The wall
for later.
Pick a network. If its communal wall has never been opened, one connected visitor can deploy it for everyone—at a deterministic address the dapp always knows.
A note worth waiting for.
Public onchain message0/280 bytes
Postcards are public blockchain data. The interface hides the message until its date, but this is not encryption. Never include secrets.
From then, to now.
The archive begins when the shared wall is deployed.