Piers Shepperson

Inspired by https://github.com/ethereum/go-ethereum/pull/19971/files replace bigCache with fastCache.

Add Solidity libary function to get ed25519 address mapped to secp256k1 address

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- [ ] I added unit tests for any code that added - [ ] I updated the CHANGELOG.md - [x] All IP is original and not copied from another...

Unit test multi-writer app store

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- [x] I added unit tests for any code that added - [ ] I updated the CHANGELOG.md - [x] All IP is original and not copied from another source...