> Seal a box <
Your address goes into the envelope, and the envelope is sealed.
A unified address with an Orchard receiver, or a Sapling address. A transparent address is refused: it would be a public payout, which is the one thing this is not.
You sign a sentence, not a transaction: it costs nothing and moves nothing. Signing again with another address moves your box to it, and the box keeps its number.
> Boxes sealed 0 <