monsterBTC

Free bitcoin faucet

MonsterBTC is a completely free bitcoin faucet. Fee for that or not is taken. At each visit you can receive a different number of satoshis. The amount of bonus from 900 to 5000 satoshi!

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Guaranteed payments every Monday. Withdrawal from 500000 satoshi. Admission during the day. The minimum amount is going to very quickly and easily. Funds to FaucetBox

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Beginner's Wallet Technical FAQ

Wallet Technical FAQ

Are wallets deterministic?

No. Addresses are generated from a large random number generated by your browser. Therefore, private keys are non-deterministic. This means you do not have to backup or remember an additional seed. However, if you lose your encryption password there is no way recover your keys.

Does the client generate a pool of addresses?

As of yet, no. Initially wallets only contain a single address, but you may generate more. “Change” from transactions is returned to the sending address by default, but can be sent to a different, or new, address in your wallet.

What does "Watch Only" mean?

Bitcoin addresses come in two parts - a public key and a private key. The public key can be used to view an address’s balance and transactions, but it cannot be used to make transactions without the private key. The private key is the important part which proves ownership of an account and allows Bitcoins to be spent.

When addresses are labeled with “no private key”, it means the private key is not contained in your My Wallet data. You must have a backup of this key elsewhere (e.g. paper wallet) in order to make transactions.

Where is my wallet stored?

We use MySQL Cluster to store your wallet data. Upon creation your wallet is synchronously saved on at least 2 separate privately owner servers. Our servers are collocated in a locked cabinet at a datacenter with a dedicated security guard. Every 24 hours a database backup is saved to an off site location.

You can access your wallet.aes.json file either from an email notification every time there is a change in your account, or through the 'Import / Export' tab when logged into your wallet. Then, you can take that wallet.aes.json and import the backup with this page.

What fees do you charge?

The service is free of charge. An additional network fee maybe required for some smaller transactions which goes to the bitcoin miners.

What if an attacker knows my wallet identifier?

If you do not have two factor authentication enabled, the attacker can gain access to your encrypted wallet data. The attacker can then attempt to decrypt your wallet by brute force.

An attacker cannot delete or update your wallet without also having the shared key. The shared key is contained within the wallet but can only be accessed after the wallet has been decrypted.

What if an attacker knows my wallet identifier and shared key?

The attacker can remove your wallet from our online backup. Unless he also has the full plaintext wallet data, your private keys are still safe.

What information do you store about my wallet

• Wallet identifier
• Shared Key
• Time the wallet was created
• Time the wallet was updated
• Time the wallet was last accessed
• Encrypted JSON wallet data
• Wallet alias - Optional short link if set by the user
• Notifications email - Optional if you want to receive transaction notifications by email

What information do you store about my transactions

We log no transaction information which is not available publicly on the Site. Transactions data is accessed using our publicly available API and we are unable to determine the difference been transactions that have been submitted publicly or those that have been created in our online wallet. No API calls include your wallet identifier or any other information linking that transaction to your wallet.

Online transactions are created and pushed to our API in binary form, exactly how it will appear when it is relayed through the bitcoin network.

What information do you include in API calls

The following is a list of the API calls the client will make and any attached data.

Method	Purpose	When	Attached data
/multiaddr	Get summary data about the provided bitcoin addresses	Called when the wallet is opened	Hash 160 of each address
/unpsent	Get any upsent TxOuts from the provided bitcoin addresses	Called before a transaction is made	Hash 160 of each address

If javascript can be used to sign transactions why does it need to use your sever at all?

At the time of writing the bitcoin block chain is around 750MB in size. We index this data on our servers so that you do need to download or sync it every time you open your wallet. Also, it is not possible to open native sockets from within a browser so the javascript client cannot communicate directly with other bitcoin nodes, for this reason the transaction is relayed through our servers.

How can I trust the javascript I am running is not malicious?

You can never totally trust javascript which is downloaded from another server as the provider is able to modify the code freely with no easy way to detect or differentiate between malicious or necessary changes.

We provide a Chrome app for blockchain.info My Wallet, which is available in the Chrome app store. Using this will significantly decrease your risk of falling victim to a phishing site or modified javascript.

We make all efforts to be as transparant as possible. All the javascript files are available on our github repository at https://github.com/blockchain/My-Wallet you can view the commit messages to see changes we have made.

What programming language is the site written in.

The site is written in Java using ClusterJ and JDBC to interact with the database. We use a patched version of the mainline bitcoin client to relay transactions and update our database with blockchain data. All SQL queries are written using prepared statements.

Please describe the wallet decryption and transaction creation routine.

