User Achala Dissanayake

139 votes

1 answer

52k views

What is Swarm and what is it used for?

eth♦

78.3k

asked Jan 22, 2016 at 10:36

80 votes

9 answers

85k views

How can I check if an Ethereum address is valid?

ether addresses checksum public-key

ZMitton

2,495

asked Feb 15, 2016 at 2:20

60 votes

7 answers

15k views

How can I verify that a contract on the blockchain matches the source code?

solidity security contract-deployment compilation

J-B

8,201

asked Jan 21, 2016 at 7:10

52 votes

3 answers

37k views

What is an Event?

solidity contract-development blockchain events block-header

atomh33ls

7,884

asked Jan 8, 2017 at 17:23

49 votes

4 answers

25k views

What is the zero, empty or null value of a struct?

solidity contract-development struct

Thomas Clowes

4,145

asked Feb 2, 2016 at 17:35

41 votes

3 answers

20k views

How to write an optimized (gas-cost) smart contract?

solidity contract-development contract-design contract-deployment gas

Ay.

1,947

asked Oct 19, 2017 at 15:03

33 votes

3 answers

14k views

Ethereum Merkle Tree Explanation

state-trie merkle-patricia-tries

Susmit

1,744

asked Apr 18, 2017 at 12:18

27 votes

3 answers

10k views

Are there any public/free nodes to connect a Dapp front end?

dapps nodes

eterps

714

asked Jan 24, 2016 at 0:10

25 votes

1 answer

21k views

What is the receive keyword in solidity?

solidity fallback-function solidity-0.6.x keyword receive

Shane Fontaine

14.6k

asked Mar 29, 2020 at 23:38

19 votes

2 answers

27k views

how to estimate gas cost?

contract-design gas gas-price gas-limit gas-estimate

dome some

319

asked Sep 29, 2017 at 15:23

18 votes

4 answers

31k views

How to properly create a raw transaction and sign it using web3 in browser

web3js private-key raw-transaction signature

S1r_Mar71n

327

asked Jan 15, 2018 at 17:10

17 votes

1 answer

12k views

Member function "transfer" not found or not visible after argument-dependent lookup in contract?

solidity truffle ganache payments

Robert Oschler

771

asked Nov 26, 2018 at 19:49

16 votes

5 answers

9k views

Using web3 to sign a transaction without connecting to geth

transactions web3js raw-transaction

Max

171

asked Jun 21, 2016 at 3:19

14 votes

3 answers

5k views

Accepting an ERC20 Token as Payment

solidity contract-development tokens erc-20

rudar_man

153

asked Aug 2, 2017 at 20:01

12 votes

2 answers

7k views

Solidity functions - private visibility

solidity security privacy

Alex Darby

901

asked Jun 26, 2016 at 17:46

10 votes

3 answers

953 views

Best Resource for Intense Solidity Coding (In May 2018)

solidity

pgSystemTester

219

asked May 28, 2018 at 1:33

10 votes

4 answers

25k views

How to transfer ERC20 tokens using web3js

web3js tokens erc-20

user16150

101

asked Jul 27, 2017 at 0:45

6 votes

2 answers

2k views

How do I serialize an array of strings in Solidity?

solidity contract-development contract-design contract-debugging

jaybee

195

asked Oct 24, 2016 at 0:14

6 votes

1 answer

583 views

what is the difference between non-executable transactions and executable transactions?

go-ethereum transactions

maroodb

951

asked Nov 14, 2019 at 9:26

6 votes

3 answers

7k views

Default value of a struct

solidity contract-development mapping struct

Nicola Squartini

175

asked Jan 17, 2017 at 10:46

6 votes

1 answer

642 views

How can I use the mathematical constant e in Solidity?

solidity

user6391810

63

asked Mar 17, 2020 at 9:01

5 votes

2 answers

1k views

Is there any project to calculate different hashes like md5, sha1 etc. in solidity?

hash-algorithm

pubkey

1,077

asked Jun 12, 2017 at 11:05

5 votes

1 answer

6k views

How can I verify ownership to allow resale of NFTs?

ether etherscan nft

Eswar Rajesh Pinapala

151

asked Apr 2, 2021 at 22:13

4 votes

4 answers

875 views

Choosing between Javascript and Solidity for testing smart contracts

solidity truffle testing mocha

Bastien

356

asked Nov 12, 2018 at 14:23

4 votes

1 answer

897 views

How to call two functions in atomic transaction from web3 node client

solidity web3js

Dan H

43

asked Oct 4, 2017 at 23:43

4 votes

1 answer

225 views

How does this contract scam work?

solidity scam

Kurt

43

asked Aug 17, 2020 at 11:49

3 votes

1 answer

4k views

Solidity multiple vs single require

solidity contract-development testing require

frollo

145

asked Nov 9, 2017 at 15:18

3 votes

2 answers

873 views

Truffle in production it´s recommended [closed]

truffle

UnexpectedCharacter

732

asked Nov 27, 2018 at 9:35

3 votes

1 answer

227 views

Ethereum Merkle Patricia Tree Riddle

merkle-patricia-tries

Jay573

31

asked Dec 14, 2018 at 10:50

3 votes

1 answer

2k views

Understanding Solidity libraries

solidity

diabetesjones

501

asked Jul 17, 2017 at 4:52

Stack Exchange Network

current community

your communities

more stack exchange communities

47 Bookmarks

What is Swarm and what is it used for?

How can I check if an Ethereum address is valid?

How can I verify that a contract on the blockchain matches the source code?

What is an Event?

What is the zero, empty or null value of a struct?

How to write an optimized (gas-cost) smart contract?

Ethereum Merkle Tree Explanation

Are there any public/free nodes to connect a Dapp front end?

What is the receive keyword in solidity?

how to estimate gas cost?

How to properly create a raw transaction and sign it using web3 in browser

Member function "transfer" not found or not visible after argument-dependent lookup in contract?

Using web3 to sign a transaction without connecting to geth

Accepting an ERC20 Token as Payment

Solidity functions - private visibility

Best Resource for Intense Solidity Coding (In May 2018)

How to transfer ERC20 tokens using web3js

How do I serialize an array of strings in Solidity?

what is the difference between non-executable transactions and executable transactions?

Default value of a struct

How can I use the mathematical constant e in Solidity?

Is there any project to calculate different hashes like md5, sha1 etc. in solidity?

How can I verify ownership to allow resale of NFTs?

Choosing between Javascript and Solidity for testing smart contracts

How to call two functions in atomic transaction from web3 node client

How does this contract scam work?

Solidity multiple vs single require

Truffle in production it´s recommended [closed]

Ethereum Merkle Patricia Tree Riddle

Understanding Solidity libraries