Unified Address Format: Review & Update Sidecar code accordingly

[Imod7]

Description of Upcoming Change

WFC Unifying Polkadot Ecosystem Address Format was voted which means that the ss58 representation of addresses will be unified as described in this forum post section.

Relevant Resources

• Unified Address Format
• Unified Address Format - Integration Guide

Sidecar Checks & Possible Updates

We need to review and update (if necessary) Sidecar's codebase to ensure compatibility with the new address format. From a first check, we would need to:

• Review that addresses in endpoint responses are in the expected format, e.g. blocks endpoint (example) > under extrinsics > events > e.g. 5 > data > there is an address: no ss58 representation since here we call fetchEvents which calls query.system.events()
• Review validateAddress function
  • this function is called by all endpoints where the user can give an address (in ss58 format or in hex) as a parameter, e.g. /accounts/:address/staking-info
  • this should work fine as long as base58Decode and checkAddressChecksum from polkadot-js/common repo are also working as expected. Check those functions.
• Update validateAddress > allNetworks code
  • allnetworks is imported from util-crypto to obtain the network in which this address belongs to.
  • allnetworks in util crypto is using knownSubstrate
  • which is fetching the network from ss58-registry which will become obsolete.
• Review & update the tests where the chain defined based on the ss58Prefix.
• Review the mocked registries in all tests.

cc: @IkerAlus @TarikGul