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validation: assumeutxo params for testnet and signet

Placeholder Sjors Provoost requested to merge github/fork/Sjors/2023/09/assume_testnet_signet into master

Based on #27596. This adds snapshot parameters for testnet block 2,500,000 and signet block 160,000.

You can generate the snapshots yourself using ./contrib/devtools/utxo_snapshot.sh or download my torrent:

  • testnet: magnet:?xt=urn:btih:511e09f4bf853aefab00de5c070b1e031f0ecbe9&dn=utxo-testnet-2500000.dat&tr=udp%3A%2F%2Ftracker.bitcoin.sprovoost.nl%3A6969
  • signet: magnet:?xt=urn:btih:9da986cb27b3980ea7fd06b21e199b148d486880&dn=utxo-signet-160000.dat&tr=udp%3A%2F%2Ftracker.bitcoin.sprovoost.nl%3A6969

It would be a good idea to test:

  1. That you can produce the same snapshot files, sha256 sums:
eeeca845385ba91e84ef58c09d38f98f246a24feadaad57fe1e5874f3f92ef8c utxo-signet-160000.dat
79db4b025448cc0ac388d8589a28eab02de53055d181e34eb47391717aa16388 utxo-testnet-2500000.dat
  1. That the snapshots work

Not part of this PR:

I also have a branch with a mainnet snapshot at height 800,000. It can be used for testing, but I'm not proposing it for merge just yet. I think more testing and conceptual discussion should happen first.

  • branch: 2023/09/assume_mainnet
  • torrent: magnet:?xt=urn:btih:50ee955bef37f5ec3e5b0df4cf0288af3d715a2e&dn=utxo-800000.dat&tr=udp%3A%2F%2Ftracker.bitcoin.sprovoost.nl%3A6969

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