Make initial block index loading faster

[psolstice]

PR intention

Speed up loading block index from disk.

Code changes brief

Code eliminates the check of PoW for all the block headers except last 10000.

Summary by CodeRabbit

• New Features
  • Introduced an option to enforce Proof of Work (PoW) verification for the last N blocks at startup, enhancing the security and integrity of the block index.
• Refactor
  • Updated block index checks handling for improved efficiency and flexibility.

[coderabbitai[bot]]

Walkthrough

The update introduces a flexible mechanism for checking the Proof of Work (PoW) of blockchain blocks during client startup. It adds an option to either perform a comprehensive PoW check for all blocks or limit the verification to the most recent ones, depending on a specified flag. This enhancement aims to improve startup efficiency without compromising the integrity of the blockchain.

Changes

Files	Change Summary
src/txdb.cpp, src/txdb.h	Updated to support conditional PoW checks for blocks on startup, based on the -fullblockindexcheck flag. Introduce constants for default behavior and the number of recent blocks to check.

🐰✨
In the realm of code, where blocks align,
A rabbit hopped, making blockchain refine.
"Let's check the work, but wisely so,
For not all blocks need our thorough glow.
With a flag to guide, we hop with ease,
Ensuring integrity, in the digital breeze."
🌟🐾

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