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Bitcoin Core supports creating a custom signet and mining utility for setting up a public test network with alternative functionality. This is not meant to be used to create an altcoin with actual or perceived monetary value as I (and many others) would recommend using a sidechain rather than attempting to start a new currency.
Right now, I manage to run ...
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I advise you just to rely on https://github.com/dgarage/NBXplorer/
This is an API more flexible and more stable than Bitcoin Core to manage HD wallets. There is a C# client, and it integrate nicely with NBitcoin.
You can create PSBTs from it, ready to sign with NBitcoin. (Disclaimer: I am the main maintainer for both NBitcoin and NBXplorer)
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You set the fee rate to 6 sat/vbyte. That's very low, median fee in recent blocks has been 30-70 sat/vbyte. See mempool.space.
You could wait until the weekend when the mining difficulty is expected to drop by more than 25%. This will decrease fees as more blocks can be mined per hour. The difficulty drop happens around 1AM UTC on Saturday.
Alternatively, ...
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One of the problems of Java is the verbosity of the language. However, it is also true that the life of the language it is very old in these that.
I fall into the problem to talk with the bitcoin rpc interface for one of my side projects on c-lightning and I was not able to find a clean library that is able to talk also with other rpc interfaces derived from ...
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