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alper
  • Member for 7 years, 8 months
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65 votes
2 answers
78k views

How can I figure out if a certain key exists in a mapping, Struct defined inside Library (in Solidity)?

52 votes
7 answers
75k views

How to convert a string to bytes32?

35 votes
2 answers
27k views

What is the difference between `now` and `block.timestamp`?

34 votes
7 answers
16k views

How to store IPFS hash using bytes32?

19 votes
4 answers
22k views

Is it possible to check string variable's length inside the contract?

18 votes
4 answers
8k views

How can I call a constant function without spending any gas inside a transaction function?

16 votes
2 answers
5k views

What is the safest minimum block time to use without having any problem on Proof-of-Authority consensus?

16 votes
4 answers
29k views

unable to connect Ethereum node even RPC port: 8545 is open

12 votes
2 answers
8k views

Adding private network peers to Parity

11 votes
1 answer
3k views

Does "delete" on mapping really frees the memory space?

11 votes
3 answers
32k views

Could mapping data structure return the number of items it points?

11 votes
2 answers
4k views

How to connect etherwallet to my private blockchain?

10 votes
1 answer
12k views

Inside a smart contract, is it possible to get latest mined block's number and its hash?

10 votes
2 answers
31k views

How to do Ethash CPU mine using ethminer?

9 votes
4 answers
4k views

How do I buy Ethereum with USD - If I am citizen of not available in country in coin-base?

9 votes
3 answers
4k views

JavaScript console on Parity: unable to unlock account. Error: Method not found

9 votes
1 answer
1k views

Geth 6.2: miner.start() returns null and miner's hash-rate drop for all miners down due to the update

9 votes
1 answer
4k views

Is it possible to call debug_traceTransaction from nodejs?

9 votes
3 answers
6k views

How could "ethereum block explorer" connect into geth that is already running on the main server securely?

9 votes
2 answers
2k views

Why gas usage differ on mapping(int32 => Struct) vs Struct[]?

9 votes
2 answers
1k views

What is the safest way to use WS-RPC server in geth?

9 votes
4 answers
21k views

How do I decode the transaction's log with Web3.py?

8 votes
2 answers
2k views

How to immediately include transactions into blocks if there is still space?

8 votes
4 answers
2k views

web3.js getBlock() call pauses after 500th iteration on MacOs

8 votes
2 answers
865 views

What are differences between Ethereum and EOS?

7 votes
3 answers
870 views

Is it possible to check that does client's node's block number matches with the blockchain's best(latest) block number?

7 votes
2 answers
925 views

Is mapping via msg.sender as secure as calling a function only by the owner?

7 votes
2 answers
2k views

Is there any limitation for the number of the return values from Solidity functions?

7 votes
1 answer
2k views

How to call Library Function from a Contract? => [error] The contract code couldn't be stored, please check your gas amount. undefined

7 votes
1 answer
3k views

How can I deploy a contract with reference to a library contract without using a graphical user interface like Browser Solidity?

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