Blockspace, delivered.
Reserve room in a future Bitcoin block. Your transaction stays private until it's mined, pays no fee, and is proven on-chain.
- 921,404
- 921,405
- 921,406
- 921,407
- 921,408
- 921,409
- 921,410
- 921,411Reserved · 4,000 WU
- 921,412
Demo · mock data
Private
Never broadcast. Your transaction goes straight into the block template and becomes public only when the block is mined.
Reserved
Space is contracted in advance, not bid for in the fee market. Delivered transactions pay no fee.
Your keys
You sign. CORSA never holds a key.
Verifiable
Delivery is proven on-chain and checkable on any block explorer.
Compete for space vs. contract for it
- —Fee auction against every other sender
- —Visible to everyone before confirmation
- —No guarantee of which block, or when
- +Reserved weight units, contracted in advance
- +Private until the block is mined
- +A defined delivery window by block height
- +On-chain proof of delivery
How a transaction reaches a block
- 01
Sign
In your wallet
- 02
Submit
Against a contract
- 03
Validate
Accepted or rejected with a reason
- 04
Stage
Held privately until the window
- 05
Mine
In the block template
- 06
Prove
txid + block + coinbase
Everything that can be refused is refused at step 3, never at mining time.
Built for transactions that need a window
Data anchoring & timestamping
Commit hashes to Bitcoin in a known block window.
Inscriptions & data outputs
Publish data without exposure to fee spikes.
Treasury & settlement
Transactions that need a guaranteed delivery window.
Consolidations
Combine outputs on your schedule, at a contracted size.
Block capacity as a forward contract.
Lock in future blockspace at a known price, with physical delivery: a real transaction in a real block. Learn more