This article has not changed since Vitahash recorded it on the Base blockchain. Everything below can be checked without taking our word for any of it.
Stamp ID STAMP-2026-0915-FTKV2EV3 Content hash f0e34700fa63f1851627e3932724064a8e4b8314b71ab9c127aab0c107ceaf4c Articles recorded that day 9 Attestation UID 0x736e30d14213497219ae6c7039b354a5b9300b96a9f3cb6b892242a1ab4eced5 View on EAS Transaction 0x5636b4f32543f00d51d78228c9e4ec0aea3b72c65414dea4c9a52fad1e010cc4 View on Basescan Recorded on Base using canonicalization v1 and record format v1.
How this article reaches the blockchain It was combined with the other 8 articles published that day, one step at a time, until the whole day became a single value. That one value is what Vitahash wrote to the blockchain. Change a single character of this article and the starting value below changes, so none of the steps would land on the recorded one.
Starting value for this article 0x35da83a97073db5f8da92cb90a2bd4462d5e3e44ca84a177f09a70fdc13eb4d4 Built from this article's content hash and its stamp ID, as sha256(0x00 || sha256(utf8(stampId)) || contentHash).
Step 1, combined with the value before it 0x65a90853786338e3cccdc846bd6a14de78265fafbf3d88d39c417e4b9ea8a69d 0x629fbf8d6325b4d78c8d60f0b560b68f539c5068124dd214da4aa2b69eb708de This is the value for the whole day.
Value these steps arrive at 0x629fbf8d6325b4d78c8d60f0b560b68f539c5068124dd214da4aa2b69eb708de What the blockchain says Two values, reached two different ways. The one above was worked out from this article. The one below was read back from the record on Base.
Worked out from this article 0x629fbf8d6325b4d78c8d60f0b560b68f539c5068124dd214da4aa2b69eb708de They are the same value, so this article was published that day with exactly the text above.
Check it yourself Every number on this page came from Vitahash. Copy the article's exact text below and check it against the hash above, using any SHA-256 tool.
The exact text is not available for this article right now. The command below still reaches it.
1. Hash the article yourself This downloads the exact text Vitahash hashed, in the exact form it hashed it, and hashes it again on your machine. Nothing Vitahash wrote runs here.
curl -s "https://api.vitahash.org/api/verify/STAMP-2026-0915-FTKV2EV3/canonical" | shasum -a 256Should print f0e34700fa63f1851627e3932724064a8e4b8314b71ab9c127aab0c107ceaf4c
2. Build this article's starting value The stamp ID is folded in with the hash, so one article's record can never stand in for another's.
STAMP=STAMP-2026-0915-FTKV2EV3
CONTENT=f0e34700fa63f1851627e3932724064a8e4b8314b71ab9c127aab0c107ceaf4c
DIGEST=$(printf '%s' "$STAMP" | shasum -a 256 | cut -d' ' -f1)
printf '00%s%s' "$DIGEST" "$CONTENT" | xxd -r -p | shasum -a 256Should print 35da83a97073db5f8da92cb90a2bd4462d5e3e44ca84a177f09a70fdc13eb4d4
3. Combine step 1 The published value goes first, then the value you have.
printf '01%s%s' "65a90853786338e3cccdc846bd6a14de78265fafbf3d88d39c417e4b9ea8a69d" "35da83a97073db5f8da92cb90a2bd4462d5e3e44ca84a177f09a70fdc13eb4d4" | xxd -r -p | shasum -a 256Should print 629fbf8d6325b4d78c8d60f0b560b68f539c5068124dd214da4aa2b69eb708de
4. Compare with the blockchain The last value above is what the whole day came to. Read the record on Base and check its merkleRoot field is the same. Vitahash is not involved in this step at all.
https://base.easscan.org/attestation/view/0x736e30d14213497219ae6c7039b354a5b9300b96a9f3cb6b892242a1ab4eced5The rules these commands follow are written down in full, so anyone can reimplement them.
Read the specification