First Coin · How it works
Nothing hidden — here's the whole calculation
First Coin asks for no account and stores none of your numbers. Every result comes from three values you type and the open assumptions below.
The math
- Remaining = goal − money already saved (never below zero).
- Days needed = remaining ÷ daily set-aside, rounded up so the last partial day is always covered.
- Reach date = start date + days needed (computed in UTC, so it never drifts across time zones).
- Milestones mark the days you cross 25%, 50%, 75%, and 100% of the goal.
Open assumptions
- No interest. Interest rate is 0. Every coin counts only as itself — a conservative promise, never an over-promise.
- Same amount every day. Cadence is daily; a week is 7 days and a month averages 30.4375 days.
- No account, no personal data. The result depends only on the numbers you type.
Why the ledger is trustworthy
$ each milestone is hashed with SHA-256link = sha256(prevHash | pct | amount | date)changing any milestone breaks every link after itstatus: tamper-evident, zero personal data
Credit, step by step
- 1
Save the same day each week
Consistency is the record. A steady set-aside is the first proof you can be counted on.
- 2
Keep a simple ledger others can vouch for
A savings group or a written log that a trusted person co-signs builds a reputation banks can later recognize.
- 3
Pay every small obligation on time
Rent, utilities, a phone plan — paid on time, every time. On-time history is the heart of a credit score.
- 4
Ask to be an authorized user
A family member with good standing can add you to their account. Their on-time history can start helping yours.
- 5
Open a secured card when ready
A small deposit becomes your limit. Used lightly and paid in full, it builds a real, reportable credit file.