Canister Guide
Write a letter to your child that waits for the right day
Whether they are five or fifteen, you can seal guidance, stories, and love in a capsule that unlocks when they are ready to receive it.
Messages that outlast a chat thread
Group chats disappear into scrollback. Cloud notes lack ceremony. A letter to your child in Canister is a deliberate act: encrypted on your device, anchored on-chain, and released on a date you control.
Parents use Canister for first-day-of-school notes, birthday letters, or longer reflections meant for adulthood.
Age-appropriate planning
For younger children, you might unlock on a 13th or 18th birthday. For teens, graduation or moving out are popular dates. Essential tier works for a short message up to one year out; Legacy supports horizons up to 50 years for generational letters.
Built for family legacy
Canister complements — not replaces — everyday conversation. It is for the words you want preserved with tamper-evident controls: AES-256-GCM encryption, Internet Computer storage, and one-time pricing per capsule.
Common questions
At what age should I write a letter to my child?
There is no wrong time. Many parents write early and set unlock dates for teenage or adult milestones. You can always create additional capsules as your child grows.
Can a co-parent or guardian access the letter?
You control who receives the access key. Share it with a co-parent or keep it in your estate plan if the unlock date is far in the future.
Is there a free option for a short letter?
Yes. Essential is free for a message up to 200 characters with up to a one-year unlock horizon — a good way to try the experience before upgrading for files or longer dates.