9

Obviously, he is a scammer trying hard to look similar as the Blockchain's Official Investment scheme but there isn't anything like this ever before. Many scammers are there, one of the most luring advert is 'Earn through Bitcoin Mining from Antminer(S9)'. In the name of Antminer(S9) many persons reaching out through various social platforms to you and ...


6

The vast majority of the time, none of the 2^32 possible nonces in a particular block header template will result in the header having a hash that meets the proof-of-work target. In fact, the probability that this doesn't happen equals exactly 1 over the network difficulty. Right now, that is 1/6,379,265,451,411. When no nonce succeeds, one must change ...


5

All of the transaction history is communicated between peers over a binary gossip protocol. You can request specific blocks, sequences of blocks, or specific transactions, and clients will normally communicate by broadcasting all of the information they receive to other peers they are connected to - enabling each client to stay mostly up-to-date once they've ...


5

someone on blockchain support ask me to tell him my back up fund 12 word in order to reverse my bitcoin which was unconfirmed in my transaction Sorry to say, you were definitely scammed. You cannot reverse a bitcoin transaction in that way, the scammer only told you that so that you would give them the 12 word phrase. With that phrase, the scammer could ...


3

It is difficult to cancel a Bitcoin transaction after it's been sent, and it cannot be done by the recipient, only by the sender. If the transaction has been confirmed, cancellation becomes impossible. However, the funds are not lost. They will be waiting in the address until you claim them. You can either eventually finish installing and syncing Bitcoin ...


3

Most of the issues you're encountering are limited to the proprietary processes used by the blockchain app you are using, and only their support will be able to navigate you through them. Concepts such as face ID, wallet ID, etc. are not standardized by the bitcoin implementations, and vary from provider to provider. If you're lucky, when Face ID is ...


3

Blockchain.com is not a blockchain node, it is an explorer. They have no constraint on following the same rules as a Bitcoin Core node, and can keep orphaned and forked blocks available if they wish to, and return all blocks they know of for a block height if they wish to. In the main Bitcoin chain, things are as you say - Only a single block may survive at ...


2

Exactly! Just reset your wallet and then import your private key. It'll work like magic.


2

The blkxxxx.dat files contain the blocks in the order that they were downloaded from peers. Since the client requests blocks from many different peers in parallel, and different peers may respond at different speeds, it is quite possible for blocks to be downloaded out of order. (Headers are downloaded first, as a separate step, so the client knows what ...


2

i need to know that what will I be charged by the network. The network doesn't charge you, you decide what to pay the miners, and the miners determine if your transaction fee is high enough to include in the next block or not (since they get the transaction fees). It doesn't look like Blockchain.info has an API for estimating the fee (it is an estimate, ...


2

The information you are looking at is incorrect and seems to be the result of interpolation of the graph, there was no difficulty changes that resemble that in the Bitcoin block chain. Difficulty changes are every 2016 blocks, which is approximately 2 weeks if there is no difficulty change within the period.


2

This doesn't sound correct to me. You're relying on a centralized service to fetch blocks. What if their system has an error and sends you incorrect data? What if their service is unreachable? It doesn't seem like you have any way to handle blockchain reorganization. You might end up crediting a payment twice, or crediting where a double spend was ...


2

In the bitcoin blockchain, the difficulty of mining is adjusted after every 2016 blocks. If the average mining time for the last 2016 blocks was higher than 10 minutes than the difficulty is reduced so that the time readjusts to 10 minutes. While if the time to mine the last 2016 blocks was lower than 10 minutes, then the difficulty is increased. Although ...


2

Your transaction size calculation is incorrect. The inputs are 1 byte input count + 36 byte output + 1 byte scriptSig + 4 byte sequence + 1 byte witness stack count + 1 byte signature length + 71 byte signature + 1 byte pubkey length + 33 byte pubkey = 149 bytes for all of the input data. That along with 32 bytes for output, and 10 bytes for the rest of the ...


2

In addition to Chytrik's mention of a dust attack, dust limit transactions are also used heavily by the Omni Layer to identify the recipient of an omni asset. Transactions such as those will follow pattern of one dust (or near dust) output, an OP_RETURN output, and a change output. While dust attacks tend to create thousands of dust outputs in a handful of ...


