Migrate supported Bitcoin testnet network to Testnet4 or Signet

[lumtis]

Describe the Issue

Bitcoin testnet3 might become deprecated and is not optimal for Bitcoin testing (chain much faster than mainnet)

This task is about finding alternative to Bitcoin testnet3 for testnet

We might want to move to Testnet4: https://mempool.space/testnet4

Blocked by #2728

We'll be adding Signet support as 1st step to provide a stable test network.

[ronaldoguedess]

Please prioritize this: nobody can test with Testnet3 anymore. Here's the link to claim the faucet for Testnet4.

Claim Faucet for Testnet4
https://coinfaucet.eu/en/btc-testnet4/

[lumtis]

We should definitely consider it.
It doesn't seem though btcd has completed support for testnet4: btcsuite/btcd#2187
We might need to consider forking btcd

[fadeev]

@ronaldoguedess #2386

[ronaldoguedess]

We should definitely consider it. It doesn't seem though btcd has completed support for testnet4: btcsuite/btcd#2187 We might need to consider forking btcd

Testnet4 might not be finalized yet, but it's performing 1000% better than Testnet3, which is now deprecated. This makes it the perfect time to add support for Testnet4.

[jcvernaleo]

Just so you know, someone is actively working on adding the current testnet4 to btcd now (not just that open issue that we haven't finished).

Hope to have it in within a few days.

[jcvernaleo]

I'd of course encourage contributing to btcd rather than forking. If you tag me in any PRs, I'll make sure to take a look at it sooner rather than later!