[bisq-network/bisq] Support setting one or more user-defined block explorers (#4371)

[chris-belcher]

I just saw this issue because my name was mentioned.

Having the users own blockchain explorer does preserve privacy, but it also decreases scalability by requiring way higher disk usage. User's cant prune (which adds about 300 GB requirement) plus they must have an extra database with an index containing every address that was ever used on the blockchain (about 100 GB depending).

A much better way to solve this problem of private address lookup is to start watching the address before it's ever used. The bitcoin network will tell you when new transactions for it arrive. IIRC bisq already connects to the bitcoin p2p network via bitcoinj, so it can monitor newly arriving transactions and blocks.

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