3

There are lot of things you can learn and try from below link including designing complex bitcoin scripts: https://github.com/BlockchainCommons/Learning-Bitcoin-from-the-Command-Line


3

Yes, bcoin: http://bcoin.io/ https://github.com/bcoin-org/bcoin bcoin is a modular Bitcoin library for nodejs with full node and SPV node functionality, as well as a scalable BIP44 wallet used in production by several Bitcoin businesses including Purse.io. Bcoin has the second-fastest initial sync time out of all available full node implementations (after ...


2

No, not all passphrases are used to generate the private keys for a wallet. Only specifically brain wallets do that. Passphrases in actual wallet software like Bitcoin Core and Electrum are used to encrypt the wallet. The private keys are still randomly and securely generated. Your passphrase is only used as an encryption key so that the private keys are ...


2

The bytes you would put in the block header would be, in order: 0x00 0x00 0x00 0x20. That's how the number 221 (= 0x20000000) is stored in 32-bit little endian encoding. Note that this is actually a large number; that range is used for BIP9-compatible versions. Older blocks that use versions 1 through 4 predate BIP9.


1

Addresses for outbound connections are largely chosen at random. The filtering of addresses comes at the time the addresses are first received by the node before they are added to the address database. This filter checks what services the nodes offer, what network they are on (e.g. IPv4, IPv6, TOR), and the time that they were reported to last be seen. Your ...


1

Unfortunately, the method used to generate new keys at the time was to generate them randomly and store them in the wallet.dat file. So if you don't have a backup of the file after the address was used, it is not guaranteed that your backups will have the necessary key. I would suggesting dumping the wallet.dat file to see all the private keys contained ...


1

I personally like Blockstream Green as in addition to being simple to use, it has many features about security and privacy


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