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-2026-0913-3PTP47QX Content hash 2d962a2643f503ff95795614751e9e247eb8671eb9c84d9e80571c40d9ed3ba2 Articles recorded that day 12 Attestation UID 0xe3d8bd2eb8f03a62049ad18692cb77891d5172e148e4d05da8c0caa3a3d19861 View on EAS Transaction 0x805d0579370308945e4cd9dcbcee7ba593bbae37a839bbee40333a5f4845cf0a 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 11 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 0x4104b11fda9d1c01bc316a99f22880481dfce36be2112c94bc67804846e17b90 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 0x8e3648f08123ead0f2208dd66e3deaaf0d169c578f41e38e5d93f6f0d2e64c45 0x9fd359cf554370f4d68be8d2d72dbb1c30a7e1ebc4ab240496d42aaae482bc1a Step 2, combined with the value before it 0x93e6b7be8d3dac139659027698adb5d3466b5e5adb8b31d62176d496d6f35e01 0x8d23c52490116aed9c6806c460a82c2867e0d8fa16cde80f349574b442de9011 Step 3, combined with the value before it 0x7a5d92dadcf9090e0ca98ca0332b44c973c20ce01f4370a0e1e7c59929bb124b 0xafe50b3f022867873ac74178a7f6d82f520d3161a2fc7d09780bd513b8ba39e3 This is the value for the whole day.
Value these steps arrive at 0xafe50b3f022867873ac74178a7f6d82f520d3161a2fc7d09780bd513b8ba39e3 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 0xafe50b3f022867873ac74178a7f6d82f520d3161a2fc7d09780bd513b8ba39e3 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-2026-0913-3PTP47QX/canonical" | shasum -a 256Should print 2d962a2643f503ff95795614751e9e247eb8671eb9c84d9e80571c40d9ed3ba2
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-2026-0913-3PTP47QX
CONTENT=2d962a2643f503ff95795614751e9e247eb8671eb9c84d9e80571c40d9ed3ba2
DIGEST=$(printf '%s' "$STAMP" | shasum -a 256 | cut -d' ' -f1)
printf '00%s%s' "$DIGEST" "$CONTENT" | xxd -r -p | shasum -a 256Should print 4104b11fda9d1c01bc316a99f22880481dfce36be2112c94bc67804846e17b90
3. Combine step 1 The published value goes first, then the value you have.
printf '01%s%s' "8e3648f08123ead0f2208dd66e3deaaf0d169c578f41e38e5d93f6f0d2e64c45" "4104b11fda9d1c01bc316a99f22880481dfce36be2112c94bc67804846e17b90" | xxd -r -p | shasum -a 256Should print 9fd359cf554370f4d68be8d2d72dbb1c30a7e1ebc4ab240496d42aaae482bc1a
4. Combine step 2 The published value goes first, then the value you have.
printf '01%s%s' "93e6b7be8d3dac139659027698adb5d3466b5e5adb8b31d62176d496d6f35e01" "9fd359cf554370f4d68be8d2d72dbb1c30a7e1ebc4ab240496d42aaae482bc1a" | xxd -r -p | shasum -a 256Should print 8d23c52490116aed9c6806c460a82c2867e0d8fa16cde80f349574b442de9011
5. Combine step 3 The published value goes first, then the value you have.
printf '01%s%s' "7a5d92dadcf9090e0ca98ca0332b44c973c20ce01f4370a0e1e7c59929bb124b" "8d23c52490116aed9c6806c460a82c2867e0d8fa16cde80f349574b442de9011" | xxd -r -p | shasum -a 256Should print afe50b3f022867873ac74178a7f6d82f520d3161a2fc7d09780bd513b8ba39e3
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/0xe3d8bd2eb8f03a62049ad18692cb77891d5172e148e4d05da8c0caa3a3d19861The rules these commands follow are written down in full, so anyone can reimplement them.
Read the specification