How to sign a message?!

[nc50lc]

Guys many thanks for explanation & advices.
-snip-
BTW sorry for complete offtopic in here if some mod would decide to make a separate section about freebitco.in issues, kindly go ahead. I am just truly reader and once I faced this I just had to reply  

No problem.

Custodial service-related issues can be posted in this board: Bitcoin Forum > Economy > Marketplace > Service Discussion
If you got further concerns or updates, you can create a thread there.
They've also got their own thread in Gambling board: https://bitcointalk.org/index.php?topic=320959.17000 (link to the current last page)

[1714129923]

1714129923

[1714129923]

1714129923

[1714129923]

1714129923

[nofearko]

No problem.

Custodial service-related issues can be posted in this board: Bitcoin Forum > Economy > Marketplace > Service Discussion
If you got further concerns or updates, you can create a thread there.
They've also got their own thread in Gambling board: https://bitcointalk.org/index.php?topic=320959.17000 (link to the current last page)

Thanks man! For the future I can use this approach. For now I solved it, issue was on email provider side, SATS ARE SAFU ! 

[GeekWisdom]

Used my blackcoin address, testing to see if this works 

Code:

-----BEGIN BLACKCOIN SIGNED MESSAGE-----
Today is 2020-06-08. i am user GeekWisdom and i approve this message. (hopefully correctly)
-----BEGIN SIGNATURE-----
B9rdPbbPnzjsmkVa5MWNUq3RRXxw2QYkWd
IDLtx5Nt5Ty48RcvbTkWDOwnO8udgwO7t5RqYZVlirlvPXgn0DIYhUKRxw4GNSkytimLRsSZSkJTnGhepM/fHGc=
-----END BLACKCOIN SIGNED MESSAGE-----

[Chikito]

Used my blackcoin address, testing to see if this works 

Code:

-----BEGIN BLACKCOIN SIGNED MESSAGE-----
Today is 2020-06-08. i am user GeekWisdom and i approve this message. (hopefully correctly)
-----BEGIN SIGNATURE-----
B9rdPbbPnzjsmkVa5MWNUq3RRXxw2QYkWd
IDLtx5Nt5Ty48RcvbTkWDOwnO8udgwO7t5RqYZVlirlvPXgn0DIYhUKRxw4GNSkytimLRsSZSkJTnGhepM/fHGc=
-----END BLACKCOIN SIGNED MESSAGE-----

No, this tutorial thread for bitcoin, you must try sign message in bitcoin wallets such as bitcoin core or electrum. The method is the same away as what you have tried - Verified -

[GeekWisdom]

No, this tutorial thread for bitcoin, you must try sign message in bitcoin wallets such as bitcoin core or electrum. The method is the same away as what you have tried - Verified -

Okay, here it is with a bitcoin address then 

Code:

-----BEGIN BITCOIN SIGNED MESSAGE-----
Today is Tuesday June 8th 2021. I am GeekWisdom and i own this address. Thanks to shorena for the tutorial
-----BEGIN SIGNATURE-----
1Apqmd4bQBaazqvRPA4Si8LzLvGjRaf3bQ
IErW5+wRkq+i2ZU8v1XuBrZ1us5N/gUJBhUzWd2jIhIfcwPaxswMLpAIs7RA+6kimwKNqcc60bvcoVDvd2WABkc=
-----END BITCOIN SIGNED MESSAGE-----

[Husna QA]

Okay, here it is with a bitcoin address then 

Code:

-----BEGIN BITCOIN SIGNED MESSAGE-----
Today is Tuesday June 8th 2021. I am GeekWisdom and i own this address. Thanks to shorena for the tutorial
-----BEGIN SIGNATURE-----
1Apqmd4bQBaazqvRPA4Si8LzLvGjRaf3bQ
IErW5+wRkq+i2ZU8v1XuBrZ1us5N/gUJBhUzWd2jIhIfcwPaxswMLpAIs7RA+6kimwKNqcc60bvcoVDvd2WABkc=
-----END BITCOIN SIGNED MESSAGE-----

Verified


Posting a Bitcoin address sign message can also be used for the account recovery process, so I suggest that you save the information carefully to be able to access the bitcoin address.

Maybe you can consider posting it in the following thread:
Stake your Bitcoin address here

[GeekWisdom]

Posting a Bitcoin address sign message can also be used for the account recovery process, so I suggest that you save the information carefully to be able to access the bitcoin address.

