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Questions tagged [blockchain.info]

This tag should be used for questions regarding the service 'blockchain.info'. Blockchain Ltd. is a company that offers a web wallet and provides a blockchain explorer under the domain blockchain.info.

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32
votes
10answers
116k views

How to unstuck a low-fee transaction with blockchain.info?

I've sent a transaction from blockchain.info, but accidentally included too little fee. What can I do to cancel the transaction or speed up the transaction's confirmation? This is a complementary ...
-1
votes
1answer
861 views

Recovering the private key from a blockchain wallet address

One of my friends used my wallet to import a funded blockchain wallet to my wallet id. First this wallet is watch-only and I can't spend the bitcoins inside this wallet because I need the private key. ...
13
votes
4answers
464 views

Scenario: disaster splits the Internet into dozens unconnected fragments

Major US cities restore connectivity locally for a couple of days, but the internet islands are separated (or have very poor interconnectivity). Two days later, connectivity is restored resulting in, ...
7
votes
4answers
25k views

Get BCH from blockchain.info after fork

I had a fraction of BTC on blockchain.info before the 1st of August and I didn't touch them at all afterwards. I never got my private keys (nor the 12 words) from my blockchain.info wallet (or if I ...
8
votes
1answer
1k views

What method does My Wallet use to encode messages in the blockchain?

What kind of protocol does My Wallet use?
19
votes
1answer
5k views

How does blockchain.info calculate the “Estimated Transaction Value?”

Consider the following transaction: https://blockchain.info/tx/aa5eb27652bd85dc444ea2508bf0ff6ff1b484141e2d7e69f31976fafb21e06e Each of the output addresses has never before been used, and there is ...
7
votes
2answers
5k views

How to solve Blockchain 20 address gap-limit problem?

We currently offer Bitcoin withdrawals and deposits on our website. Blockchain API is used to handle all operations. Only problem is Blockchain Receive API's 20 address gap limit, as mentioned here: ...
23
votes
11answers
15k views

Is there a blockchain.info for testnet?

I'm trying to test to see if transactions went through or not and blockchain.info is super helpful for this on the real network.
10
votes
5answers
11k views

How to restore locally a MyWallet backup?

The website blockchain.info has an online wallet system MyWallet which creates backups with a .aes.json extension. While I understand it's a json file encrypted with AES using my passphrase, I'm still ...
7
votes
1answer
7k views

In case of the Bitcoin split - when holding BTC on blockchain.info - will I receive coins on both forks?

Everyone says: If you do not hold private key to your BTC, you do not own BTC. Technically speaking I do not hold the private key, but I do have the 12 words backup phrase. I would like to know ...
15
votes
3answers
18k views

What is the fastest possible way to download the blockchain?

How to download the blockchain with full bandwidth? How to download the blockchain fast?
6
votes
1answer
2k views

How block explorer technology works?

If you click on random wallet at block explorer you get an instant info of all the transactions, balance etc etc. My question is, how their technology works exactly? Do they transform blk????.dat ...
4
votes
2answers
2k views

How does blockchain.info associate a message with an address? [duplicate]

I randomly encountered this address on blockchain.info: https://blockchain.info/address/1CzpppydnGN5dQN7iBnZbmm5RXreu7hrHW and at the top a message appears presumably describing the owner of the ...
2
votes
2answers
640 views

Accepting Bitcoin payments without the full blockchain or third party APIs?

I want to make a basic program/script that utilizes Bitcoin payments, but I don't have the storage space to sync with the entire blockchain, and I don't want to be dependent on a third-party API like ...
1
vote
2answers
1k views

Accidentally sent to my own receiving address, will I get back my bitcoins?

I mistakenly pasted my own Blockchain.info receiving address into the recipient field when I was trying to send BTC to a friend. I usually receive either a "send" or "receive" notification in my ...
0
votes
4answers
8k views

How to get the list of transactions of input/outputs for a bitcoin address in JSON format?

Is there an example of how to get all the transaction data for a bitcoin address in json format?
6
votes
1answer
193 views

Does blockchain.info backup wallet include also the next addresses

The standard client's wallet includes a key pool of 100 extra pre-generated addresses, which are the next ones to be "generated" when you ask an extra address. Does the blockchain.info's backup ...
0
votes
1answer
4k views

Is it possible to identify a wallet from an address?

