Topic: Web service like MEW for Bitcoin ? (Read 249 times)

Thank you Mocacinno, I asked because I read, it was possible that in "Mt.Gox".

the coins will not be moved to the new wallet...

If you have privatekey1 whose public key hash (commonly known as the "address") is 1address1, and you sweep privatekey1 into any other wallet, what happens is:
1) the "receiving" wallet will do a scan for any unspent outputs funding address1 AT THAT TIME
2) if it finds unspent outputs, it'll generate a new deposit address (it's possible the receiving wallet has a buffer of unused new deposit addresses). Let's call it 1addressfromnewwallet2
3) the receiving wallet will create a new transaction, spending all unspent outputs from step 1 and funding the new deposit address from step 2 (1addressfromnewwallet2)
4) the transaction from step 3 will be signed with privatekey1 (the key you're sweeping) and broadcasted.
5) since the receiving wallet has the private key whose public key hash is 1addressfromnewwallet2, it'll monitor this address for new unspent outputs, and it'll be able to spend those funds

If, after the initial sweep, somebody funds 1address1 again, those unspent outputs won't "magically" move to the address generated by the wallet you swept the coins in... You can, however, repeat the sweeping process as many times as you want...

There is a "variant"... If you import privatekey1 instead of sweeping it, both the original wallet as the new wallet start monitoring 1address1, in this case, for the untrained eye, it will look like the new funds magically "move" to the new wallet even after the intial import. However: since both the old and the new wallet have privatekey1, and they're both monitoring 1address1, both wallets are able to spend any unspent outputs funding 1address1. This might be a desirable feature in some usecases, or an undesired feature in other usecases!

I know about the dangers in online wallets, and how to use a cold - hot wallet.
The question could be formed like this:

If a swept address in an online wallet has 0 coins, and someone sends some coins there (some time later), will the coins be moved to the "web address" ?

What Mocacinno said. Web wallet services like MyEtherWallet are simply just very convenient to use, but with convenience, comes great security risks. Keep your spending wallet on a mobile wallet, and majority of your holdings on a hardware wallet like the Trezor[1] or the Ledger Nano S[2], or a paper wallet if you know how to make one in a secure manner.

I highly suggest reading this post here, for you to have an idea on what the advantages and disadvantages of the kinds of wallets are. Topic: [General] Bitcoin Wallets - Which, what, why?

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[1] https://trezor.io/
[2] https://ledger.com/

i would never import my private key in a webwallet look on the internet how many exchanges and wallets been "hacked".. use electrum if you dont have enough space to sync all blocks

Web wallet is vulnerable to online threats and security issues I advised use app or desktop Im using mycelium for years now and everything you need in a bitcoin wallet has it.  

Other Bitcoin Webwallets are
➖ Coin Space
➖ BTC.com
Procedure to import keys on BTC.com
How do I import my private key into the wallet?

I suggest you better export/import the privatekey in the Bitcoin local wallet. export/import private keys online is not safe.

I think greenaddress allows you to sweep private keys: https://greenaddress.it/

HOWEVER, is there a reason you're asking for a WEB service? Web wallets are the worst kind of wallets security-wise...
If you're not the only one in controll of your private keys, you're not the only one in controll of your funds.

Please, switch to a desktop wallet on a clean pc, or if you're holding more than a couple hundred bucks worth of crypto currencie, switch to a hardware wallet or a paper wallet (or a wallet on an airgapped machine).

Is there any web service, like MEW?
It should be able to import or sweep private keys (blockchain-dot-com) does not.
Thank you.