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3
votes
0answers
134 views

How to use an accessor for imbricated data types?

I'm looking at information about accessors in solidity/js for more complex data structures than just a public array/mapping. How can i access the array in that code for: struct AnotherStruct {....} ...
10
votes
1answer
1k views

Geth Gas price too low for acceptance

Why is geth not letting me post a transaction with a low gasPrice? > ./geth console > eth.sendTransaction({ "from": "...", "to": "...", "gas": "30000", "gasPrice": "10", "value": "0.1" }) Gas ...
14
votes
3answers
3k views

How to parse blocks with Python?

I'm building a basic analytics framework for the Ethereum blockchain. As a first step I need to extract the data and I'd like to do this in Python. I've been using Geth as a client on OSX and so, as ...
4
votes
2answers
1k views

Transaction monitoring for deposits?

How do I monitor deposits for the account on ethereum? I saw some APIs that do this and I have tried to do the same on js web3 with filter but without any luck. What I would need is to get all the ...
5
votes
1answer
365 views

Is it possible to run a client behind an onion address?

It is possible to run a bitcoin client which only connects to onion nodes in the TOR network, like that: ./bitcoind -onion=127.0.0.1:9050 -onlynet=tor -externalip=ssapp53tmftyjmjb.onion Is something ...
15
votes
4answers
23k views

What is PoWhash?

When I mine, I get something that says: miner 22:09:05|main Mining on PoWhash #45feeecf… : 6761650 H/s = 3407872 hashes / 0.504 s What does PoWhash mean? I'm assuming that the #45feeecf… is a ...
1
vote
1answer
998 views

MIST wallet balance not showing

I set up a wallet via Linux Terminal in November, I know there is a balance there and just checked. I set up MIST 2 nights ago and was told that MIST recognizes the wallet in computer (which I didn't ...
3
votes
1answer
438 views

Geth console output “short write”

I'm running geth with geth --rpc --rpccorsdomain "localhost" and ethminer 1.1.4 in a separate terminal, and I've noticed that in the geth console I'm getting a lot of messages that simply just say "...
3
votes
1answer
148 views

is the code for the ETH contract available?

As the initial ETH coins were minted and not mined, the contract which was used must exist somewhere. It would be very interesting to study this contract in order to verify how new ETH can be minted....
4
votes
3answers
950 views

Mist does not start anymore? Error: connect ECONNREFUSED

Most recently, I get the following error after executing mist: CONNECT to IPC PATH: /home/santi/.ethereum/geth.ipc CONNECT to IPC PATH: /home/santi/.ethereum/geth.ipc NODECONNECTOR ERROR { [Error: ...
13
votes
2answers
5k views

Is it impossible to use an array of strings as the argument to solidity function?

If I try to define a function using an array of strings as an argument, solc gives me the following error: Error: Internal type is not allowed for public or external functions. function test(...
1
vote
1answer
676 views

What's the header hash displayed in the miner?

Is the "hash" value reported by geth: eth.getBlock("849245").hash, for example, the same "hash" that is given to the miner in the work package? Sorry if this is a naive query. The reason for the ...
3
votes
1answer
1k views

What's the difference between eth and cpp-ethereum?

In Ubuntu, what's the difference between apt-get install eth vs. apt-get install cpp-ethereum? They both seem to install the same packages but seemingly not the same versions.
5
votes
1answer
265 views

How can I verify that the network sees my node?

I've set up an Ethereum node on a spare Raspberry Pi 2 with a 64GB memory card. I used the excellent instructions found on github. The blockchain has synced. I have a few questions: How can I verify ...
4
votes
1answer
464 views

Why does a multisignature wallet in mist only require one signature?

I've created one new contract wallet from an account in mist and this account is supposed to required two signatures. When I test it to send some coins, it asks me to enter one password from one ...
8
votes
2answers
2k views

Will Ethereum be the Internet 2.0?

I've been following Ethereum since it was announced and I remember that the appeal was that it was "Bitcoin 2.0". While email replaced the post and Bitcoin replaced fiat, Ethereum would replace legal ...
8
votes
3answers
1k views

What is the Global Registrar?

