A very simple blockchain explorer. | Bitcointalksearch.org

manu2

newbie

Activity: 3

Merit: 0

Quote from: RobertPaulig on April 28, 2019, 07:57:14 AM

Can someone explain it to me? On this page https://learnmeabitcoin.com/glossary/private-key you say that:

Quote

A private key can be almost any 256-bit number.
When you create a public key, your private key is put through a special mathematical function, and this function can only handle numbers up to just below 256 bits. The maximum value is:

max = 115792089237316195423570985008687907852837564279074904382605163141518161494337
So when you generate a 256 bit number, you will want to check that it's below this maximum value.

But 2^256 is 115792089237316195423570985008687907853269984665640564039457584007913129639936

You can easily verify this
https://www.wolframalpha.com/input/?i=2%5E256

The number of private keys are limited by the secp256k1 Elliptic Curve Cryptography algorithm. It is the "n" value listed here https://en.bitcoin.it/wiki/Secp256k1

If you want to understand better how this work programmatically, you should see this very nice explanatory video: https://www.youtube.com/watch?v=iB3HcPgm_FI

RobertPaulig

newbie

Activity: 7

Merit: 1

Can someone explain it to me? On this page https://learnmeabitcoin.com/glossary/private-key you say that:

Quote

A private key can be almost any 256-bit number.
When you create a public key, your private key is put through a special mathematical function, and this function can only handle numbers up to just below 256 bits. The maximum value is:

max = 115792089237316195423570985008687907852837564279074904382605163141518161494337
So when you generate a 256 bit number, you will want to check that it's below this maximum value.

But 2^256 is 115792089237316195423570985008687907853269984665640564039457584007913129639936

You can easily verify this
https://www.wolframalpha.com/input/?i=2%5E256

Bloody Mary

full member

Activity: 154

Merit: 100

I'm getting "Couldn't connect to bitcoin .. when I click on a block for some reasons ?

tobasco

member

Activity: 61

Merit: 12

Quick Update:

Just a couple of changes that might be helpful:

Blockchain

Blocks in the blockchain show how "full" they are. So for example, if you're browsing through the blockchain you can easily spot the empty blocks:

Transactions

The inputs and outputs of a transaction are sized based on their value. This makes it easier to follow the path of large amounts of bitcoins:

Merry Christmas.

Greg.

tobasco

member

Activity: 61

Merit: 12

Learn Me a Bitcoin: Update:

Been working on improving the blockchain explorer over the last few months.

Goal

My aim is to create a fast, lightweight, and easy-to-use blockchain explorer.

Here are some new features:

Node:

This page has stayed about the same. However, it now displays the time since the last block was mined:

Blockchain:

Visual display of time between blocks that have been mined, along with tooltip to show the time.
Miner is shown next to each block, along with a tooltip of the full coinbase scriptSig.

Block:

Clicking on the Version field takes you to a page that shows you the bits being used for signalling.
Clicking on the Bits field takes you to a page that shows you how the target has been represented in the compact nBits format.

Transaction:

Now shows output values by default. Should have done this a long time ago, but hey ho, it's there now.

Segwit:

Added a bunch of icons to Segwit transactions so that you can spot them when you are browsing through the memory pool or through blocks.

Download:

You can now download entire raw blocks or transactions:

(scroll to bottom)

General:

The site is generally much faster.
The latest transactions are tracked much more quickly. So if you make a transaction, you should be able to find it in this blockchain explorer about 1 second after it has been relayed to my node.

As always, I'm open to ideas for improvements

tobasco

member

Activity: 61

Merit: 12

Quote from: blacknerd on May 22, 2017, 01:58:52 AM

Hi, excellent website which i found useful.

Are you able to categorize the website because it it being blocked at work

I can try!

I'm not sure what I need to do to categorize the website though. Do you know how I would go about doing this?

blacknerd

newbie

Activity: 6

Merit: 0

Hi, excellent website which i found useful.