Server	Client
	Client Requests encrypted wallet data for an identifier
Sever responds with encrypted payload
	Client uses password to decrypt the wallet in browser
	Client request transaction data from our API
	Client creates and signs transaction in the browser
	Client pushes raw transaction data to http://blockchain.info/pushtx
Server relays transaction to bitcoin network

Please describe the wallet creation routine.

Server	Client
	Client generates wallet identifier and private key
	Client generates JSON data containing private key
	Client encrypts JSON payload
	Client requests encrypted payload is stored on server with a provided identifier
Server Stores encrypted data

Please describe the wallet update routine.

Server	Client
	Client Requests encrypted wallet data for an identifier
Sever responds with encrypted payload
	Client decrypts wallet and shared key
	Client modifies wallet data and rencrypts JSON output
	Client request wallet is updated providing both the identifier and shared key
Server Stores encrypted data

What is double spending?

A double spending is where a user inadvertently or maliciously tries to spend his Bitcoins twice. It may be a result of multiple devices using the same Bitcoin wallets, as well as from unconfirmed transactions that never get approved because they have no transaction fees and the user eventually tries to spend his Bitcoin again.

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Beginner's Blockchain Wallet FAQ

Blockchain Wallet FAQ

What is a block explorer?

A block explorer is a service that allows you to easily view and verify information about the blocks, addresses, and transactions created by Bitcoin. It simplifies transactions by saving Bitcoin users the hassle of running the Bitcoin client to verify the exchanges. Blockchain.info is a block explorer.

What is a block? 

A block is a record of some or all of the most recent Bitcoin transactions that have not yet been recorded in any prior blocks. An analogy could be to the individual pages of a recordbook or a stock transaction ledger. New blocks are added to the end of the blockchain, and never changed or removed.

What is a transaction? 

A transaction shows coins which have been sent between one of more bitcoin addresses. Often transactions include an additional "change" output.

What are address tags?

Address tags are identifiers known to you only. They help you to manage your addresses efficiently.

What are public notes?

Public notes are embeddable short messages during the transaction. An example of a public note can be seen below:

How do I make a public note?

You can embed a public note when doing a transaction with Blockchain.info. Simply input your message in the column below when sending a transaction.

What is taint?

The taint is the percentage of funds received by an address that can be traced back to another address. An example of a taint analysis is: https://blockchain.info/taint/1dice6GV5Rz2iaifPvX7RMjfhaNPC8SXH

What is My Wallet?

My Wallet is free service which makes it easy to send and receive Bitcoins without needing to download a Bitcoin client, and update the blockchain. In short, My Wallet is a secure online wallet designed to simplify the use of Bitcoins for new and experienced users alike.

Are there any fees?

No, it is a free service. You may be asked to include a "miners fee" to help support the Bitcoin network, which is mandatory for the use of Bitcoins.

Is it secure?

Yes it is, we are protected from hacks as all of your private keys are encrypted with your password before leaving your computer. We do not hold a copy of your password, and thus are unable to view or spend your Bitcoins. You retain full control of your private keys, so your wallets can never be seized or blocked and can be imported into any desktop Bitcoin client.

Where can I find help?

Please create a ticket at Support Desk

Why does the price amount change over time in my wallet?

This is due to the constantly changing price of bitcoin, the price of one bitcoin follows the market patterns.

How do I send Bitcoins?

Please log in to your My Wallet account, and navigate to the 'Send Money' tab. Enter the destination Bitcoin address and the amount involved. You will be asked to confirm and to pay a miner's fee if needed.

How do I receive Bitcoins?

Please log in to your My Wallet account, navigate to the 'Receive Money' tab, and click the New Address option. Enter a label that corresponds to its purpose, i.e.: 'From Ben','From faucet'. Remember to back up your wallet frequently!

How do I back up my wallet?

Please log in to your My Wallet account, and choose a backup method listed there. Blockchain.info can upload an encrypted copy of your wallet to your Dropbox or Google Drive, and email you an encrypted copy of your wallet to your email. Alternatively, you can download your wallet directly.

How do I label an address?

Please log in to your My Wallet account, navigate to the 'Receive Money' tab, and and click Actions. Select the Label Address option, and enter the label accordingly.

How do I delete an address?

Please log in to your My Wallet account, navigate to the 'Receive Money' tab and click Actions.

We suggest that you do not delete your addresses directly, and instead archive it. If you really want to delete the key from your wallet, you can delete it in the Archived Addresses tab. (Warning! Bitcoins sent to this address in the future will be lost too!) 

What is Watch Only address?

