Seems like you messed up the url there... I get the error 'image not found' when i try to visit your screenshot...

Well, it's just a private key.. I guess there should be other SPV wallets on iOS that allow you to import said key. But like i said: it's been years since i last touched any apple product.

You could check out bluewallet or breadwallet. There's no guarantee tough, but if you check them out and decide to trust them, it might be worth trying out.

To be honest, it's been years since i last touched any apple product... Aren't there any equivalent wallets for iOS? I've heared about breadwallet years ago, but i have no clue if it's any good...
I have bluewallet installed on my android device, i'm unsure if you can import private keys tough, but i do know it supports quite a bit of restore options.

I just believe in giving the OP the option of a fast and secure sollution that teaches him just enough to get by, or offering him the option of actually finding out what went wrong with coinb.in.

I still suspect you messed up the transaction somehow because of it's size (118 bytes).

The fastest way to fix this problem would still be my initial idear: download electrum, restore wallet, use the private key, use electrum's gui to spend your funds.

Offcourse, if you want to learn what went wrong, you'll need to describe all the steps you took, or you'll have to share the transaction, or you can try using a decoder that gives a better output than coinbin's. For example: https://live.blockcypher.com/btc/decodetx/

118 bytes sounds very small to me... IIRC, coinb.in generates legacy wallets, i'd expect a tx with a size of >190 bytes when spending from a legacy wallet

Also, i tried to decode a signed transaction i picked from my current mempool and the output i get is the following:


Is there an input and output section when you try to decode the tx?

I'm not a mac user... I tought iOS = OSX, but apparently i'm wrong... There's an OSX version downloadable @ electrum.org/#download, but i don't see an iOS version

Well.. You were going to broadcast the transaction anyways. Since you're using a throwaway account, you might aswell show us this signed transaction so we can have a look at it. Showing us said transaction could potentially decrease your privacy. It's also a possibility to PM your tx to a trusted user.

An other option would be to download electrum from electrum.org, verify electrum's signature (the binary HAS to be signed by ThomasV), create a new wallet using your private key and spend your funds from electrum's gui.

Even better, if you only have a private key, you can import said key in a decent desktop wallet (like electrum, or bitcoin core) instead of falling in the same trap of online wallets again...

I guess it depends on the definition of "seed phrase" you want to use. But the definition of the wiki is the following:

Source: https://en.bitcoin.it/wiki/Seed_phrase

This defenition doesn't mention bip39, master private keys, stretching, derivation paths, HD wallets,...

So, if you interprete OP's question very strictly, HCP's and BASE16's answer is more correct than mine. Using their workflow, you can indeed generate a seed phrase that "stores all the information needed to recover Bitcoin funds on-chain". It doens't really matter that you can encode and recover about any ascii string using said method, nor does it matter that if you use the seed on a BIP39 compatible wallet, your initial private key will not be derived from said seed.
This being said, above defenition from the wiki is so broad you could basically take a hex encoded private key and use the NATO alphabet to "convert" your private key into a seed phrase of 64 seed words... This would still fall withing the defenition of a seed phrase (i guess).

I didn't pay close attention to the OP's question... IF he would have asked if it was possible to take a single private key and generate a mnemonic that could be used to restore a BIP39 compatible HD wallet in such a way that the initial private key would be derived from the master private key generated from the mnemonic, the answer i gave initially (no) would have been correct.
But in this specific case, i guess i assumed to much and i was wrong.

@Dydy94: non-english posts are only acceptable in the regional subforum... Your post will probably be deleted soon, so i tought i'd post the url to pastebin in case your post "dissapears":

https://pastebin.com/SwHLAAQT

I agree... Sorry for the mixup.
For future reference: there is a theoretical way to convert a private key to a mnemonic seed, but it's not a bip39 compatible seed, you'd basically have to convert your private key to hex, use it as entropy for your seed. If you want to use the seed you'd then afterwards look at the entropy from this seed and use said entropy as a private key. This basically makes this method a smart way of "encoding" your private key, but i don't think this is what the op meanth with his question.

So, if the rest is TL;DR; i think this can be summarised as:

Yes, there is a way to convert a private key into a seed phrase... But this seed phrase is only usefull if you find it easyer to nod down 24 words instead of a private key. If you wanted to use the seed to create a wallet, you'd need to convert the seed phrase back to single private key and import this key, resulting in a non-HD wallet

No, there is no way to convert your private key into a bip39 seed phrase that can be imported in a HD wallet (like electrum). Well, the seed phrase is valid, but the derived keys will not match your original key.

Basically, i was focussing on the "no"-part, but in hindsight, the OP never dictated that it had to be a bip39 compatible seed, wich would make BASE16's and HCP's answer more correct than mine... I assumed to much when i read the OP

I'm lucky BASE16 didn't take me up on my offer to make a bet, cause he'd have won given the fact i was making assumptions that were never specified...

Well, aparently i didn't think this one trough completely... Thanks to @HCP and @BASE16

I assumed the OP wanted a way to generate a mnemonic seed that could be used in a bip39 compatible wallet... But yeah, HCP's method would work eventough it would just add additional complexity to restoring instead of simplifying things.

well... that's a valid seed... If i use the "default" bip39 legacy derivation path (m/44'/0'/0') the first address is:
1J99qJyhe7BZGzx9L9ppBQ1yfYVzUuPrBp

That's not exactly
1tthHGi8L1dRqC5uDAbQjT6un3QMucEGu

Then show me how... I just visited https://iancoleman.io/bip39/ and generated a random seed...
Here's the first address/private key:

1tthHGi8L1dRqC5uDAbQjT6un3QMucEGu => L4XSR8Ufpfg3Fnd68z3E9sTahDnbzmssJc6Dkc6nm9P5xAUbR3Fb

This is the info you'd find on a paper wallet...

