Run your investment club on controls, not on a spreadsheet.
Every contribution follows the same path: submitted with proof, reviewed by an administrator, confirmed by the treasurer, then posted permanently to the ledger.
Proof on every payment
Members upload proof of payment with each contribution. Nothing enters the ledger on a promise.
Two independent approvals
An administrator reviews the submission; the treasurer separately confirms the money in the bank account.
Immutable ledger
Posted transactions cannot be edited or deleted. Corrections are made through visible reversals.
Live ownership
Each member's percentage share and share value update as contributions post and the portfolio moves.