Adjusting Prune value is possible?

[LoyceV]

If you want to run two Core instances, one for Mainnet and another for Testnet3 or Testnet4, you have to setup both Core to use separate ports or the Core started as second one will complain that some port is already in use.

Bitcoin Core on testnet uses a different port than mainnet by default:

Code:

grep -a port .bitcoin/debug.log 
2025-08-08T08:40:40Z Binding RPC on address ::1 port 8332
2025-08-08T08:40:40Z Binding RPC on address 127.0.0.1 port 8332

grep -a port .bitcoin/testnet4/debug.log 
2025-08-05T12:39:34Z Binding RPC on address ::1 port 48332
2025-08-05T12:39:34Z Binding RPC on address 127.0.0.1 port 48332

I didn't change any settings for this

[nc50lc]

A brief instruction can be helpful.

That one command Loyce has provided before your reply is all you need.
Everything that could conflict are already pre-configured to use separate/different values by default.

For more simpler guide (if you're on Windows), check this thread in 'Beginners & Help' board: /index.php?topic=5215716.0#post_actsteps
Note: --testnet is for "testnet3", --testnet4 is for the latest testnet, there's also --regtest for other tests that can be done locally.

[LucyFurr]

A brief instruction can be helpful.

That one command Loyce has provided before your reply is all you need.
Everything that could conflict are already pre-configured to use separate/different values by default.

For more simpler guide (if you're on Windows), check this thread in 'Beginners & Help' board: /index.php?topic=5215716.0#post_actsteps
Note: --testnet is for "testnet3", --testnet4 is for the latest testnet, there's also --regtest for other tests that can be done locally.

And finally, I did it today.

Code:

{
  "chain": "testnet4",
  "blocks": 0,
  "headers": 0,
  "bestblockhash": "00000000da84f2bafbbc53dee25a72ae507ff4914b867c565be350b0da8bf043",
  "bits": "1d00ffff",
  "target": "00000000ffff0000000000000000000000000000000000000000000000000000",
  "difficulty": 1,
  "time": 1714777860,
  "mediantime": 1714777860,
  "verificationprogress": 3.93201064047899e-08,
  "initialblockdownload": true,
  "chainwork": "0000000000000000000000000000000000000000000000000000000100010001",
  "size_on_disk": 269,
  "pruned": false,
  "warnings": [
  ]
}

It started with 1 year 14 weeks behind, hope I am doing it the right way.

[LoyceV]

It started with 1 year 14 weeks behind, hope I am doing it the right way.

That sounds about right, testnet4 is not very old yet (so syncing is much faster).

[LucyFurr]

It started with 1 year 14 weeks behind, hope I am doing it the right way.

That sounds about right, testnet4 is not very old yet (so syncing is much faster).

It took no more than 2 hours for the sync and now the wallet is ready. I will use the mentioned thread to get some tbtc.

Code:

{
  "chain": "testnet4",
  "blocks": 97611,
  "headers": 97611,
  "bestblockhash": "0000000011e5f53d1f0af01d675fb051e3e34d5c4415d59de899f869d49332c1",
  "bits": "1d00ffff",
  "target": "00000000ffff0000000000000000000000000000000000000000000000000000",
  "difficulty": 1,
  "time": 1755454851,
  "mediantime": 1755451248,
  "verificationprogress": 1,
  "initialblockdownload": false,
  "chainwork": "00000000000000000000000000000000000000000000046e477de3bfe4feccf4",
  "size_on_disk": 8070687148,
  "pruned": false,
  "warnings": [
  ]
}