Write from the start. Read a year later.
Early sobriety is full of counting: days, hours, sometimes minutes. Here is a different use for the counting. Write a letter now, in the thick of it, to the person who has a year. Tell them what it cost this week, and what you are doing it for.
The letter is encrypted in your browser before upload and scheduled to open one year after confirmed sealing. Keep its private key link safe. The service holds encrypted content and handles the key transiently for email and ownership checks; this is not a promise that the service could never decrypt it.
Encrypted in your browser. Scheduled to open one year after verified sealing; pairs need verified payment and both letters written first. Keep your private key link safe. US$5 for one letter, US$9 for two.