I want to know is there anyway to identify a particular wallet (its username or email address) on the basis of a Bitcoin receiving address which is generated from that wallet. I am posting that ...
0
votes
1answer
661 views

Where do I obtain private keys?

Just received my profits from a "watch only" address, where do I obtain private keys?
-1
votes
1answer
239 views

I NEED YOUR HELP URGENTLY Bitcoins

I really need your help on this. It has stated in my wallet that i've received my bitcoins of 1.182691BTC on 29/05/18. This's my wallet address: muFjdWSy2DKStSP2gUH2aHZq6kRBva8ZDV it stated on the ...
10
votes
3answers
7k views

What are the equations to convert between bits and difficulty?

If we take block hash 0000000000000006770c3806960539ca83a24facbd99ea212f37f2a0e6a5629a for example. The difficulty as a 32 bit float is 50810339.04827648. The difficulty in bits as an unsigned 32 bit ...
7
votes
4answers
7k views

What does “Unable to decode output address” mean?

On BlockChain.info, I have noticed a few transactions which send money to "Unable to decode output address". For example, here is one: https://blockchain.info/tx/...
9
votes
3answers
2k views

Can an unconfirmed transaction that only Blockchain.info shows be manually re-broadcast?

Blockchain.info shows a transaction that was created by Blockchain.info/wallet but for whatever reason the transaction didn't confirm right away and appears to not be getting re-broadcast (perhaps ...
2
votes
1answer
385 views

Sites for searching the blockchain?

This is a general question, but what's the best way to search the blockchain? Blockchain.info lets you search by address, but it seems to be a side feature instead of its central purpose. Are there ...
4
votes
2answers
2k views

Why does blockchain.info show a different balance from bitcoin-qt?

I just created a wallet on blockchain.info by importing my wallet.dat from Bitcoin-QT. My Bitcoin-QT shows a balance of 3.991 BTC, while blockchain.info shows a balance of 3.016. Where does the ...
3
votes
1answer
432 views

Does the mempool size equal roughly the unconfirmed transactions?

My bitcoind (v0.13.0) mempool size is currently 12k transactions as can be seen from: tail -f ~/.bitcoin/debug.log I find this number very surprising as I naively expected it to keep in line with ...
2
votes
1answer
480 views

Why was Blockchain.info DecryptWallet removed?

https://blockchain.info/DecryptWallet.html has been removed for quite some time. Anyone know why? PS. FWIW, an archived copy at Pastebin
0
votes
1answer
431 views

How to move blockchain.info api created wallet to be used by bitcoin core

I originally created my wallet through the blockchain.info api. I have since downloaded the bitcoin core and it's finishing downloading all the blocks now. What is the process to access this wallet ...
8
votes
1answer
9k views

Extract private keys from Bitcoin Wallet

I have encrypted my bitcoin wallet. I know the passphrase, that's not the issue. I want to transfer my bitcoins to blockchain.info but it's asking me for the private key. I cannot find it nor can I ...
5
votes
2answers
3k views

How can I use multisig / split keys using My Wallet?

I was sure that My Wallet supported multisig, but I can't seem to find it now. How can three users of My Wallet create an address that is only spendable if at least two of them cooperate? Or is this ...
4
votes
4answers
4k views

Download single and specific block for study purposes

I just started studying bitcoin. I would like to be able to download a single block from the Bitcoin network. This should be an old block, already mined, and which I can know the nonce. Then I ...
3
votes
2answers
2k views

Why is the transaction fee a multiple of the amount I want to send?

I tried sending 0.0001 BTC from my blockchain.info wallet. It deducted 0.0009 BTC from my account, including a 0.0008 BTC is transaction fee. Is it correct that the transaction fee is 8 times larger ...
3
votes
1answer
114 views

What actions trigger the need to obtain a new backup with Blockchain.info/wallet?

