blk.dat files contain blocks data in raw format. Also a leveldb index is maintained that helps to quickly lookup blocks/utxo. You can find the details here and here.
Blockexplorers will not directly read these files. It is not safe for multiple process to access leveldb at the same time (blockexplorer and bitcoin node process). Here is a brief summary of ...
Given the tags you're setting on your question, I believe you're confusing currencies, wallets, and explorers.
Bitcoin (BTC) and Bitcoin Cash (BCH) are currencies with an associated blockchain.
Wallet/node software is what you use to interact with that currency.
Software that interacts with BTC includes Bitcoin Core, Bitcoin Knots, btcd, Electrum, ...
esplora is just the web ui frontend, you also need to setup the (forked) electrs backend for indexing and for providing the HTTP API that esplora queries.
electrs can index the bitcoin block chain using two methods: by reading the blk files directly out of disk, or by querying for blocks using the bitcoind rpc. The first method is significantly faster, but ...
Feerates on the Bitcoin network are expressed in sats/vbyte (where vbyte is bytes, but taking the segregated witness discount into account). blockchain.com shows sats/byte (where byte refers to the actual number of bytes used to serialize the transaction); this metric is meaningless for fee estimation purposes.
blockchain.com doesn't show sats/vbyte directly,...
Short answer: Yes, this is probably a bug in the block explorer. blockexplorer.com shows a positive balance.
Some of the transactions shown there are "strange" (they presumably have non-standard scripts which someone was experimenting with), and this probably is tripping up the biteasy explorer.
Note that the notion of "balance" of an address only really ...
You need to differentiate between the website's wallet (Blockchain.info-wallet) and the blockchain itself.
You are allowed (by the bitcoin protocol) to make as many transactions per adress as you want.
But wallets try to make it as comfortable as possible for you and use one adress only one time so that you are acting as pseudonymously as possible.
API providers, such as Blockchain.com, are not querying a node to answer your queries to them usually. For the handful of providers that actually do offer a proxy service to a bitcoin node, they usually run several of them and spread out incoming queries so that no single node is answering a huge number.
They extract the information they need and store it ...
BIP47 transactions look like any other transactions as far as inputs/outputs & fees are concerned. There is no difference.
Payments are not sent to the payment code itself but rather to addresses generated by the shared secret of both the sender's payment code and the receiver's payment code.
The only recognisable trace on the blockchain is the ...
This transaction is a Pay-to-pubkey transaction, so there is no OP_DUP and no OP_HASH160. When validating an input, you first need to find the scriptPubKey of the output that this input spends from. The first input of your transaction spends from the first output of https://blockchain.info/tx/ff3dc8b461305acc5900d31602f2dafebfc406e5b050b14a352294f0965e0bf6. ...
The actual script implemented on Lightning Network is a little bit different from what you quoted. This is the script below and the specification is here
# Penalty transaction
I've created that transaction on ...
Is the blocks and chainstate folder store the same blocks data ?
No, the blocks directory contains the actual blocks. The chainstate directory contains the state as of the latest block (in simplified terms, it stores every spendable coin, who owns it, and how much it's worth).
How can we read those data using code and display that on the web frontend ...
Blockchain Explorer says received but it's not received yet!
That's not how Bitcoin works.
All computer-based wallets, including your friend's, have a copy of the blockchain (or have indirect access to a copy). If the blockchain includes your transaction, then the money has been received. All copies of the blockchain are eventually identical, only the last ...
@Prince M's answer is great, I have just a couple things to add:
Wallet software will generally only show you transactions relevant to the wallet, so if you ever want to explore transactions beyond your own, you might want to use a block explorer to do so.
If you are running a full node, then you can look up transactions using bitcoin-cli, but a full node ...
There is no guarantee that a transaction propagates through the network at all.
Blockexplorers can only show transactions that they see. They're often configured in a way that will make them be more likely to see transactions, however.
The latter address does not show up in google because it has not been used for a transaction yet. Once someone sends money to it, it will show up.
It's possible that we'll be able to create systems in the future that don't have this problem, but don't hold your breath.
Are you looking for 'bare multisig' transactions by BIP-11?
Have a look here: https://webbtc.com/stats and here: https://webbtc.com/scripts/multisig
Or may be you are interested in BIP-16 mostly used for multisig?
Take this link: http://p2sh.info
Because it's possible to only partially sign a transaction (for example only one input) and then give that unfinished transaction to another party, who can then finish the transaction with their signature (for another input). Parties do not need to reveal their private keys to each other at all.
Only after all parties signed can the transaction be sent to ...
Their definitions of 'total received' differ in that blockchain.info does not count change outputs as an amount 'received', whereas most other explorers do (since there is no way in general to determine if an output is really change or not, unless change is sent back to the sending address, which is the case for blockchain.info wallets).
See this related ...
I found an INCREDIBLY detailed spreadsheet documenting every single "weird" Tx up until March 2014. It's available at John Ratcliff's Code Suppository in his "Transaction Input Signatures in the Bitcoin Blockchain over time" blog post, which in itself, is an incredibly comprehensive source of technically based Bitcoin information.
Spreadsheet documenting "...
Yeah, that's how they work. For example, blockexplorer.com gets blocks from Bitcoin Core via JSON-RPC, gathers interesting chunks of data, and puts this data into a SQL database for easy access later. The code for this is only ~300 lines long (though it's very messy). Other block explorers work similarly. In fact, Bitcoin Core itself works something like ...
There is no need to buy any data, and if someone is offering to sell you block headers, then you are being scammed.
The Bitcoin network protocol supports transmitting just block headers. So you can just use or create a software which can speak the Bitcoin network protocol and download just the block headers. The getheaders message is what you need in order ...
Blockchain.info has an interesting pie-chart showing the origin of blocks. On that page, they specifically note:
A large portion of Unknown blocks does not mean an attack on the network, it simply means we have been unable to determine the origin.
Blocks do not need to contain any identifying factors. The miner can choose to provide a script in the ...