Some guy on reddit found an address with 235 ETH in his wallet. He was confused about how he managed to get so much ETH. Commentators told him that it is the global registrar object. Here is an ...
4
votes
2answers
291 views

What's an “indirect ICAP address”?

The ethereum wiki has a specification of basic, direct and indirect ICAP addresses. Where the basic and the direct are well explained here and here, I have trouble to understand how indirect ICAP ...
20
votes
1answer
721 views

Out of Gas invoking precompiled contracts on private blockchains

Why do precompiled contracts lead to Out of Gas on private blockchains? Some tidbits are provided in the Solidity docs but can it be explained more? It might be that you run into Out-of-Gas for ...
3
votes
1answer
195 views

How strong are the checksums in Ethereum addresses?

2 options for Ethereum addresses which have checksums are ICAP and EIP55. Are there others? For each option, how strong are the checksums? What is the chance that a typing mistake (or mistakes) ...
2
votes
1answer
217 views

What is a “basic ICAP address”?

This answer mentions a "basic ICAP address". What is a basic ICAP address and what are its benefits and disadvantages over "regular" ICAP addresses?
7
votes
1answer
202 views

How to get started after participating in the presale?

I participated in the Ethereum presale and have my wallet stored safely in my password manager. Then I stepped away from all things ethereum for a couple years. Now I'm ready to get back into it. I ...
8
votes
1answer
5k views

Basic example of interaction between 2 contracts?

What is a basic example of one contract invoking a method in another (non-calling) contract? Would the address of the contract having that method always need to be hardcoded?
3
votes
2answers
262 views

How to invoke a contract function in the future (under 10 blocks)

This is not a duplicate question, as the alarm contract only allows function calls to be made in the future, over a period of at least 10+ blocks... The current thinking is to just use the alarm ...
2
votes
1answer
1k views

How can configure EthereumJ to connect to the public testnet.?

I need to connect to the public testnet via ethereumj can anybody help me please.
12
votes
4answers
11k views

How can I get the data of the latest 10 blocks via web3.js?

How can I get latest 10 block data by using web3.js like most block explorer does?
9
votes
2answers
53k views

How do I check my mining hashrate?

I've wrangled an old altcoin mining machine into an ethereum mining rig, it has two Radeon 280X cards in it. I'm running geth, with two instances of ethminer, one per card. However the output of ...
6
votes
2answers
964 views

Why does an empty message still invoke the code of the contract?

An empty message still invokes the code of the contract and is the mechanism that allows Solidity to implement a feature of a fallback function per contract. But when msg.data is empty, why does ...
4
votes
1answer
1k views

Member “call” not found or not visible after argument-dependent lookup

Here's the contract: contract Martyr{ function Martyr(){ var address0 = 0x093ff7d4edbd201f1762297e31afcde50bdf4c81; address0.call(bytes4(0x2808241a),...
8
votes
3answers
4k views

Mist: “No data is deployed on the contract address!”

I'm testing a contract on testnet using Mist. When I deploy it, it says "No data is deployed on the contract address!". And then it doesn't appear on the contracts section. What does it mean?
2
votes
1answer
1k views

Can't open the wallet (Windows 10, 64 bit)

Only thing I have is an image saying Starting Ethereum node... If I quit and start it again it says: Couldn't start an Ethereum node! Are you already running a node Windows 10 64bit
10
votes
1answer
577 views

Bad jump array solidity and data location

I'm having a strange issues with an array inside a struct. I will copy you the example code, so that you can understand: Foo[] public foos; struct Foo { uint fooX; uint[] fooArray; } ...
22
votes
3answers
39k views

What does “intrinsic gas too low” mean?

I'm running the Mist wallet, and I've deployed this contract to testnet (from https://ethereum.stackexchange.com/a/179/520) : contract Notary{ struct Document { uint timestamp; ...
2
votes
3answers
481 views

Is it safe to keep Ether on an exchanges during the Homestead switchover?

