contract functionality, do they send to the same contract address? Or do they create their own new copies of the contract at a different address? If they use the ...
- 2,426
3
votes
1
answer
72
views
High level discussion: anomaly monitor
I was reading about past attacks on Ethereum network and I pictured the following hypothetical scenario: there is a tool or automated, machine learning based anomalous monitor to check out constantly ...
- 312
1
vote
0
answers
60
views
Can two state-changing transactions be in a single block? [duplicate]
I don't know how Ethereum verifies the atomicity of the state of a contract in the mining process.
Say I have a greet-counting contract.
If two people call the greet function in (almost) the same ...
- 11