XRC HardFork - X11, DigiShield POW algo

[ghost]

Hello,
there was a new hardfork of XRC from block 136136 which changed algo of XRC from X13 to X11 and it is using now DigiShield POW Retarget every next block.

This pull request is there because of compatibility of Blockcore with this change.

Thank you for merge.

[dangershony]

Is this an urgent PR request?

[sondreb]

Looks good and thanks for the PR. There is a couple of things needed to be done:

• Re-add the old checkpoints.
• Provide a link to a statement or information from the XRC team/website regarding this hardfork, if available?

[ghost]

Is this an urgent PR request?

Yes, without that, blockcore node is incompatible for now.

[ghost]

Looks good and thanks for the PR. There is a couple of things needed to be done:

* Re-add the old checkpoints.

* Provide a link to a statement or information from the XRC team/website regarding this hardfork, if available?

1. Old checkpoints are back.

2. For example:
   https://twitter.com/MotorUp2/status/1523752003910119424?s=20&t=1UY_W7bjQu0Qiq-vmiD1_w
   https://twitter.com/MotorUp2/status/1523855657618788359?s=20&t=TTYwEODuHX44lxXKEzZtMg
   https://twitter.com/xrhodium_xrc
   https://www.xrhodium.org/
   

[ghost]

Thank you very much for merge :)

And one more comment. I tried to compile your blockcore node under Ubuntu and there is necessary to:

sudo apt update
sudo apt install -y libc-dev librocksdb-dev

\src\Node\Blockcore.Node
dotnet add package RocksDbSharp
dotnet add package RocksDbNative

Im not sure exactly what is necessary but it helped. Your node is working under Ubuntu 20.04 with this update.

Thanks for your work. :)

[sondreb]

Have run it and verified it works fine. Thanks for the changes after previous review.

[sondreb]

This has been released and updated on our public indexer and explorer: https://explorer.blockcore.net/xrc/explorer

Version 1.1.40 or higher of the multi-node is now compatible with the new consensus rules for XRC: https://github.com/block-core/blockcore-nodes/releases