ethereum tag

14 questions

1 answers
107 views
0

How to Switch Networks in MetaMask

I want MetaMask to switch to the Rinkby Test Network, but it doesn't show up as a network option.I'm sorry for the rudimentary question, but I'd like you to tell me how to switch.I have already tried ...

ethereum

1 years ago

1 answers
78 views
0

I want to move the Solidity ERC20 token from one third party to another, but I get an error.

Me: AERC20 tokens:CoinERC20 tokens:FundDeployer for both tokens is the same account: Zcounterpart:BI want to move the same amount of Coin from Z to B when A burns the FundIf you send thank you from A ...

ethereum solidity

1 years ago

1 answers
94 views
0

Is any blockchain P2P communication protocol acceptable?

I studied blockchain as a hobby, and I got a rough outline, but I don't really understand how to communicate with each other.In various reference books, Use P2P communication~ is written, but even if ...

ethereum

1 years ago

1 answers
86 views
0

How do I compile a two-class solidity in the same file in a py-solc-x using Smartcontract?

Until now, I used Remix or Truffle to deploy SmartContract.I decided to use py-solc-x because I wished I could deploy it on Python.I couldn't solve the problem, so I would like to ask for your help th...

ethereum solidity

1 years ago

1 answers
80 views
0

An error appears stating that the equal member is an invalid type (library Assistant).

If you try to test if the string value is correct, an error occurs. When you do numbers, there are no errors and compiles well. However, the string keeps getting the following error message.Error: Mem...

ethereum truffle

1 years ago

2 answers
116 views
0

How can I return the mapped list when writing Ethereum Contract?

I am working on a very simple smart contract that can save the value and get it back as a list. The code is as below.contract lister { mapping(int => string) list; int id = 0; function getList() re...

ethereum solidity

1 years ago

2 answers
130 views
0

When using Testrpc, the error appears that tx has an invalid nonce value.

I am studying truffles recently and am working on the following documentary: http://truffleframework.com/tutorials/pet-shopWhenever I try to cause a transaction, the error below appears.Error: Error: ...

node.js ethereum truffle metamask

1 years ago

1 answers
90 views
0

I have a question about Ethereum truffle error.

geth —testnet —syncmode fast —rpc —rpcapi db,eth,net,web3,personal —cache=1024 —rpcport 8545 —rpcaddr 127.0.0.1 —rpccorsdomain * Or geth —rinkeby —syncmode fast —rpc —rpcapi db,eth,net,web3,personal —...

ethereum truffle geth

1 years ago

2 answers
100 views
0

I wonder the difference between platforms that use different blockchain protocols.

I know that developers use various blockchains such as Hyperledger, multichain, Ethereum, and Corda with different network protocols.Developers and those who have a lot of knowledge about blockchain w...

blockchain hyperledger ethereum corda

1 years ago

1 answers
84 views
0

Why do I use the "memory" keyword in Ethereum's Solidity?

When you look at the sample smart direct provided by Ethereum, the arrays are sometimes declared memory in the function, and sometimes they are not. What's the difference?Source: https://stackoverflow...

ethereum

1 years ago

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