Coin check

Ask what a Bitcoin script holds, and check the answer against a Hazync proof on this device.

The server supplies the proof and the facts. This page verifies the proof and checks each fact against it, and that it is about the script you asked, so a wrong answer from the server is refused, not shown. More about zAPPs.

The proof

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Output script (scriptPubKey, hex. The earliest blocks pay to public keys directly, so these examples are keys, not addresses.)

Why block 9's key has been paid several coins: its one 50 BTC coinbase was spent in block 170 (10 to Hal, 40 back to the same key as change), and the change was spent again in blocks 181 (10 out, 30 back), 182 (1 out, 29 back) and 183 (1 out, 28 back), and again later. History lists every coin the key was ever paid; the balance is what is left at the proof's height, which moves up as the board proves more of the chain.

What the proof can and cannot say: it shows the chain up to its tip is valid Bitcoin from genesis and what the coin state is there. This page does not check that the tip is the network's block at that height: compare the tip hash with a node or block explorer you trust. Below Bitcoin Core's minimum chain work the verdict is DEMO, as here.