[NayNay] Signing Fix: Message too long error

[rh0delta]

Related Issue(s)

• Resolves #411

Proposed Changes

• update picking validators to use BigInt instead of regular parseInt

Testing

• [ ] Unit tests added/updated
• [ ] Integration tests added/updated
• [x] Manual testing performed

Screenshots (if applicable)

Additional Context

Checklist

• [x] I have performed a self-review of my code.
• [x] I have commented my code.
• [ ] I have updated documentation, where necessary.

[frankiebee]

where the tests at?

[rh0delta]

@frankiebee Ive updated the index calc, and added tests. Ready for re-review!