What's the simplest way to test and verify that I am the owner of the fund except sending a real coin? For legacy address, I think i can verify with signing/verifying message, is this simplest? But what can i do for the SegWit address ..read more

Can litecoin transaction to be send to bitcoin blockchain(to be sent to bitcoin address)using lighting network ..read more

One possible optimization to compress bitcoin transaction size is avoiding repetition of redundant data between inputs. As a consensus change, a new transaction type could allow signing a list of txid:vout pairs if they all share the same output script. To pick an extreme example, there are 1.6 million outputs with script 1HckjUpRGcrrRAtFaaCAUaGjsPx9oYmLaZ. Spending one of these P2PKH outputs costs 40+72 vBytes (prevOut + scriptSig) per input. By aggregating the scriptSig across inputs, the transaction could omit 72 per input and only include it once per transaction. When consolidating all the ..read more

I requested a withdraw for some funds to my wallet but customer service keep telling me that its going to take awhile for it to be processed because I'm not top tier members. It's been three days now and still nothing, should I be worried ..read more

What is a simple explanation of CScriptNum, the number encoding used by arithmetic opcodes in Bitcoin Script? What would an illustrative pseudocode/python example look like? What should the encoding of the following integers be (in hexadecimal)? 42 88 257 17000 8589934592 When is it not 4 bytes? See Also: Why are arithmetic script opcodes limited to 4 byte operands? Arithmetic operations in Bitcoin (OP_ADD, etc) Compact integer in Scripts ..read more

I test PSBT in my wallet today, create a transaction in Bitcoin Core, click "send" and "create unsigned", then "Load PSBT from ..." from menu, error shows: Unable to decode PSBT Unsigned tx does not have empty scriptSigs and scriptWitnesses.: unspecified iostream_category error decodepsbt and analyzepsbt show the same error too: TX decode failed Unsigned tx does not have empty scriptSigs and scriptWitnesses.: unspecified iostream_category error (code -22) I have no ideal what happened. But same procedure works fine in another wallet of testnet. Both wallets are not watch-only. Besides, I ..read more

how do I find out if I have a bitcoin wallet. I have been contacted by a company who say I have a wallet but I did not buy bitcoin ..read more

The exchange requests the beneficiary's VASP. What to indicate ..read more

After searching for libraries that could do this, and/or code that could do this, all around the internet, and also AI code assistants failing me, I have managed to write C code (not C++, simple C) that generates a valid Bitcoin message signature! I used to code in C 30 years ago, so my code may not be the best, and I share it here in case one of you knows of a good library that does it all, as my next steps will be verifying a signature, preparing and posting transactions, etc. Here is what I have done: Compile with (assuming you have all the libs in your path): gcc btcsign.c -o btcsign -lse ..read more

I still have a private key from an old Bitcoin wallet (circa 2012), and I have a private key. I downloaded the bitWallet app for iOS, entered my private key there and my wallet with balance and all transactions was displayed. I wanted to transfer bitcoins to my new wallet, but I get the following error: mandatory-script-verify-flag-failed (Public key is neither compressed or uncompressed) My secret key is 52 characters long, starts with 5HpH…. Step 1: in the bitWallet (iOS) application I insert the private key, and it automatically calculates the correct address. Step 2: I click “save” and s ..read more