12

If you are missing the first word and you know the rest of the 11 words, there are 2048 possible mnemonics but only ~128 of them are valid. Using Python and this library you can print all the valid ones with this simple script: from cryptotools.BTC.HD import check, WORDS phrase = "{x} decrease enjoy credit fold prepare school midnight flower wrong ...


6

I built a dedicated testnet wallet during a weekend hackathon http://testnetwallet.com


6

Great resources here to help you select an individual wallet: https://bitcoin.org/en/choose-your-wallet Truthfully, having your own wallet that works across Windows/Android/Chrome might be on the tricky side for beginners. If you don't mind a web-based wallet where it's controlled by another party, I'd suggest using Coinbase, Xapo, or Circle as the easiest ...


6

I'd recommend to read up on Bitcoin to understand what you're doing. Then you can find an overview of wallets on bitcoin.org, but for a quick start, the fastest way to get started is: Desktop (Windows/Mac/Linux) : Electrum or MultiBit Android : Bitcoin Wallet by Andreas Schildbach iOS : Bread Wallet Windows phone : Get an Android phone instead These are ...


5

I tested it by creating a secure wallet on BitGo. They gave a multisig address for deposits. 2/3 of keys are needed to withdraw Bitcoins. BitGo holds one key, you get private key and backup key. You don't need to printed private key to withdraw Bitcoins. the passphrase is enough (apparently the key is derived form the passphrase). BitGo cannot do Bitcoin ...


5

If it is a web wallet that holds your private keys, then it is certainly possible that the service is staking your coins for you, but this may or may not be a feature that the developers of the particular web wallet have implemented. It is also possible that the web wallet creators take the stake as a payment for their service, which I hope the service would ...


4

At Justcoin.com, we've used a few different methods over the years: Generate addresses using bitcoind, now called bitcoin core, when we need them. To avoid key loss in the case of storage failure, we use a large key pool. The command is simply getnewaddress. Hierarchical deterministic wallets are much better and we use these for an increasing number of ...


4

Personally I would recommend Electrum, it's a local wallet, doesn't require you to download the entire blockchain, has good features with regards to recoverability and accessibility. Also you can run it in multiple locations at the same time (something the standard bitcoin wallet doesn't allow you to do), and you can also run it on your phone provided it's ...


4

A bitcoin private key is a random 256 bit number. A bitcoin address is deterministically derived from that private key. Everyone uses the same procedure to do so. Therefore, it is impossible to figure out where you created the wallet based one a bitcoin address. Your browser history, however, might lead you to the correct website. You can limit the websites ...


4

Bitcoin is supposed to be permissionless and censorship resistant. That's the whole point. So, no, you can't do that.


4

Android Lightning Network wallets https://github.com/ACINQ/eclair-mobile https://lightning-wallet.com


3

This site is not really meant for product reviews or recommendations. Anything answered here might be outdated in a few months or years. And it might actually turn out to point to a scam site if the domain or whole wallet is taken over by evil people. It's probably safer to only point to www.bitcoin.org and follow the steps there, one of which is choosing ...


3

I am planning on building a small e-wallet website to learn the basics of encryption and handling accounts, transactions, and balances in Bitcoin. This is really not the place to learn. Even the most hardened Bitcoin services get attacked on a regular basis. Using brainwallet, the process for account creation is this: "Brain wallets" are an incredibly ...


3

Sending to P2SH addresses (addresses starting with '3') seems to be directly supported by only Bitcoin-Qt/bitcoind and Electrum at the moment. EWallets using those clients might allow sending to P2SH addresses. It's not directly supported by BitcoinJ, so BitcoinJ-based clients like MultiBit and Bitcoin Wallet for Android probably won't support it until ...


3

MtGox can disappear temporarily or permanently and take all your e-wallet bitcoins with it. Mt. Gox has been severely hacked, with a massive reserve of its bitcoins stolen. ... a massive hack that has stolen as many as 744,000 bitcoins, fully 6% of all bitcoins in existence. ... "MtGox can go bankrupt at any moment". Forbes 2/25/2014 I don't know of ...


