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The bitcoin p2p protocol does not directly permit transaction lookups this way. Maybe some bloom filtering would minimize the footprint, but it's still relatively complex to implement. Electrum servers are maybe the next best thing - they do support the lookups you want, but they're less decentralized, and if your application is doing naughty things they ...


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1) Which secure full node wallet implementations exist? Currently I just know of bitcoin core. Is there not any other one with a GUI? I don't know of any others, apart from forks of Bitcoin Core like Knots. See https://bitcoin.org for an overview of various types of wallet software. 2) Can you use a Ledger device with those full node wallets? Yes, ...


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It looks like you have your block hashes in the wrong byte order. You have them in the display byte order, but the network actually handles block hashes in the reverse byte order, the zeroes are at the end. I think the blocks that you are getting in response are going to be the first 500 blocks of the blockchain as well. So what's happening is that a node ...


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At this time, bcoin requires nodejs version 10.0 or greater.


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You are right, and it seems this answer is outdated. The concept of a UTXO set is more recent than Bitcoin itself. The original software kept a database with information on every transaction output ever created, including whether it was already spent. In that setting, the UTXO set was only defined implicitly by the spentness information in that database. ...


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