There are several exchanges like Kraken, Gatecoin, etc. Is it safe to keep Ether on one of these exchanges when the switchover from Pioneer to Homestead takes place?
2
votes
3answers
228 views

Is it possible to chain mulitiple individual transactions into a single “all or nothing” transaction?

Lets say I have a contract with a bunch of individual properties. For example, a person with a firstName and lastName field. A user of a dapp wants to change both fields, which would take two ...
4
votes
2answers
51 views

What's the Purpose of the Vertical Rule Dividing the Work-Space in Browser-Solidity?

And can it be eliminated? I find it distracting.
3
votes
1answer
484 views

Node.js, Geth & Events

I've been tracking a case where my Node.Js server just stop receiving events, basically for each contract, when I do a contact.allEvents({ fromBlock: startblock }, (error, data) => { ... }); It ...
20
votes
7answers
15k views

geth import vs copying chaindata

I'm trying to sync my RPi 2 with the blockchain. geth import runs quite slowly, as well as syncing from scratch. What would be the problem in just copying the .ethereum/chaindata folder from ...
3
votes
1answer
394 views

Can STRATO be utilized as an Ethereum client?

Consensys announced yesterday that BlockApps STRATO is available for Microsoft Azure. Joseph Lubin says, It is also a better Ethereum public mainnet node for various kinds of decentralized apps ...
6
votes
1answer
2k views

How can I connect geth by IPC on rails?

I'd like to connect geth by IPC on rails. I start geth as follows. $build/bin/geth --datadir "/home/vagrant/.ethereum" --networkid "1" --ipcapi "admin,db,eth,debug,miner,net,shh,txpool,personal,web3" ...
11
votes
1answer
3k views

Can I run Geth without syncing?

I want to test some api calls using web3.js and so I am using geth as HttpProvider. Can I start geth without the syncing? Is something like geth --nosync --rpc available?
6
votes
1answer
1k views

How to replicate Bitcoin's OP_RETURN functionality on Ethereum?

I know Ethereum is more advanced, and allows for more interesting things than associating data to a transaction. But let's say I have a legacy system that uses Bitcoin's OP_RETURN. What options do I ...
3
votes
0answers
91 views

Which is the safest way to generate a random number? [duplicate]

I need a function that generates a random number from 0 to n for the lottery. I found 2 ways to do that: 1. https://gist.github.com/alexvandesande/259b4ffb581493ec0a1c But miners can influence the ...
1
vote
1answer
214 views

Is there a loadscript equivalent in eth?

I got this error in eth client : Error: Uncaught ReferenceError: loadscript is not defined is there a loadscript equivalent command in the cpp client eth?
2
votes
1answer
393 views

ETH vs Tokens price issue [duplicate]

Is there any possibility for one token (e.g. Augur's REP) to become more valuable than the total Ether market cap? If so, how would that be possible? In Security of PoS if/when Assets (Tracked or ...
7
votes
2answers
17k views

How can I install go-ethereum on CentOS?

I'd like to setup go-ethereum on centos6.5. However,this reference doesn't show how to install go-ethereum on centos. I tried [vagrant@vagrant-centos65 ~]$ bash <(curl -L https://install-geth....
8
votes
2answers
19k views

What are some good mining pools? [closed]

I'd like to try a bit of mining, but my GPU is way too weak to mine on my own. I've tried finding reviews on existing mining pools for ether but they're very sparse. Could you recommend a pool?
4
votes
1answer
531 views

Does Eth have an equivalent to Geth's --fast flag?

In a previous question, I asked how Geth's --fast flag worked. I'm now moving over to using Eth, so my question is: is there an equivalent option to allow Eth to quickly sync the block data? If so, ...
2
votes
0answers
22 views

Block data duplication when moving from Geth to Eth (or vice versa) [duplicate]

I've so far been using Geth (the Go client) as my client of choice. I'm now interested in using the Mix IDE, a requirement of which is that I use Eth (the C++ client) instead. I've already synced the ...
44
votes
6answers
39k views

How to delete an element at a certain index in an array?

Anyone know how to delete an element in a array? Is there any built in method to do that? If not, does anyone know of how to implement such a method?

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