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-2026-0909-ECYY6IZ5 Content hash 0d06271ee0e426fda7eb3190b6604eeb72b7e76c9b7ea19655d378cdfe3c522a Articles recorded that day 8 Attestation UID 0xf8f0e64849d3ba6f01e8709c90250a8b400b96bd9576e39e7949fa6c0043408b View on EAS Transaction 0x74e43b2e9ba0b4a17a30a17cd69341ab9f4af4cebcdb4747b7188b0b5e486d70 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 7 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 0xace73c01282d5c7e75e22f22ec5e00c7e7bc3cd1d6308873e6acdfc86110c3ec 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 0x74331513c6b2a5e970c8b9c61015e61bfe3944d50c7b1c04635867c15f6227e5 0xba5abf707a3ee17f523cce0d326b54088c6a200875a298689627fdd34919f3c6 Step 2, combined with the value after it 0xff7361b8ea4c7423a94d7582b2d8997810fe4826531bda8b0d731e7ac843006c 0x97af53e90c4e942303167c11b3028a112931ba0b2216464cdd9d2eafcea2a2a1 Step 3, combined with the value after it 0x017a0ea40754398dd234718206ec2e41b1a8edbba60ed294acb0d81580cdbd00 0xb7d6c53003650ad4e6f8678e2531b950631a1d481cd3edde23566d77738d5048 This is the value for the whole day.
Value these steps arrive at 0xb7d6c53003650ad4e6f8678e2531b950631a1d481cd3edde23566d77738d5048 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 0xb7d6c53003650ad4e6f8678e2531b950631a1d481cd3edde23566d77738d5048 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-2026-0909-ECYY6IZ5/canonical" | shasum -a 256Should print 0d06271ee0e426fda7eb3190b6604eeb72b7e76c9b7ea19655d378cdfe3c522a
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-2026-0909-ECYY6IZ5
CONTENT=0d06271ee0e426fda7eb3190b6604eeb72b7e76c9b7ea19655d378cdfe3c522a
DIGEST=$(printf '%s' "$STAMP" | shasum -a 256 | cut -d' ' -f1)
printf '00%s%s' "$DIGEST" "$CONTENT" | xxd -r -p | shasum -a 256Should print ace73c01282d5c7e75e22f22ec5e00c7e7bc3cd1d6308873e6acdfc86110c3ec
3. Combine step 1 The published value goes first, then the value you have.
printf '01%s%s' "74331513c6b2a5e970c8b9c61015e61bfe3944d50c7b1c04635867c15f6227e5" "ace73c01282d5c7e75e22f22ec5e00c7e7bc3cd1d6308873e6acdfc86110c3ec" | xxd -r -p | shasum -a 256Should print ba5abf707a3ee17f523cce0d326b54088c6a200875a298689627fdd34919f3c6
4. Combine step 2 The value you have goes first, then the published value.
printf '01%s%s' "ba5abf707a3ee17f523cce0d326b54088c6a200875a298689627fdd34919f3c6" "ff7361b8ea4c7423a94d7582b2d8997810fe4826531bda8b0d731e7ac843006c" | xxd -r -p | shasum -a 256Should print 97af53e90c4e942303167c11b3028a112931ba0b2216464cdd9d2eafcea2a2a1
5. Combine step 3 The value you have goes first, then the published value.
printf '01%s%s' "97af53e90c4e942303167c11b3028a112931ba0b2216464cdd9d2eafcea2a2a1" "017a0ea40754398dd234718206ec2e41b1a8edbba60ed294acb0d81580cdbd00" | xxd -r -p | shasum -a 256Should print b7d6c53003650ad4e6f8678e2531b950631a1d481cd3edde23566d77738d5048
6. 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/0xf8f0e64849d3ba6f01e8709c90250a8b400b96bd9576e39e7949fa6c0043408bThe rules these commands follow are written down in full, so anyone can reimplement them.
Read the specification