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Cryptocurrency Ethereum Mastering Development

I need help with Ether Cards I received from my brother

I have set up an ether wallet and I have revealed the 12 word private key. Now what? How do I get the funds on the card into my wallet? Where do I input the private key words? I feel like this should be simple but I can’t figure it out. Help!

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Cryptocurrency Ethereum Mastering Development

Gas price and limit with Truffle deployment in Ethereum

I am developing a smart contract in truffle. I’m having some trouble understanding how GAS works in Ethereum. I used the following parameters in my Rinkeby test net: gas limit: 4600000 gas price: 10000000000 (10Gwei) This means that the Gas limit is set at: 4600000 * 10000000000 ~ 0.046 ETH ~ 17 $ On the […]

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Cryptocurrency Ethereum Mastering Development

Gas price and limit with Truffle deployment in Ethereum

I am developing a smart contract in truffle. I’m having some trouble understanding how GAS works in Ethereum. I used the following parameters in my Rinkeby test net: gas limit: 4600000 gas price: 10000000000 (10Gwei) This means that the Gas limit is set at: 4600000 * 10000000000 ~ 0.046 ETH ~ 17 $ On the […]

Categories
Cryptocurrency Ethereum Mastering Development

Messaging platform with public-private key pairs as identifier

Is there any platform available for Ethereum address 0x1d53.. to message 0xcc23…, and so on? It seems like there would be a lot of demand for something like that, which suggests it exists. Off-chain, I guess. I need it for the pairs in Pseudonym Pairs (source code) to agree on a random video channel over […]

Categories
Cryptocurrency Ethereum Mastering Development

Messaging platform with public-private key pairs as identifier

Is there any platform available for Ethereum address 0x1d53.. to message 0xcc23…, and so on? It seems like there would be a lot of demand for something like that, which suggests it exists. Off-chain, I guess. I need it for the pairs in Pseudonym Pairs (source code) to agree on a random video channel over […]

Categories
Cryptocurrency Ethereum Mastering Development

AES in Solidity

I need to encrypt and decrypt AES in Solidity. I know that this results in the ciphertext and the plaintext being publicly readable but I’m not trying to hide anything, just verify that a given ciphertext, plaintext and key match under the AES algorithm. Is there an AES library for solidity? If not: what would […]

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Cryptocurrency Ethereum Mastering Development

Cryptographic limit to total accounts on Ethereum

Factoring in birth day attacks and all that, with 256-bit elliptic curve cryptography, what is the maximum number of accounts that are secure? It isn’t 2^256 since then any time you generate a random number you find a used account. Birth day paradox and all that, what is the upper limit of how many accounts […]

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Cryptocurrency Ethereum Mastering Development

how to get(catch) returned value from function that changes state, in front-end

contract test{ function test1(string memory _name) public returns(address) uint tempData = uint (keccak256(abi.encodePacked(_name,block.timestamp))); address batchNo = address(tempData); return batchNo; } when call this function using .call() it returns value but not getting written blockchain and when i call this function using .send() it get written on blockchain but not returning that value; //how to catch […]

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Cryptocurrency Ethereum Mastering Development

MetaMask – Quorum – Network – Custom RPC – Could not fetch chain ID. Is your RPC URL correct?

Instructions from scratch https://docs.goquorum.consensys.net/en/latest/Tutorials/Creating-A-Network-From-Scratch/ genesis.json Directly from the tutorial: "chainId": 10, startnode1.sh #!/bin/bash PRIVATE_CONFIG=ignore nohup ~/quorum/build/bin/geth –datadir new-node-1 –nodiscover –verbosity 5 –networkid 31337 –raft –raftport 50000 –rpc –rpcaddr 0.0.0.0 –rpcport 22000 –rpcapi admin,db,eth,debug,miner,net,shh,txpool,personal,web3,quorum,raft –emitcheckpoints –port 21000 >> node.log 2>&1 & node.log Snippet: INFO [10-28|07:05:16.741] Initialised chain configuration config="{ChainID: 10 Homestead: 0 DAO: <nil> DAOSupport: false […]

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Cryptocurrency Ethereum Mastering Development

MetaMask – Quorum – Network – Custom RPC – Could not fetch chain ID. Is your RPC URL correct?

Instructions from scratch https://docs.goquorum.consensys.net/en/latest/Tutorials/Creating-A-Network-From-Scratch/ genesis.json Directly from the tutorial: "chainId": 10, startnode1.sh #!/bin/bash PRIVATE_CONFIG=ignore nohup ~/quorum/build/bin/geth –datadir new-node-1 –nodiscover –verbosity 5 –networkid 31337 –raft –raftport 50000 –rpc –rpcaddr 0.0.0.0 –rpcport 22000 –rpcapi admin,db,eth,debug,miner,net,shh,txpool,personal,web3,quorum,raft –emitcheckpoints –port 21000 >> node.log 2>&1 & node.log Snippet: INFO [10-28|07:05:16.741] Initialised chain configuration config="{ChainID: 10 Homestead: 0 DAO: <nil> DAOSupport: false […]