Are you able to categorize the website because it it being blocked at work

tobasco

member

Activity: 61

Merit: 12

Update: Path Tool

This tool finds connections between bitcoin addresses.

This update makes it much faster. It should now be able to connect any two addresses, no matter how complex.
As a result, it should be effective enough for light forensics on the movement of bitcoins between addresses.

johhnyUA

legendary

Activity: 2436

Merit: 1849

Crypto for the Crypto Throne!

Quote from: tobasco on February 10, 2017, 11:41:49 AM

Quote from: johhnyUA on February 10, 2017, 07:26:04 AM

Hmmm, I will necessarily learn this blockexplorer more attentively. There is many interesting functions in it, i hope everything works fine and correct.

But it will be good to add some more functions like hashrate of the chain (maybe also make options "depend by country" ).

Thanks.

Can you explain more about what you mean by "hashrate of the chain"? I have a page that shows you the difficulty: http://learnmeabitcoin.com/browser/node/difficulty/ - are you looking for something different?

By "depend by country", do you mean something like showing the time based on a country's timezone (and not just GMT)?

Here - https://blockchain.info/ru/charts/hash-rate . It's not a difficulty as you see. It's statistic about how many mining pools (or mining devices) used in bitcoin chain. (can be used for assessment in mining)
Depend by country - depend hashrate by country ) But i think it's very hard to do, maybe impossible.

freemanjackal

sr. member

Activity: 378

Merit: 250

i didnt know that about fees, i assumed this was from the beginning of btc,that's why tx without fees take so long to get confirmations, just when there aren't enough tx is that they are included, good to know, thanks for the explanation, i understood very well

tobasco

member

Activity: 61

Merit: 12

Quote from: johhnyUA on February 10, 2017, 07:26:04 AM

Hmmm, I will necessarily learn this blockexplorer more attentively. There is many interesting functions in it, i hope everything works fine and correct.

But it will be good to add some more functions like hashrate of the chain (maybe also make options "depend by country" ).

Thanks.

Can you explain more about what you mean by "hashrate of the chain"? I have a page that shows you the difficulty: http://learnmeabitcoin.com/browser/node/difficulty/ - are you looking for something different?

By "depend by country", do you mean something like showing the time based on a country's timezone (and not just GMT)?

johhnyUA

legendary

Activity: 2436

Merit: 1849

Crypto for the Crypto Throne!

Hmmm, I will necessarily learn this blockexplorer more attentively. There is many interesting functions in it, i hope everything works fine and correct.

But it will be good to add some more functions like hashrate of the chain (maybe also make options "depend by country" ).

tobasco

member

Activity: 61

Merit: 12

New Tool: Find connections between addresses.

Address Path

This tool will show you if there is a connection between two addresses.

It's very basic at the moment, but I think it could be very useful, so thought I would share it while I work on it.

Example:

Here's a post on Reddit about tracking the movement of Mt Gox stolen coins. I haven't fully read the analysis, but you can use the tool to see that there is a connection between the two addresses mentioned at the top of the post:

1AYtnRppWM7tWQaVLpm7TvcHKrjKxgCRvX and 1KLahQtqDNAXvrjNyfvgSBtAhwco5ZxLp4

tobasco

member

Activity: 61

Merit: 12

Quote from: freemanjackal on February 09, 2017, 05:27:52 PM

you have made great job so far, the site is fast and very functional. i just have a question, a doubt from searching blocks in your site. the first blocks dont collected any fees, when was that this started, to become a common practice. was this always meant to be?

Thank you.

Yes, that is correct, the first blocks did not collect any fees.

This is because fees are used as an incentive for miners to include transactions in to a block. For example, if a miner can only fit 1000 transactions in to a block, and there are 2000 transactions in the memory pool, the miner will select the top 1000 transactions with the highest fees. So if you want to ensure that your transaction gets mined quickly, you should add a juicy fee to it.

