When we do a transaction, we pick UTXOs we want to spend. Sounds simple, just pick UTXOs with total value >= the amount you want to spend. But then inscriptions, rare sats etc. come into play. Now, some UTXOs are not safe to spend. How do I pick UTXOs, which are safe to spend? Is there an easy way to make sure a UTXO doesn't have rare sats/inscriptions/anything else before spending it ..read more

I just found a list of 25 english words (not my native language) on a white paper in my mother's house. This has to be old, because i don't touch that desk for a long time, 10+ years. I have been searching for some info, regarding the 25 seed phrases but i dont have any conclusive anwser. I found the BIP0039 dictionary, but the problem is that half of my words are not on this list. Words like, flute, salute, point, are not on the BIP0039. I dont know what coin it belongs neither what wallet i used back then. I rembember waiting 1 day to syncronize the blockchain to my computer, but i already t ..read more

I have a few questions on checkpointData in src/kernel/chainparams.cpp file. This variable seems stopped being updated from approximately 10 years ago, judging by the timestamp of the height of the most recent checkpoint block. Also, I noticed that this variable is only used in the ContextualCheckBlockHeader function in src/validation.cpp file. The role of checkpoints seems pretty obvious. // Don't accept any forks from the main chain prior to last checkpoint. // GetLastCheckpoint finds the last checkpoint in MapCheckpoints that's in our // BlockIndex(). By navigating through multiple posts ..read more

I would like to add some security to my seed phrase storage for existing wallets. I'm not trying to make it absolutely secure, just want to make it much more difficult to access my fund if someone finds my seed phrase storage. I'm considering this approach: convert the seed phrase to entropy encrypt entropy with a password convert the encrypted-entropy to a new seed phrase (which is longer) store the encrypted seed phrase Then, I do the reverse to retrieve the initial seed phrase when needed. I have included JS code to demonstrate it below. I used AES CEB without initial vector, and empty ke ..read more

In a time warp attack, an attacker can reduce proof of work difficulty to its minimum, which allows even a single piece of modern mining equipment to create large numbers of blocks per second. However, these blocks must follow the median time past consensus rule of each block having a block header time greater than the median of the previous 11 blocks' header times. The blocks also can't use a header time more than two hours in the future if they want to be accepted immediately by full nodes. The block header time field is an integer representing seconds since the Unix epoch. Given those const ..read more

i would like to understand something: Let's assume that i get dirty or blacklisted bitcoin from a P2P exchange Will it work if i mix the bitcoin to clean it and then cash it out using directly payeer bitcoin address for example to exchange it to USD? Will my payeer be caught or banned or seized, or can i exchange to monero for example and then transfer to another wallet to be converted to bitcoin again and only after send to payeer, The real problem is that P2P isn't very common in my country, but if for example paxful works, and i exchange dirty bitcoin into USD using P2P, what will likely ha ..read more

Your donation makes all the difference ..read more

I have 3 btc addresses and let's say each btc address has 1 bitcoin. If I want to transfer to my address from 3 btc addresses, I have to create 3 transactions and every time I have to pay a mining fee. Instead of that Can I transfer all the amount from 3 btc addresses to my btc address in a single transaction? How to manually create a transaction? I am using "pybitcointools" library. But It supports only to send coins to multiple addresses. Could anyone help me out in creating a single transaction manually using any library ..read more

I am going to connect OKX wallet in my bitcoin based game app and have one problem in getting native segwit address from okx wallet. I read their developer doc and there are two way to get address. https://www.okx.com/web3/build/docs/sdks/chains/bitcoin/provider const result = await okxwallet.bitcoin.connect() let accounts = await okxwallet.bitcoin.requestAccounts(); both return taproot address and I can't get native segwit and other types of address when user connect wallet ..read more

My idea is this. Every time I reset the password, the wallet contents will be called. How can I get these contents ..read more