Categories
Cryptocurrency Ethereum Mastering Development

“invalid Txn hash has been entered”, “undefined” error from etherscan

Attempted an eth swap transaction on uniswap Ledger X thru Metamask about 3hrs ago – it’s still pending in Metamask. Etherscan give the following error: "Oops! An invalid Txn hash has been entered", "undefined". In Metamask, status indicates "signature request", "queued". I tried cancelling a couple of times in Metamask, but it gives a "network […]

Categories
Cryptocurrency Ethereum Mastering Development

Need Some Basic Information related Ethereum

I’m newbie to block chaining and need help related truffle and related tools…. Q. Whats difference between truffle and ganache? Q1. Is truffle/Ganache(Don’t know difference) is server side EVM, I mean if I’m developing android Dapp then do I connect to it? Like if you are creating web app then it is easy as I […]

Categories
Bitcoin Cryptocurrency Mastering Development

how does longest chain propagation take place in bitcoin?

Let’s say the valid blockchain that Node A has is:B1->B2->B3 Now, I am gonna cheat since I have lots of computing power. What I do is I download the above blockchain that Node A has and start cheating. Before I do that, I make a transaction to buy a motorbike. so, valid blockchain now looks […]

Categories
Bitcoin Cryptocurrency Mastering Development

merkle root – why thin node needs to know if a transaction is present in specific block’s merkle tree

I understand what merkle root is and how merkle proof works. It’s all about thin nodes to check whether a specific transaction ID is in the specific block. So, thin node says: I have a transaction ID – 12345 and I want to know if this transaction is present in 259,291th block. Why would a […]

Categories
Bitcoin Cryptocurrency Mastering Development

List of different unknown mining pools

A miner can identify himself when he receive his coinbase transaction, we can view them on website offering block explorer like https://www.blockchain.com/charts/pools Some of these miners are listed as Unknown because blockchain.com has been unable to identify them A large portion of Unknown blocks does not mean an attack on the network, it simply means […]

Categories
Bitcoin Cryptocurrency Mastering Development

What does it mean when bitcoin withdrawal is “in transit” or “under review” three weeks time

Could You kindly explain me please what does it mean when bitcoin withdrawal status is “intransit“ status as app shows and second bitcoin withdrawal is “under review” status on the website and this status last 22 days of time now please thank You

Categories
Bitcoin Cryptocurrency Mastering Development

Implementing Psbt in bcoin.io

I am trying to implement Psbt in in a Bitcoin project. The idea is to generate Keys and sign transacciones client-side. I am already familiar with bitcoinjs-lib but i find the api rather complicated. It would be great if I could do that with bcoin.io which is usually more clear and straight forward. I checked […]

Categories
Bitcoin Cryptocurrency Mastering Development

Clarifications on hd multisig wallet

I need clarification on multisig hd wallets. Let’s imagine we have a 2/3 multisig. The first key is generated by the user on a mobile wallet, the second is kept on a server while the third is off-line (for emergencies). In an hd wallet the seed is generated from the seed phrase and, from this, […]

Categories
Bitcoin Cryptocurrency Mastering Development

What is the relationship between bitmain-freq, Hashrate and Power Consumption?

I am running a few old miners (T9+) to heat my home and they are too loud and making a loss (which is ok, as I am interested in the heat). Following this suggestions (sticking with the standard firmware) I already reduced the fan-speed by adding the following entries to /conf/bmminer.conf "bitmain-fan-ctrl": true, "bitmain-fan-pwm": "66", […]

Categories
Bitcoin Cryptocurrency Mastering Development

What is the relationship between bitmain-freq, Hashrate and Power Consumption?

I am running a few old miners (T9+) to heat my home and they are too loud and making a loss (which is ok, as I am interested in the heat). Following this suggestions (sticking with the standard firmware) I already reduced the fan-speed by adding the following entries to /conf/bmminer.conf "bitmain-fan-ctrl": true, "bitmain-fan-pwm": "66", […]