Writing receipt

How this was written

Mostly typed

By P.T. · Fri, 17 Jul 2026 09:50:06 GMT

Ed25519 signature verified against the ByHuman public key.

Published post

This receipt covers a post published on X. The text itself is not stored. Only its SHA-256 hash is stored. View the post on X

Observed writing process

Typed: 96%
Pasted: 0%
Paste events: 1
Duration: 17s

The verdict reflects the provenance of the text that survived to approval. ByHuman records observed input behavior in the editor. It does not prove real-world authorship.

On-chain anchor

Anchored

A digest of this receipt was anchored on Arbitrum Sepolia at Fri, 17 Jul 2026 09:50:06 GMT.

Transaction: 0xe3136b0a2a5881086143a0574f863bda631d653b39cf2d691b5c8dec7f098827
Digest (keccak256): 0x8ef12af9c1850d855b7854774a0d09455c48519ea52df166be43fb65f706111f
Contract: 0xAaef72F5e32a238A2C91D04AB72BB7f1A2c22CD6

Verify independently (no byhuman.ink required)

Anyone holding the receipt JSON can confirm this digest is on chain without trusting byhuman.ink.

Compute the digest from the receipt: keccak256(canonicalize(receipt)). It should match the digest shown above.

Read the on-chain timestamp from the contract:

cast call 0xAaef72F5e32a238A2C91D04AB72BB7f1A2c22CD6 \
  "anchoredAt(bytes32)(uint256)" 0x8ef12af9c1850d855b7854774a0d09455c48519ea52df166be43fb65f706111f \
  --rpc-url https://sepolia-rollup.arbitrum.io/rpc

A non-zero unix timestamp proves the receipt existed on Arbitrum Sepolia by that block.

canonicalize uses RFC 8785 JSON canonicalization. The contract address and network details above are the inputs needed for the independent on-chain check.

Receipt

Stamp code BGXSSK is bound to this receipt.

Proof: https://x.com/i/web/status/2078054626801160457. A stamp on any other post with this code is fake.

Post ID: 468bdc24-dc27-4d9f-8f8b-a01c05aa001b
Text SHA-256: 0415231896422e44b5eacc30c87771c2c3b7d3221086f932990d77d728a92ed6
Signature: 2ZQxpQVA7gb8AtE0uOi7fdRtrjvxMb5mecHmdubD+S5zBBo692BMbIEx31qCffqee0tZOLS14CX115xdq5lFDA==
Created: 2026-07-17T09:50:06.540Z

Verify this independently on the verify page against the published public key.