Bitcoin Addresses come in two parts, a public part and a private part. The public part allows you to view the transactions and balance of a bitcoin address only. The private part is the important bit to prove that you are the owner of a Bitcoin address and is needed to be able to send funds from that address. If there is an address in your My Wallet account which is missing its private key, it will be marked "Watch Only" which means unless you have the private key saved up elsewhere you do not own the funds at that address and can only "Watch" them.

What is a paper wallet?

A paper wallet is analogous with a pre-signed check book that contains everything you need to send and receive money from your Bitcoin wallet. Paper wallets are one of, if not the most, secure way to store your Bitcoins. There is no way anyone can make unauthorized transactions on your behalf without stealing the paper document. We provide an easy way for you to make a secure paper wallet using My Wallet. Please see this tutorial.

What is two factor authentication?

Two factor authentication is as an approach to security authentication, which requires that the user of a system provide more than one form of verification in order to prove their identity and allow access to the system. Our users are protected from hacking attempts with the use of two factor authentication via Yubikeys, Google Authenticator, SMS message and Email.

How can I enable two factor authentication?

Please log in to your My Wallet account, and choose the Account Settings option. Navigate to the Security tab, and choose an authentication method.

Can I use a mobile device to access My Wallet?

Yes. There is an Android app and an iOS app available.

How to export a wallet to Multibit?

Please log in to your My Wallet account, and download a copy of your wallet. Start your Multibit Client up, and follow this guide.

How to import a Bitcoin-Qt wallet?

Please go to https://blockchain.info/wallet/import-wallet, and locate your wallet.dat file. Drag your wallet file into the area provided, and follow the instructions given.

Where is my wallet.dat file?

In Windows, go to Start -> Run (or press WinKey+R) and run this: explorer %APPDATA%\Bitcoin

In Mac, open Finder -> Press [shift] + [cmd] + [g] and enter ~/Library/Application Support/Bitcoin/

In Linux, the file will be located in ~/.bitcoin/

How do I close my account?

We apologize, but closing your account is not possible at the moment.

What if I forget my password?

Your Bitcoins in your wallet are unfortunately lost. We apologize, but due to our stringent security practices we do not have a copy of your password. Please periodically create paper backups of your wallet to prevent this unfortunate incident from happening.

Where can I find your privacy policy?

Our privacy policy can be found here

I have added a watch only address, but it is asking me for a private key to send a transaction? 

It is impossible to generate the private key unless it is saved somewhere else e.g. paper wallet. Without the private key you do not own the funds stored at this address.

How can I sign a Bitcoin message?

Please log in to your My Wallet account, navigate to the 'Receive Money' tab, and click the Action option.

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Beginner's Bitcoin FAQ Where to start?.

Bitcoin FAQ?

What is Bitcoin?

In non-technical language, Bitcoin is a digital currency in which transactions can be performed without the need for a credit card or central bank. It's designed to enable users to send money over the Internet in a very simple and efficient way.

Who runs Bitcoin? What is the company behind Bitcoin? 

In short, no one runs Bitcoin. Bitcoin is run collectively by the users who uses the Bitcoin Client, and any changes to the Bitcoin system have to be approved by the majority of users before they are implemented. 

What is a Bitcoin address?

A Bitcoin address is a unique identifier which allows you to receive Bitcoins. With PayPal you send funds to an email address, and similarly with Bitcoin you send funds to a Bitcoin address. For example, this is one of our Bitcoin addresses:  1JArS6jzE3AJ9sZ3aFij1BmTcpFGgN86hA

Please verify that you have copied the destination address exactly before sending Bitcoins to it.   Bitcoin transactions are not reversible!

What is a private key?

A private key is a secret code which allows the user to prove his ownership of his Bitcoins. Every Bitcoin address has a matching private key, which is saved in the wallet file of the person who owns the balance. The private key is mathematically related to the Bitcoin address, and is designed so that the Bitcoin address can be calculated from the private key, but importantly, the same cannot be done in reverse.

Please keep your private keys safe, and make periodic backups to prevent the loss of Bitcoins.  Anyone with your private keys can spend your Bitcoins!

What are the fees involved?

The transaction is usually free if the sum transacted is greater than 0.01 BTC. A token sum is imposed to provide some incentive to the miners to include the transaction in the blockchain..

At the moment, many transactions are typically processed in a way where no fee is expected at all, but for transactions which draw coins from many Bitcoin addresses and therefore have a large data size, a small transaction fee is usually expected. 

Please see the bitcoin wiki for calculating minimum fees.

What does 'unconfirmed' mean? 