3

To support timely settlement services outside an exchange's platform, around 1/12 to 1/16 value of an exchange's cryptocurrency value will probably need to be placed in hot storage. The rest will be in cold storage. Conceptually, fractional hot to cold storage ratios are analogous to fractional reserve banking and PBX trunk sizing. The cybersecurity ante ...


3

Quick primer: The identifier is a dash separated lowercase bit of text, like a32d0de4-818b-4aa3-... It's specific to blockchain.info - other wallets use different systems. It was probably emailed to you. The mnemonic is a 17 word bit of text, like skill course bleed oversize attempting lazer endure... A bitcoin address looks like ...


3

You don't have a Coinbase wallet address, you have a Coinbase deposit address that's used to deposit bitcoins into your wallet. Coinbase sweeps funds from deposit addresses into their secure holding accounts.


3

No, bcdwallet.org is not legit; it will just steal your bitcoins. Because the website is asking for a Bitcoin wallet seed, which can be used by them to immediately steal your bitcoins, it's almost certainly a scam. When I do a search for the website in Google, there are very few results, so it doesn't have any good reputation to speak of. The domain name ...


3

This is exactly what is supposed to not be possible and gives value to the blockchain. So, unless you have an advanced quantum computer at your disposal I'm afraid you will not be able to do it.


2

Any wallet that is listed on Bitcoin.org's Choose Your Wallet page is a good choice. In order for a wallet to be listed on that page, it must meet several criteria. These include usability, security, and availability of source code. The website also includes details about the wallets listed and some information about the security, privacy, and usability that ...


2

They can avoid the fees in two ways. First, they can choose to batch multiple small transactions together into a single transaction with multiple outputs. Second, since they have a large pool of bitcoins, they can more easily form transactions that qualify to be free transactions, for payouts over 0.01 BTC. The most efficient way to form these free ...


2

This is a project I discovered to be quite effective at evaluating the privacy provided by each wallet. Obviously in most cases, choosing a wallet is based on a trade-off between privacy/security and convenience and I found this particular repository to be useful at considering various aspects of a wallet. Open Bitcoin Privacy Project Various well-known ...


2

This really depends on the exchange website's policies. But in general money is a local wallet behaves just as what a wallet in real life would do: store money without any fees or interest. As long as you (and only you) own the wallet file (normally wallet.dat) you control whats being done with the money. On the other hand, money stored on a website/...


2

Only the respective trade-offs of trusting another party with your money vs trusting yourself not to lose your data. When you keep your money on an exchange website or online wallet service, you are not only trusting their good intentions, but also that they stay in business and are running a secure service. A significant number of exchanges and OWS have ...


2

That's a paper wallet. Search for that. bitaddress.org or paperwallet.com are examples. The way you intend to use it basically comes down to printing the private key part of a bitcoin wallet and giving that to someone else. Another use would be putting it in a safe so you can't get hacked.


2

Security of BitGo is similar to that of hosted wallets. While they don't normally have access to both of your keys, they can always serve Javascript which will send your password to their server. On the other hand, if there is malware on your computer, even if it can't get your backup key, it can still make transactions on your behalf (if 2FA is required for ...


2

BitcoinJ is the Java open source library used by many popular wallets, including Bitcoin Wallet for Android, MultiBit, GreenAddress GreenBits, and lots more. It supports some sort of encryption of private keys, although it may not be AES-256-CBC (but it probably is). HD Wallets It's worth noting that BitcoinJ was recently upgraded to support creating and ...


2

If you click in the top left that brings up the menu, select "Request". You will then be shown a screen with a QR code, your bitcoin address is below that QR.


2

I don't use coinbase, but Xapo does exactly what you describe. They instantly transfer the funds to another wallet and move them around. Probably some algos deciding what goes into cold storage and what stays, based on current outgoing flow demand. At the same time that you're sending btc to coinbase, many users will be withdrawing; hence they probably ...


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