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4
votes
0answers
66 views

Possible to sign offline transactions with Geth? [duplicate]

I'd like to set up a cold storage wallet that has the ability to create and sign transactions offline. It seems both Icebox and ethkey has this functionality, but I'd prefer to have the option to ...
4
votes
1answer
227 views

Alethzero QOpenGLWidget issue

I have downloaded and built the latest alethzero client. I have Qt5.5 installed. Running on Ubuntu 14.04 qt.network.ssl: QSslSocket: cannot resolve SSLv2_client_method qt.network.ssl: QSslSocket: ...
5
votes
1answer
1k views

In solidity, how can I hardcode bytes > 32 bytes

I want to create a contract with a hardcoded bytes variable. contract Test(){ function Test(){ bytes x = 0x..... //greater than 32 bytes } } The above returns a Type int_const not ...
6
votes
2answers
264 views

Do I need to prepare anything for the upcoming homestead release?

This is a canonical question. What actions should regular users miners and pool operators developers undertake to prepare for the upcoming homestead release which includes a forking mechanism.
13
votes
2answers
4k views

Ethereum event log maximum size

I'm thinking of storing some data in logs by emitting events but I cannot easily find the answers to the following questions: What is the total size limit of one event? Can I store lots of string32 ...
8
votes
1answer
195 views

Registrar in a private testnet

I've created a test network --networkid="11111" and I was able to create the "greeter" contract as an excercise. Now, I'm following this guide and I am trying to register a name, but with no luck: ...
6
votes
2answers
2k views

Why did the DAG file change in block 1080000?

I'm mining to dwarfpool, and all of sudden am getting this message on the account: "DAG file changed in block 1080000" Does this mean that my DAG is out of sync and if yes, how do I resync it, tried ...
4
votes
2answers
2k views

Contract deployment throws block gas limit error

I'm trying to deploy a smart contract in a test network, using a [meteor DApp][1]. I have this parameters for the genesis block: gasLimit: "0x1388" However, any time I try to deploy any single ...
3
votes
1answer
140 views

What is pendingtotal and nicependingtotal in cpp-ethereum?

If I enter > web3.admin.eth.allAccounts() in my eth client I get the following answer after it lists my accounts: }, nicependingtotal: '21.173 ether', nicetotal: '16.168 ether', ...
2
votes
4answers
351 views

How to find out the ethereum addresses of services like Digix, Augur, etc.?

Is there any way to easily find the Ethereum addresses of Digix, Augur and similar Ethereum based enities? Or do I have to manually contact them?
3
votes
5answers
2k views

Can I monitor contract's activity on any explorer?

Is there any way I can use a blockchain explorer or similar tool to find out how much activity there is on addresses for specific ethereum based services (Digix, Augur etc. pp.)?
8
votes
1answer
672 views

Are linkable ring signatures available in Ethereum?

Are transactions with ring signatures available in Ethereum? There should be as anonymity/fungibility is important. Also, I think Vitalk Buterin mentioned it may be possible to implement an EVM ...
3
votes
1answer
500 views

Will the processing power of the EVM ever be increased?

From what I understand almost all hash power on the network is used to secure the blockchain, but the processing power of the EVM remains constant even as the hash power of the network increases, and ...
15
votes
3answers
5k views

Mining with geth on private network hangs indefinitely

I've got a private test network running as per this article. In particular my difficulty is set to 0x400; the entire genesis file I'm using can be seen here. Mining with geth does not seem to work ...
8
votes
1answer
385 views

Cheapest way to store a hash for proof of publication

Can someone help me how to use events/logs for proof of publication? The way I understand it, I send a transaction with the metadata I want "proof of publication" for, to a contract. The contract does ...
4
votes
1answer
178 views

Is having an open TCP port dangerous (Mac OSX)?

I was reading this post on reddit where a user got all her ether hacked because she had an open RCP port when deploying a contract. I just used network utility to run a scan and it turns out I have ...
2
votes
2answers
665 views

Can't enter any commands after starting eth on Windows

I'm running the eth client (0.9.41) on Windows 10 using the following command: eth --frontier -b -i as stated here. The program hangs and I'm not able to enter any commands. The last produced ...
6
votes
1answer
700 views

Should I use the default gas price?

I see that there is a default gas price, but does everyone use it? Do people get away with paying much less for gas? Are there any websites that track how long transactions take at different gas ...
1
vote
0answers
37 views

How to fix Mist node sync problems? [duplicate]

I am having problems syncing Mist. I have tried versions 0.3.9 and 0.4.0. I have been syncing for 4 days and I'm still stuck at 750.000 blocks of 1.000.000 blocks. I'm using Windows 10 64bit. Any ...
1
vote
1answer
742 views

method not available: solc (solidity compiler) not found

I am using ethereum-ruby to deploy smart contracts. I am using JSON RPC calls to my geth and its working pretty well. But when i use compile_solidity I get: "error"=>{"code"=>-32603, "message"=&...
4
votes
2answers
415 views

Is it possible to mine slowly?

I'm developing a DAPP in a laptop. I setup a private test blockchain with one node to develop locally and do not have to spend real ethers. It works fine, but when I start mining, the laptop gets ...
3
votes
0answers
144 views

What are all the usages of ether? [duplicate]

I know that gas is used to keep contracts running but what are other usages for ether? Is ether used for buying all kinds of virtual tokens, will you need ether to use dapps or how is ether going to ...
2
votes
0answers
388 views

How to initialize private blockchain using flu?

I get the following error when trying to initialize a private bockchain using flu: $ sudo flu console --config ~/ppaconfig.json flu Hinted genesis block's state root hash is incorrect! flu Hinted #...
3
votes
1answer
519 views

Does a contract message call require a signature from the sender?

Say for example you have this simple contract: contract Example { function sayHello() constant returns (string msg) { return "hello"; } And I make a message call: exampleContract.sayHello....
3
votes
0answers
132 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
2k 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
898 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
322 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
983 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
372 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
141 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
922 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
4k 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
655 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
248 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
455 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
271 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 ...
19
votes
1answer
679 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
172 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
206 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
191 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
4k 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
250 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
8k 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?

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