Adopt latest Bitcoin bootstrap generation code and customise for Crown
**As an impatient user, I want to be able to speed up initial blockchain sync by the use of a bootstrap.
Adopt latest Bitcoin bootstrap generation ("linearize") code and customise for Crown.
- Grab the latest linearize code from Bitcoin
- Customise for Crown
- Code Review
Definition of done/Acceptance criteria
- Ready for production after QA check.
How to demo
Create a bootstrap.dat and sync an instance from it.