Thanks but there is still something I don't quote understand.  When I signed my message, I used the received address in the wallet, and the address has $0 balance.

Let us say I wanted to send some bitcoin to someone, and they wanted to verify that I had the funds to pay for the transaction.

Is there a way I can 'sign' a non-zero address containing the required funds to show that a) The $ is mine to send and b) The $ is enough to cover the cost of the transaction


Would it be possible ? - (or even make sense?) to sign the message in such a way that  ? - It seems it should, I just think I'm missing something

Tks.

[Pmalek]

Is there a way I can 'sign' a non-zero address containing the required funds to show that a) The $ is mine to send and b) The $ is enough to cover the cost of the transaction

The signing process of funded addresses is the same as for empty ones. If you sign a message from an address that contains bitcoin, you effectively own that address and the coins in it.

Regarding point b, it depends. If you are supposed to send a client 0.2 BTC and you sign an address which contains only 0.1 BTC, the client will know (if he checks) that you don't have the required amount. If it's the other way around, he can see you have enough. 

[Husna QA]

-snip-
Let us say I wanted to send some bitcoin to someone, and they wanted to verify that I had the funds to pay for the transaction.

Is there a way I can 'sign' a non-zero address containing the required funds to show that a) The $ is mine to send and b) The $ is enough to cover the cost of the transaction

When you can sign messages from a Bitcoin address, you can also access the assets there. It's because you have access to the private key or seed of that Bitcoin address. Other people who do not have the private key/seed cannot create a signed message from your bitcoin address, for example:



As Pmalek explained above, when someone wants to know if you have enough funds or not to send from the Bitcoin address to which you signed the message, they can see it through Bitcoin Block Explorer, e.g.: https://mempool.space/address/1Apqmd4bQBaazqvRPA4Si8LzLvGjRaf3bQ

[GeekWisdom]

Okay so as a test I sent 2 transactions to my bitcoin wallet.

One for        0.00011792 BTC to  1Apqmd4bQBaazqvRPA4Si8LzLvGjRaf3bQ (the one I signed already)
Another for  .0.00011828 BTC to  1PMHH5BHtr1WEpesJcBPBZ2FZDdfURkohG (which is address that appeared in the receive after the first transaction)

My wallet showed the sum of both addresses once confirmation was completed.

Then I sent 0.00016200 BTC back to the originating address.

The receiving block chain transaction https://mempool.space/tx/4b941d7b2b0bc274f90d4d8310fbed3e640ffe9a5924389b73a85870b72d7cb9

Shows that most of the BTC came out of the second address (emptied it completely) and 0.00001200 BTC came out of the first address, and I'm assuming carried with it a hefty fee do to the small amount in the transaction of the second address ? (Fee was like 0.00007420 BTC)

So.. it seems, that the balance in my wallet, is simply the sum of all addresses in the blockchain for which I can 'sign' for with my private key.

If I had sent x bitcoin distributed over 20 addresses, I would have to:

a) Consolidate them amount all into one address before sending (which I'm guessing would also save me on tx fees?)

b) Send signatures for every address in the transaction to prove it was me that sent the money for all of them
(and not just 20 other random people sending small amounts)

Am I understanding this correctly?

[jamyr]

~
If I had sent x bitcoin distributed over 20 addresses, I would have to:

a) Consolidate them amount all into one address before sending (which I'm guessing would also save me on tx fees?)

b) Send signatures for every address in the transaction to prove it was me that sent the money for all of them
(and not just 20 other random people sending small amounts)

Am I understanding this correctly?

I guess,

For a: If the process of consolidation is free or it doesn't charge you more than the other process, then consolidate it.
For b: If you consolidate and make the payment from a single address, then you only need to sign from that address.


(not really sure if this is correct, since I used a custodial wallet more)
edit: btw this might be a little off-topic, so may I suggest next time to create a different topic.

[Pmalek]

Okay so as a test I sent 2 transactions to my bitcoin wallet.

One for        0.00011792 BTC to  1Apqmd4bQBaazqvRPA4Si8LzLvGjRaf3bQ (the one I signed already)
Another for  .0.00011828 BTC to  1PMHH5BHtr1WEpesJcBPBZ2FZDdfURkohG (which is address that appeared in the receive after the first transaction)

My wallet showed the sum of both addresses once confirmation was completed.

Then I sent 0.00016200 BTC back to the originating address.