Now, by all means... Publish the seed phrase...

Are you willing to make a small bet to make things interesting?

A paper wallet usually contains a private key and the public key hash (the address). You can't create a BIP39 mnemonic seedphrase with this data.

The seed phrase goes trough a hash function, such a function is one-way by design.

I use wasabi as.my day to day wallet. Please explain how you'd find my ip address.
The claim you're making has been contradicted multiple times in this very thread. This claim is only true if you use "bad" wallets (like web wallets)

Most of this has already been covered in this thread...

Nope

That's a question you should ask those finance organisations or countrys...
This being said, on a technical level, no ip or username is stored on the blockchain. The blockchain basically stores witch unspent output is funding which address. When you create a new transaction you use one (or more) unspent outputs funding an address you controll as input for your transaction, removing it from the utxo db. When your transaction is broadcasted (and confirmed) the output of your transaction is now a new unspent output that's stored in the utxo db.

A company or governement can easily parse the blocks and re-create the current utxo db, and all historic transactions, but the only way they can add a name or ip to a transaction is if you were careless when broadcasting your transaction or careless when disclosing witch address(es) belong to your wallet.

Now, there are ways of adding ip's to transactions with a certain degree of certainty. If you run hundreds of SPV nodes and full nodes and have access to the logs of big blockchain explorers and web wallets, you could (theoretically) start data mining and start to find correlations between unspent outputs being spent in the same transaction, log ip's from nodes that broadcast a certain tx to your node, store lookups from spv clients, dig trough bitcoin explorer's webserver logs, dig trough webwallets webserver logs,... If you have terrabytes of logs of all these services, and you write a very powerfull data mining application, i'm relatively certain that you'll be able to attach ip's to a lot of newer wallets with a relatively high degree of certainty. But this is a completely different discussion.

@BitMaxz: yeah, i've bought tons of stuff from them, they used to be reasonably customer-friendly as far as chinese webshops go. I mean, if you want a shop that honours their guarantee period, answers customer's questions and gives after-sale support, you shouldn't buy from any of those buy-in-china shops.

But hey, their prices are good, shipping is free, and they have an import duty assurance (if you take this assurance, and you have to pay import duties, they reimburse you).
I bought several smarthpones from them, smartboxes, led's, puzzles, rPi accesoires, heatsinks, computer accesoires,...

But lately, i do start to think they're going downhill. I bought a xiaomi redmi 7A from them over 2 months ago, last week i enquired why they didn't send this smartphone after 2 months of waiting. Instead of apologising for the delay, they just told me the smartphone was out of stock and they would refund me.
To bad I had to open a ticket and ask them what was the holdup before they decided to inform me they had oversold this item.
Even worse is that after a couple of days, i also purchased a silicon case for the redmi 7A, and a hardened glass screen protector. Both of these items arrived at my doorstep weeks ago, but they're pretty much useless to me now since dx has cancelled my smartphone order. I'm now in the process of convincing them that, eventough i did receive the silicon case and the glass screen protector, these items are worthless to me now that they've decided to cancel my smartphone order...

Now, back to the issue at hand: if they're starting to sell cloudmining contracts, i would consider this a big red warning flag...

I just noticed a new tab on dx.com:



Does anybody have any info on this? I don't see any bitcoin logo or deposit address anywhere?

1) export the private keys
2) download electrum from electrum.org
3) check electrum's signature (the binary HAS to be signed by ThomasV)
4) when you open electrum, a wizard should appear guiding you trough the process of making a wallet.
4.a) pick a name for your wallet (next)
4.b) chose the option "import Bitcoin addresses or private keys" (next)
4.c) paste the private keys you exported from bitcoin core (next)
4.d) chose a STRONG password (repeat) (next)
4.e) REMOVE the unencrypted file you used to store the exported private keys
4.f) wait a couple of minutes... Electrum will download the block headers... It should take only a couple of minutes tough. But if you exported a long list of private keys, it can take a while... Electrum has to communicate with electrum's nodes and ask for a list of unspent outputs funding each address.

PS.1) Ideally, there is also a fifth step: You have manipulated your wallet.dat quite a bit. You have exported private keys. You have stored your wallet on other media... It's a good idear to make a new, CLEAN wallet, and move all your funds from the wallet containing the imported private keys to a brand new, freshly generated wallet... When creating a new wallet, write down the seed phrase, never store it digitally, but make sure you have a physical, offline copy of said phrase. Don't show the phrase to anybody else, it's private!

PS.2) If you have more than a couple hundred bucks worth of BTC, i'd suggest buying a hardware wallet (ledger and trezor are the most popular brands). If not: learn to make paper wallets in a proper way (completely offline + using the right tools). If not: make an airgapped setup using bitcoin core or electrum using a dedicated pc or a Tails OS usbstick

PS.3) if you opt for a paper wallet or an airgapped setup, do the steps with testnet coins first... Make sure you know how to generate a paper wallet or airgapped setup on the testnet, fund your wallet with testnet BTC, create a transaction spending your funds on the testnet... Only when you are 100% certain about the procedure continue on the main net!

PS.4) It's an old wallet, bitcoin forked quite a bit after unspent outputs funding your addresses were stored on the blockchain. The private keys for these addresses can also be used on several other blockchains to claim a lot of forked coins!!! AFTER you moved all your BTC to a new wallet, you should look into this. BCH/BSV/... are worth considerably less than BTC, but it might still be a good idear to claim and sell them