How it works
A contract for space in a future block.
Contract terms
What you reserve
| Allocation | Weight units (WU) reserved for you |
|---|---|
| Transactions | How many transactions the allocation may be split across |
| Delivery window | Block height range in which delivery happens |
| Data | Arbitrary, carried in data outputs |
| Fee | None |
Building the transaction
Two ways to build it
Option A
You build and sign
Submit a finalized PSBT or a signed transaction. PSBT is preferred because it proves the transaction carries zero fee.
Option B
We compose, you sign
Send your data and addresses. Receive an unsigned PSBT, sign it in your wallet, and return it.
Don't broadcast it
Broadcasting makes the transaction public and breaks the private delivery.
Don't spend the input before delivery
Spending the input invalidates the staged transaction.
Submission lifecycle
From accepted to delivered
accepted
queued
mining
delivered
failed
displaced ↺
An event, not a state: the submission returns to accepted.FAQ