However, at the start of bitcoin there were not a lot of transactions, which meant that you didn't have to compete with other transactions for space in a block. Therefore, you could send a transaction with 0 fees, and a miner would probably include it in a block anyway.

Fees started being collected from blocks when there was more competition to get in to a block, and people started adding fees to their transactions.

freemanjackal

sr. member

Activity: 378

Merit: 250

you have made great job so far, the site is fast and very functional. i just have a question, a doubt from searching blocks in your site. the first blocks dont collected any fees, when was that this started, to become a common practice. was this always meant to be?

btc_enigma

hero member

Activity: 692

Merit: 569

Quote

The transactions are selected using the default getblocktemplate command using bitcoin core. As far as I'm aware, fees are generally selected and ordered based on fee per byte. However, when you construct a block, you have to make sure that all transactions are in order... as in, if one transaction uses the outputs of another transaction, then that transaction must come after the one it depends on (in the candidate block). That's why the transactions are not strictly in highest-to-lowest fee-per-byte order, although that is the general trend.

Thanks, make sense. Will be following the project updates.

tobasco

member

Activity: 61

Merit: 12

Quote from: theymos on January 24, 2017, 01:11:35 AM

Quote from: tobasco on January 23, 2017, 08:14:29 PM

Candidate Block - This is actually trying to be mined on to the blockchain. It refreshes every 20 seconds to include the transactions with the highest fees. (The lowest fee-per-byte transactions tend to be at the bottom of the block, so by hovering over the bottom one, you can work out the minimum fee-per-byte needed to be included in the next block in the blockchain.)

Is this using Bitcoin Core's block creation code?

Yes, it uses getblocktemplate to select the transactions.

tobasco

member

Activity: 61

Merit: 12

Quote from: btc_enigma on January 24, 2017, 12:52:46 AM

Also please check the price. Your site is showing $1233.21. Too good to be true Grin

Haha, yeah, thanks. Added to my fix list.

I'm using the localbitcoins.com price API, but it can be wildly inaccurate on some currencies for some reason. Going to try bitcoinaverage instead.

tobasco

member

Activity: 61

Merit: 12

Quote from: btc_enigma on January 24, 2017, 12:50:21 AM

This is really awesome work. I really like the candidate block and memory pool

Quote

Candidate Block - This is actually trying to be mined on to the blockchain. It refreshes every 20 seconds to include the transactions with the highest fees. (The lowest fee-per-byte transactions tend to be at the bottom of the block, so by hovering over the bottom one, you can work out the minimum fee-per-byte needed to be included in the next block in the blockchain.)

Are the tx actually sorted by fee per bytes ? I see some of the transactions out of order. It would be good if you can display the fee per byte on the right (instead of the tooltip). Also please change unit of fee per byte to satoshis instead of BTC, its easier to read

I have also shared this on reddit to get more community feedback

Thank you very much

.

The transactions are selected using the default getblocktemplate command using bitcoin core. As far as I'm aware, transactions are generally selected and ordered based on fee per byte. However, when you construct a block, you have to make sure that all transactions are in order... as in, if one transaction uses the outputs of another transaction, then that transaction must come after the one it depends on (in the candidate block). That's why the transactions are not strictly in highest-to-lowest fee-per-byte order, although that is the general trend.

I like the idea of showing the fee per byte on the right instead of in the tooltip, as that is relevant and a core part of how the candidate block works. Thank you.

Also, thanks for helping me to share the site.

theymos

administrator

Activity: 5222

Merit: 13032

Quote from: tobasco on January 23, 2017, 08:14:29 PM

Candidate Block - This is actually trying to be mined on to the blockchain. It refreshes every 20 seconds to include the transactions with the highest fees. (The lowest fee-per-byte transactions tend to be at the bottom of the block, so by hovering over the bottom one, you can work out the minimum fee-per-byte needed to be included in the next block in the blockchain.)

Is this using Bitcoin Core's block creation code?

Topic: A very simple blockchain explorer. (Read 20205 times)