| Solution | Length | |
|---|---|---|
| 3 letters | ||
| otp | 3 | |
| tfa | 3 | |
| 4 letters | ||
| seal | 4 | |
| iris | 4 | |
| visa | 4 | |
| 5 letters | ||
| tacit | 5 | |
| proof | 5 | |
| stamp | 5 | |
| 6 letters | ||
| signet | 6 | |
| 7 letters | ||
| warrant | 7 | |
| support | 7 | |
| 8 letters | ||
| sanction | 8 | |
| unsigned | 8 | |
| 9 letters | ||
| testimony | 9 | |
| signature | 9 | |
| hallmarks | 9 | |
| 12 letters | ||
| RATIFICATION | 12 | |
| RUBBER STAMP | 12 | |
| verification | 12 | |
| subscription | 12 | |
| 13 letters | ||
| reinforcement | 13 | |
| strengthening | 13 | |