Optimized encrypted currency wallet using a language such as python

Create your own portfolio of cryptographic assets and explain your reasoning.
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bitcoind – open source server for bitcoin wallet

For my simple bitcoin wallet, I use the blockcypher.com api.

There is a problem due to the limitation of the number of API requests. So I have to create my "api blockcypher.com", which would be used in my portfolio, but I have no idea of ​​its structure or its information. stored in the database and how it is structured. Most likely, the blockchain is scanned and a database is created for each wallet address for a quick call. A list of hashes for each portfolio may be indicated; it is then searched in the blockchain to create a transaction history. Therefore, I am looking for an open source project that I can install on my server and use for my project.

Priority in python, but other languages ​​are also possible.

wallet – I'm using a V9 solo antminer on my local bitcoind "pool", will I get paid?

Your chances of all return with a pool that is just non-existent.

The pool operation works because pools can accumulate a large amount of hash power from thousands of users. The pool's chances of finding a block are then quite high, which then allows them to use the block reward to pay proportional amounts to all their users.

As JBackzuk says in his commentary, solo mining is essentially impossible on the probabilistic plane. You find either the entire block or nothing – no partial shares.

wallet recovery – btc exchange CEX.10 can not send my Bitcoins

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paper wallet – how to get a bitcoin exchange?

Receiving funds in Bitcoin is a passive and asynchronous process.

A sender creates a transaction that uses some unspent transaction output (UTXO) and assigns the released value to the new UTXO. A UTXO typically specifies a quantity of bitcoin and certain spending conditions that must be met in order to consume the UTXO. The most common expense condition patterns are represented with Address.

When the users of the scholarships grant a fiat and / or a cryptocurrency to the custody of the stock exchange to access the scholarship order book, the user must request a withdrawal to recover their funds. In the withdrawal request, the user must specify how to lock the funds that he performs by providing an address from his wallet. The sending of a transaction is fully controlled by the sender: it only signs part of its funds to a lock script previously defined by the recipient. The recipient's wallet does not need to sign or veto. It is therefore perfectly possible that the recipient's wallet is not connected to the Internet and transcribed on a sheet of paper, provided that the recipient knows exactly what is the corresponding address.

wallet – Inserting a * .dat file into a new client

I miss ideas and hope to get some help.
My computer crashed but the wallet.dat file is on a USB key. I have downloaded and synchronized the v0.18.1 on a new computer, but I see no way to add the .dat file using the graphical interface. Do I have to use command line prompts? If this is the case, the appropriate procedure would be very useful.
I saw a similar situation on this forum but the advice given was on my head.
Thank you to everyone who can help.

confirmations – Bitcoin successfully deducted on the sender's wallet but did not reach the recipient's wallet

The situation is not entirely clear, but from what I understand, it seems that you are the sender and that the recipient does not recognize the payment you have sent.

I guess you have verified that the address credited 1Gouzjo9Jav1k4AmRoUJJMzidVfnMoSieS corresponds to the one you were supposed to pay, and the amount corresponds to the amount invoiced.

L & # 39; s address 1Gouzjo9Jav1k4AmRoUJJMzidVfnMoSieS received 0.02661900 BTC in the transaction b36157a7ca9630a88d98125fca91de81f488ef7d9a60f9e57af055d4d91f7a50. This transaction was written in the blockchain more than a day ago and is confirmed. Since it's the right address, the recipient has been paid, whatever they claim. Second, the money has already been spent again, which means that they must be fully aware that the money has arrived.

Assuming you paid the right address, the problem is on the recipient's side:
Either they gave you the wrong address that you paid correctly and another person received the money (unlikely), they do not understand that they have already been paid or have incorrectly accounted for your payment (unlikely, since you have already tried to follow up with them), or they lie to you.

You must contact them and firmly state that the requested address in question has been paid (after verifying that it fits well) and ask them to verify that their systems are working properly. This may encourage them to "suddenly find your payment".

In any case, do not send them more money, if they do not recognize that your payment was successful and deliver their part of your contract. Fraudsters often invent insane excuses to make you pay even more. If they do not recognize your payment, you may have to decide to write off the money or sue.

electrum – Is it possible to recreate a multisig wallet with only 2 private keys out of 3?

It is possible to transfer funds with only two private keys. However, you must still know the public key of the missing private key.

The public keys are needed to produce the redemption script, which is necessary to complete a transaction.

If you already know the redemption script (for example, it can be saved in an old wallet file or available in the blockchain if the same multisig address has already been used to send coins), then you can use the remaining coins. with only two keys (in a multisig 2 0f 3).

Transactions – Bitcoin successfully deducted on the shipper's portfolio but did not reach the recipient's wallet

The receiving address has received and already spent the coins, giving a balance equal to 0.

The recipient should always be able to see the transaction in the history of his wallet if he uses a consumer wallet. They may or may not see it with an exchange wallet or another type of payment processor.