Other clients, including Bitcoin-Qt, use a key pool so that a backup is still valid for a while. Blockchain.info/wallet doesn't use a key pool. After a backup of the wallet is obtained and archived, ...
3
votes
1answer
1k views

Callback not working in program using the blockchain api

I am trying to create automated receive Bitcoin payments via Blockchain API. I have my API key, xpub, everything. I'm using PHP. Here is the part of my code for generating wallet address: $scrt = ...
3
votes
1answer
229 views

Get blockchain info for exchange transaction

I'm sorry in advanced if this questions are dumb but here goes ... Does all buy/sell bitcoin related transactions made in exchanges get logged in the blockchain? if so can they be found and/or ...
3
votes
0answers
14k views

Any way to delete unconfirmed transaction? [duplicate]

Recently I sent some bitcoins without adding a fee and now, it's been taking too long. Is there any way I can recover my bitcoins? I want to delete my unconfirmed transactions from Blockchain.info? I ...
2
votes
1answer
755 views

How does one submit a transaction to the network using the blockchain.info API?

I am currently working on a project which makes use of the blockchain.info api (php). Could anybody please tell me how to use this api to submit transactions to the network?
2
votes
2answers
468 views

What options do I have to avoid API gap limit? I am using xpub keys

I am building a app, and the design is, the "welcome page" has a qr code allowing the user to purchase a single-use of the app. Blockchain.info conveniently allows you to use xpub to generate ...
2
votes
1answer
5k views

How do I import to MultiBit from Blockchain.info?

I have a single password and a yubikey on my account at blockchain.info. When I try to import the wallet.aes.json file nothing happens. When I select the import file, MultiBit never displays the '...
2
votes
1answer
572 views

ELI5: How do I import keys from blockchain.info backup into MultiBit 0.5.18

So, blockchain.info is holding my account hostage. My phone with my 2FA was lost (and remotely wiped) and they refuse to remove the 2FA on my account to get access. I have a recent backup of my keys ...
1
vote
2answers
2k views

Unable to get private key for Blockchain wallet

I am new to BTC and I have a question: How to get private key from Blockchain wallet for a "Watch only" address? I have been trying for days with no positive results. Thanks.
1
vote
0answers
230 views

When computing a normalized transaction id, when do I finalize the sha256 hash?

I'm trying to compute the normalized transaction ID so that it matches what is on blockchain.into at the following URL http://blockchain.info/q/hashtontxid/ --- normal TX ID here ---- Given that I ...
1
vote
0answers
266 views

Get fees for each transaction in a block without too many API calls

Using Blockchain.info's API, my current approach is to query the endpoint for a block then to collect all the transaction hashes within that block: https://blockchain.info/rawblock/$block_hash Then ...
1
vote
1answer
2k views

Calculation of transaction fee for transaction

I like to calculate the transaction fee which takes place for making the transaction to blockchain platform. How can i calculate it?? I had gone through google and got to know that it's based on the ...
1
vote
0answers
98 views

Is there a comparison between different blockchain.info's wallets?

Blockchain.info has different ways to access their wallet, and I'd like to read a comparison of these different apps, especially concerning their security. I am mostly interested in a comparison ...
1
vote
2answers
257 views

Do all block explorers show all unconfirmed transactions?

If I want to show someone that I just made a transaction without showing them my wallet, could I expect that it would be recorded on a block explorer immediately?
1
vote
0answers
544 views

Does blockchain.info's json-rpc api return invalid json?

example response for getting a block: {"id":"0","result":{"tx":[1ddd2f103625405389705637ab69603de692a22e86f06428a2... there should be a " after the "tx":[
1
vote
1answer
1k views

Validation Error: Error #-26: 258: txn-mempool-conflict

I am getting this error message. What does it mean? Validation Error: Error #-26: 258: txn-mempool-conflict
1
vote
1answer
153 views

bc.info transactions with no timestamp

The last transaction in blocks 219882, 219888, and 219892 don't have a timestamp. And by last transaction I mean the last transaction shown in the json file. 219882 219888 219892 I find this to be ...
0
votes
0answers
519 views

How to transfer bitcoins from blockchain.info?

I want to transfer bitcoins from blockchain but I don't know how. I have a bither and I want to transfer it there. How to transfer bitcoins from blockchain.info to bither?