It means that the transaction has not yet been included in the blockchain, and is still reversible. A transaction typically takes around 10 minutes to be confirmed. When that happens, it is said that one confirmation has occurred for the transaction. With each subsequent block that is found, the number of confirmations is increased by one. To protect against double spending, a transaction should not be considered as confirmed until a certain number of confirmations is seen. 

What is this 'blockchain' you talk about? 

The blockchain is a public ledger of all transactions in the Bitcoin network. Blockchain.info allows you to navigate the bitcoin blockchain. We also operate Bitcoin's largest and most secure wallet service. 

Who are the 'miners'? 

Miners are individuals who run computer systems to repeatedly calculate hashes with the intention to create a successful block and earn coins from transaction fees and new coins created with the block itself. The term references an analogy of gold miners who dig gold out of the ground and thus 'discover' new gold that can be used to create new coins, with a similar kind of discovery occurring with a successful hash to create new Bitcoins. 

Is there a limit to the amount of Bitcoins generated?

The number of Bitcoins in existence will never exceed 21 million. To see how many Bitcoins are in circulation, please go to: https://blockchain.info/charts/total-bitcoins

How much does a Bitcoin cost?

The current market price for a Bitcoin is always changing due to the supply and demand for it. Bitcoins are traded at Bitcoin Exchanges. A historical Bitcoin price chart can be found at: https://blockchain.info/charts/market-price

What is a Bitcoin Client?

Bitcoin clients are the base level of technology for conducting Bitcoin transactions, and they store the keys needed to conduct a Bitcoin transaction. They come in multiple flavors, and are customized to fit different niches.

The Bitcoin-QT Client (Downloadable at http://bitcoin.org/) is the original software written by Satoshi Nakamoto, the project's founder. If you aren't sure which program to pick, this is a good bet. It is suited for enthusiasts, merchants, miners, developers and people who want to help support the project. 

The MultiBit Client (Downloadable at https://multibit.org/) is fast and easy to use, even for people with no technical knowledge. It is also able to import Blockchain.info's wallet backups (Multibit version 5.17 and earlier), making it a versatile tool for all kinds of users.

The Electrum Client (Downloadable at http://electrum.org/) focuses at speed, with low resource usage and simplifying Bitcoin usage. Startup times are instant because it operates in conjunction with high-performance servers that handle the most complicated parts of the Bitcoin system.

Blockchain.info is also a form of Bitcoin client. We provide a web-based client with emphasis on speed, security, and ease of use.

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What is Bitcoin?

Bitcoin is a form of digital currency, created and held electronically. No one controls it. Bitcoins aren’t printed, like dollars or euros – they’re produced by people, and increasingly businesses, running computers all around the world, using software that solves mathematical problems.

How does Bitcoin work?

This is a question that often causes confusion. Here's a quick explanation!

The basics for a new user

As a new user, you can get started with Bitcoin without understanding the technical details. Once you have installed a Bitcoin wallet on your computer or mobile phone, it will generate your first Bitcoin address and you can create more whenever you need one. You can disclose your addresses to your friends so that they can pay you or vice versa. In fact, this is pretty similar to how email works, except that Bitcoin addresses should only be used once.

Balances - block chain

The block chain is a shared public ledger on which the entire Bitcoin network relies. All confirmed transactions are included in the block chain. This way, Bitcoin wallets can calculate their spendable balance and new transactions can be verified to be spending bitcoins that are actually owned by the spender. The integrity and the chronological order of the block chain are enforced with cryptography.

Transactions - private keys

A transaction is a transfer of value between Bitcoin wallets that gets included in the block chain. Bitcoin wallets keep a secret piece of data called a private key or seed, which is used to sign transactions, providing a mathematical proof that they have come from the owner of the wallet. The signature also prevents the transaction from being altered by anybody once it has been issued. All transactions are broadcast between users and usually begin to be confirmed by the network in the following 10 minutes, through a process called mining.

Processing - mining

Mining is a distributed consensus system that is used to confirm waiting transactions by including them in the block chain. It enforces a chronological order in the block chain, protects the neutrality of the network, and allows different computers to agree on the state of the system. To be confirmed, transactions must be packed in a block that fits very strict cryptographic rules that will be verified by the network. These rules prevent previous blocks from being modified because doing so would invalidate all following blocks. Mining also creates the equivalent of a competitive lottery that prevents any individual from easily adding new blocks consecutively in the block chain. This way, no individuals can control what is included in the block chain or replace parts of the block chain to roll back their own spends.

Going down the rabbit hole

This is only a very short and concise summary of the system. If you want to get into the details, you can read the original paper that describes the system's design, read the developer documentation, and explore the Bitcoin wiki.

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