Block Validation: New Checks

[kalouo]

1643

Overview

Adds more stateless validation logic to the /block.validate endpoint.

• No duplicate inputs in a block.
• Number of transactions within accepted range.
• Fee transactions comes after all other transactions.
• One fee transaction per currency.

Changes

Logic in block_validator.ex and tests in block_validator_test.exs

Testing

mix test test/omg_watcher/block_validator_test.exs

[kalouo]

Updated the documentation to reflect new checks.