2

This output value corresponds to the dust limit that is imposed on bitcoin transactions. Many of these outputs may have been generated as a dust attack to de-anonymize users/ addresses.


2

Blockchain.info (and other block explorers) do additional processing of the transaction data in order to make it more user friendly to follow the path of coin movement through multiple transactions. Additionally, it seems that whatever you are using to print out the transaction details is not showing you all of the information. In a transaction, each input ...


1

No, they would not. In Bitcoin, wallet is an abstract concept as it is just a software that manages your private keys and addresses. The addresses generated from the private key in your wallet bear no resemblance to others. Unless you explicitly mention it to them that it is your address, there is no way of knowing whether it is you who has sent the bitcoins ...


1

If you lack free space enable disk space restrictions via settings menu > options > main tab. You will still need to download the blockchain but it'll automatically delete blocks that it has verified to lower disk space usage. The lowest you can set the amount there is 550 megabytes. However if you do that it'll use about 3.5GB so that's the minimum amount ...


1

To request an individual block from a p2p peer, consider the get_data message, indicating what type of block (witness/compact/filtered). Since you do not wish to do full block download and validation, you can first build a header chain to the most recent height, and then verify the block you are requesting is in the header chain. This would ensure that it ...


1

Blockchain.info does appear to support testnet blocks and transactions by simply using the "testnet" subdomain. For example: txid: 4200cea53a075f3081156a9d664fe05cfe108a09e26e8f20ee65e7ebe141060b block: 1443900 address: mum6KQEwAHGDRr7HRXx7hufcsyqiGPUCtN So in your case simply use this: https://testnet.blockchain.info/tx/#{txid} https://testnet....


1

What if my transaction is not picked by the miners and what is the criteria for miners to pick? How can I rely on blockchain to settle/do fund transfer if it is not getting picked? You are at the mercy of miners to pick your transaction if you do not try to mine it yourself (which currently would require a substantial investment). Typically, miners will ...


1

To my knowledge, there is no high quality data source for this. Blocks mined is fairly simple to check, as that is simply the main chain's progress. Stale blocks is harder for Bitcoin and Bitcoin based currencies. Unlikely ethereum's uncles, references to stale blocks are not stored anywhere, and after a better chain exists, propagation will not take place,...


1

Sites like bitnodes run their own lite nodes which are crawlers. These nodes connect to other nodes and only receive data from those nodes. When a node receives a new block, it will send it to the nodes it is connected to. If one of these is a bitnodes crawler, it can record that it received a block at height X from the node. In this way it can track the ...


1

Bitcoin fees aren't set as a percentage of the amount being transferred, but based on the number of bytes needed to encode the transaction. In principle you can set any fee that you want, but miners will choose the higher-fee transactions to confirm, and others may never be confirmed. It can be a little tricky to get your money back in that case, depending ...


1

target your transaction on this site. Also review this


1

Not without help of a BCH miner. Basically there is no way to claim these coins under Bitcoin Cash since they unpicked all the SegWit changes prior to forking. These coins are actually seen as "anyone can spend" coins on the BCH network (unlike in Bitcoin, someone claiming these is breaking no rules so the transaction would be accepted as valid), so a ...


1

tx_hash and tx_hash_big_endian are the little endian and big endian representations of the transactions hash. Bitcoin uses little endian hashes internally, but explorers normally show such information in big endian, you can read more about such topic here. Regarding tx_index, that field is an internal id for blockchain.info database. It has nothing to do ...


1

Transactions do not have an individual timestamp. The closest you can do is get the timestamp from the block that it was included in (but note Pieter's warning about accuracy). API Example Using blockchain.info, for example you can do: https://blockchain.info/rawtx/$tx_hash For $tx_hash = b6f6991d03df0e2e04dafffcd6bc418aac66049e2cd74b80f14ac86db1e3f0da ...


1

The Bitcoin system doesn't have a "sender's address". You can walk the transaction history to find out what destination the coins you were paid was last sent to but that is not a "sender's address". Imagine if you had a magic wand you could wave over any package you received in the mail that would tell you where it was last mailed before you. You wave the ...


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