The receiving block chain transaction https://mempool.space/tx/4b941d7b2b0bc274f90d4d8310fbed3e640ffe9a5924389b73a85870b72d7cb9

Shows that most of the BTC came out of the second address (emptied it completely) and 0.00001200 BTC came out of the first address, and I'm assuming carried with it a hefty fee do to the small amount in the transaction of the second address ? (Fee was like 0.00007420 BTC)

The amounts that are being transferred don't affect the total fee that the sender has to pay. The fee is determined by the number of inputs and outputs, type of addresses being used (Segwit or Legacy), and things like 2FA, multisig scripts, etc. That transaction of yours had two inputs. If one of the addresses you initially sent to had enough coins, you could have used only that input and paid less in transaction fees. A transaction of 0.00016200 BTC made up of 2 inputs is more expensive than a 1 BTC transaction that only has 1 input (if the same sat/vbyte fees were used).   

So.. it seems, that the balance in my wallet, is simply the sum of all addresses in the blockchain for which I can 'sign' for with my private key.

Private keys - plural. Each address has a different private key.

a) Consolidate them amount all into one address before sending (which I'm guessing would also save me on tx fees?)

If you consolidate your inputs at a time when the transaction fees are low, you will save money when it's time to move those coins elsewhere since you will only be spending from 1 input. Remember what I said before, the amount of coins you send doesn't affect the mining fees you pay. Inputs and outputs do. 

b) Send signatures for every address in the transaction to prove it was me that sent the money for all of them
(and not just 20 other random people sending small amounts)

Another reason to consolidate and avoid the hassle of multiple signed messages from multiple addresses.

[crypto_trader#43xzEXrP]

Code:

-----BEGIN BITCOIN SIGNED MESSAGE-----
I am username1565, my github-account is https://github.com/username1565
I own this address 1CCtFYeScZBS2AMJATXXKYBqBG1LjMEEzo , and I'm approve this,
and I can approve in future, by signing message, with private key from this address,
and approve that it's really me, and not someone else.

var date; console.log((date = new Date(), date.getTime())+', '+date) //1627192283917, Sun Jul 25 2021 07:51:23 GMT+0200 (GMT+02:00)
-----BEGIN SIGNATURE-----
1CCtFYeScZBS2AMJATXXKYBqBG1LjMEEzo
HIb/7M398hVJgQxDDtXv0KKCm+zMgAVfDXG2aOiRHeWtGhbSwaP171ZUZ9jrBRuPVOa96bilSXz9vI4NNOVGKdQ=
-----END BITCOIN SIGNED MESSAGE-----

permalink

[Psycopyro]

Code:

Thanks for your thread.
Now I can sign message, I will have a look to the encrypted messages!
Address: 1Ep4E4FqoqRqEfHG9MtZxvMkKyyEJqpfzR
Signature: IPWoXVjielX3kTu9ORO4MQaZjoONjf/kysevFpDDvgjqSOTH4R/slBuZ7yso/jfomRZfqmWMipsSlg2UFzcg5ns=

[Davidyyyyy]

I need help . Who can help me ? 2 months ago I lost my phone I can’t use 2FA code to login my Freebitco.in account. I want to remove 2FA code and the staff told me come here to sign message. But I don’t now how to do

[nc50lc]

-snip- I want to remove 2FA code and the staff told me come here to sign message. But I don’t now how to do

The instructions are in the first page - first post.
If your wallet is not in the list, try to find a similar feature in your wallet, usually, it's named as "sign message".

If there's none, you can import the private key of the address to one of the wallets in the OP with "sign message" and "import private key" feature.
Then sign a message using it.

[Davidyyyyy]

But I not have private key . I only have public address

[Upgrade00]

But I not have private key . I only have public address

Signing an address is to show ownership of it, and this is only proven by showing access to the private keys.
The public address is accessible by others and the public key is revealed when an address signs a transaction, but the private keys are only accessible to the owner of the address (except when compromised) that is why it is used to prove ownership.

[Coin_trader]

But I not have private key . I only have public address

How come you get only public address without acquiring public during your wallet setup? If you are just recently created a wallet, you will get 12 word seed phrase instead of private key if you use electrum wallet then proceed on the instructions. You might counter some changes since the guide is outdated due to inactivity of OP.

[SFR10]

But I not have private key . I only have public address

How come you get only public address without acquiring public during your wallet setup?

He probably used an address from a cryptocurrency exchange ^{[custodial wallet]}.
@Davidyyyyy
If I was right, then there's no way for you to sign a message, but if that's not the case, then you should mention the name of the wallet in question, so we could try to find a solution ^{[if there's any]}.