Witness Required
HTTP 402 is Payment Required. This service adds the missing sibling: pay through the x402 standard to have a reasoning claim stamped as a morpheme — h(R‖I‖O‖M) — onto a fee-bearing Hedera Consensus Service topic. On the native lane, the payment and the testimony are the same transaction. The receipt is the product.
The price list
The flow
Verify a stamp
What does this do?
Every stamp on our topics gets a timestamp from the Hedera network. Think of it like a wax seal with the exact moment pressed into it, down to the billionth of a second. That timestamp is the receipt.
Paste one in the box and hit verify. We ask the public network, not our own server, to hand back the message sealed at that moment, and we check it in front of you: this proof exists, here is its hash, here is who paid to stamp it. You never have to trust us. The network answers.
Where do I find a timestamp?
Open the wall and pick any tile. Each one is a stamped proof. Copy its consensus timestamp and paste it here. Or click a tile's HashScan link and copy the timestamp from there. Better yet: stamp your own proof, then come back and verify it yourself.