Use hexadecimal strings instead of base64 business hash strings in the oracle module

[kevin-yuhh]

Summary

The base64 business hash strings is not friendly to frontend, should be changed to hexadecimal strings

Problem Definition

A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]

Why do we need this feature?

What problems may be addressed by introducing this feature?

What benefits does the chain stand to gain by including this feature?

Are there any disadvantages of including this feature?

Proposal

A clear and concise description of the solution you'd like (what you want to happen).

Alternatives

A clear and concise description of any alternative solutions or features you've considered.

Additional context

Add any other context or screenshots about the feature request here.

---

For Admin Use

• [ ] Not duplicate issue
• [ ] Appropriate labels applied
• [ ] Appropriate contributors tagged