36
votes
Accepted
How to unstuck a low-fee transaction with blockchain.info?
this is a generic answer applying to "light" wallets - I don't know much about the blockchain.info-wallet
There are several approaches that may work. I'm not sure which methods are most ...
- 831
20
votes
My BTC was stolen using my Blockchain pairing code
Blockchain.info pairing code allows you to sync wallets. For example, it's for when you have coins on your phone and you want to be able to spend them from your computer. So, they synced their wallet ...
- 10.1k
15
votes
How do I cancel my blockchain transaction (still unconfirmed)?
Cancelling unconfirmed transactions is easy. Just submit a higher fee double-spend transaction. For example: if you sent a 0-fee transaction, it could take a day before it gets mined onto a block. ...
- 447
12
votes
Accepted
Download single and specific block for study purposes
However this is JSON, I imagine I can't use it to verify the nonce.
You can. You can build the block header using the data at the beginning of the JSON object and then hash that. Of course it would ...
- 68.5k
10
votes
Can I find out on which website I got my Litoshi address?
Look at a list of Litecoin web wallets to see if any one them sound familiar to you:
LiteVault - Online Litecoin Wallet; private keys encrypted locally
Hive Web Wallet - Online BTC/LTC wallet; ...
- 201
9
votes
BlockChain.info Investments? Sounds like a scam
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 ...
- 191
9
votes
Generating a Bitcoin Address QR code with current USD price embedded?
You can't include the USD amount, but you certainly can include the btc amount in the QR code. The QR code essentially embeds a text like this:
bitcoin:1ArmoryXcfq7TnCSuZa9fQjRYwJ4bkRKfv?amount=0.005
...
- 7,749
9
votes
Accepted
What does "Unable to decode output address" mean?
If you look at the output script for that output, you can see it looks like this:
RETURN PUSHDATA(32) [some garbage]
This script, beginning with OP_RETURN, is called a null-data output, and is used ...
- 11.8k
8
votes
Shared Coin in BlockChain new wallet?
You cannot. That feature has been was "temporarily" cancelled due to numerous reports of stuck transactions and growing awareness of its privacy limitations:
https://blog.blockchain.com/2014/03/17/...
- 311
8
votes
Accepted
If the nonce is 32 bits why the proof of it is difficult?
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 ...
- 23k
7
votes
Transaction with Multiple Inputs having Same Address
Inputs do not refer to addresses, but rather unspent transaction outputs (UTXOs). If there are multiple UTXOs payable to the same address, then a transaction spending those UTXOs will have to list ...
- 8,822
7
votes
What does "Unable to decode output address" mean?
Click "Show scripts and coinbase" to see what that output really is. In this case it's RETURN PUSHDATA(32)[8013...]
RETURN (or OP_RETURN) causes the output to be unspendable. The PUSHDATA then is ...
- 23k
7
votes
Why was giving someone else my 12 word backup a bad idea?
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 ...
- 18k
6
votes
How block explorer technology works?
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 ...
- 1,997
6
votes
Longest unconfirmed transaction?
A transaction could go unconfirmed indefinitely.
The order in which transactions are confirmed is decided by miners, and generally they will be incentivized to include only the highest fee-rate ...
- 18k
5
votes
Is there a blockchain.info for testnet?
Blockcypher supports testnet3 and has their own testnet.
- 1,062
5
votes
Can a clever hacker still steal everyone's money from the blockchain.info wallet?
They anticipated this type of attack and they are monitoring their JavaScript files, check this website of theirs http://blockchain-status.com/javascript_verifier
Also, CloudFlare (the reverse proxy ...
- 51
5
votes
Accepted
Transaction with Multiple Inputs having Same Address
The UTXO that are being used as inputs are tuples of (txid, vout), where the former refers to the transaction the UTXO originated from, and the latter gives the position in the output list.
The ...
- 72.6k
5
votes
Download single and specific block for study purposes
Download a block is easy! Here is a link to an online explorer with a specific block, for your experimental purposes I suggest storing the block in its raw hex format (or binary).
Blocks don't have a ...
- 671
5
votes
Accepted
Blockchain Address gap limit solution
Blockchian.info is not really qualified to provide Bitcoin API's for business, 20 empty addresses are really cool and enough as a personal wallet but for business, it's not.
I suggest you find an ...
- 3,649
5
votes
How do you know that your private key has been stolen?
If your private key was stolen, then the thief can provide you with definitive proof that he possesses the key---for example, by spending your funds.
But unless you have such proof, all you can do is ...
- 11.8k
5
votes
How can i look into the Blockchain
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 ...
- 3,324
5
votes
Accepted
How Bitcoin nodes validate a new wallet
How Bitcoin nodes validate a new wallet
They don't
Bitcoin nodes validate blocks and they validate the transactions within those blocks
Other nodes don't have access to your wallet and can't validate ...
- 25.2k
5
votes
Accepted
What is the request limit number in the blockchain.info API?
Should be 1 request every 10 seconds:
https://www.blockchain.com/api/q
- 181
5
votes
"Needed Turnover" / "Missing Turnover" - How to get my money out?
What you describe is absolutely typical of what happens when someone inexperienced or relatively new to Bitcoin gets tricked by criminal confidence tricksters.
The victim is often contacted by someone ...
- 25.2k
4
votes
What are the equations to convert between bits and difficulty?
There are 3 representations of the same thing (with varying degrees of precision) in Bitcoin:
bits - unsigned int 32-bit
target - unsigned int 256-bit
difficulty - double-precision float (64-bit)
...
- 1,713
4
votes
Accepted
Can a clever hacker still steal everyone's money from the blockchain.info wallet?
Yes, the attack you describe is possible.
But this isn't specific to blockchain.info nor to online wallets.
If an attacker manages to run code on your machine, you're pwned.
As long as an attacker ...
- 803
4
votes
Transaction with Multiple Inputs having Same Address
In the transaction you just listed 1LS1h8UJFgAFqRsw8WqjszBdJWDQg3hj6d is both an input and a change address.
Most of the transaction funds were sent to 187SRqCeXctTbfaqErNqUN5kDzv2PjHVeQ and the ...
- 345
4
votes
Accepted
Does the mempool size equal roughly the unconfirmed transactions?
Every node owner can set their own policy for the mempool. The mempool is limited two-fold:
With -maxmempool=<n> you can set an explicit limit of MB that it will not exceed. The default is ...
- 72.6k
4
votes
fetching unconfirmed utxos from blockchain.info
This is most likely something on blockchain.info's end. You have a very similar call available via API to blockcypher.com here:
https://dev.blockcypher.com/#address-endpoint
unspentOnly=true will ...
- 7,749
Only top scored, non community-wiki answers of a minimum length are eligible