code design

(-)ABBCC

• A(main category) - any code in evm-tx-engine is different. (-)A refers to the main category of the code: task status / chain transaction status / error code / ...
• BB(sub category) - the subcategory of the code, indicating the meaning of the code. The first B could be used to group sub categories
• CC(specific description) - the specific description of the code, telling the detail of the code

main category

• 8: transaction status
• 9: task status