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-2026-0919-C4XAOKT7 Content hash 6db8f7ce7a431bf3635345f56fd3451ae6d610f32cb64ee1ca91984827ba4303 Articles recorded that day 18 Attestation UID 0x1ed0b640723183fed258fb97c6562ff95da0496d1406e14653e12c062865f9d3 View on EAS Transaction 0x7b9fdc49a1760db010f3985639be208da0d433b5b3f9fa84e64abdaa135d36d6 View on Basescan Recorded on Base using canonicalization v2 and record format v1.
How this article reaches the blockchain It was combined with the other 17 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 0xc05877d7a89aac115aeffb87c0d18067c341727044f9bc86041c996bca160038 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 0xd7be9b8383eb854c477fe4a418b78ecb6b9440708f3c0eb96bd4c8f9908f9526 0x421e392372d4588dc2664b86c7d7711015c5a8fba6fb8e85c5db4c8aa87df7b4 Step 2, combined with the value before it 0x33d876ce028d85994e6db2b47b82058994c502000eb094575bddbbc68446f017 0x2abce3bdcef46a191b69fe46ed402e03352e5918eafe3b9b2d3824390dee8257 Step 3, combined with the value after it 0xe9e349cbb7ad5b29c9d5c2e26eb529e8788d41583dafcfda1104d2236fc37874 0x6ddc36faf65fa6578b988653de332a1f027710b88843c4a0b1ff15f7b542a8ed Step 4, combined with the value after it 0x88ae246968a8ec7aa1f6b0bda6d083ecc19de338136c0c6a5e32a081fd1fe6b3 0x55efe9c5ee1a98cc9194ca6df5c4bf2a9a53b4e50d9ad3ea34bf27437915d567 Step 5, combined with the value after it 0x2544de35a4de67f9861a894e1a2eed77c03547acb509e6b8af67a233143738ac 0x604c8251ec88e064e22355a066f4db7fea15afe24d6ee73fac3f907cdf446997 This is the value for the whole day.
Value these steps arrive at 0x604c8251ec88e064e22355a066f4db7fea15afe24d6ee73fac3f907cdf446997 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 0x604c8251ec88e064e22355a066f4db7fea15afe24d6ee73fac3f907cdf446997 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-2026-0919-C4XAOKT7/canonical" | shasum -a 256Should print 6db8f7ce7a431bf3635345f56fd3451ae6d610f32cb64ee1ca91984827ba4303
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-2026-0919-C4XAOKT7
CONTENT=6db8f7ce7a431bf3635345f56fd3451ae6d610f32cb64ee1ca91984827ba4303
DIGEST=$(printf '%s' "$STAMP" | shasum -a 256 | cut -d' ' -f1)
printf '00%s%s' "$DIGEST" "$CONTENT" | xxd -r -p | shasum -a 256Should print c05877d7a89aac115aeffb87c0d18067c341727044f9bc86041c996bca160038
3. Combine step 1 The published value goes first, then the value you have.
printf '01%s%s' "d7be9b8383eb854c477fe4a418b78ecb6b9440708f3c0eb96bd4c8f9908f9526" "c05877d7a89aac115aeffb87c0d18067c341727044f9bc86041c996bca160038" | xxd -r -p | shasum -a 256Should print 421e392372d4588dc2664b86c7d7711015c5a8fba6fb8e85c5db4c8aa87df7b4
4. Combine step 2 The published value goes first, then the value you have.
printf '01%s%s' "33d876ce028d85994e6db2b47b82058994c502000eb094575bddbbc68446f017" "421e392372d4588dc2664b86c7d7711015c5a8fba6fb8e85c5db4c8aa87df7b4" | xxd -r -p | shasum -a 256Should print 2abce3bdcef46a191b69fe46ed402e03352e5918eafe3b9b2d3824390dee8257
5. Combine step 3 The value you have goes first, then the published value.
printf '01%s%s' "2abce3bdcef46a191b69fe46ed402e03352e5918eafe3b9b2d3824390dee8257" "e9e349cbb7ad5b29c9d5c2e26eb529e8788d41583dafcfda1104d2236fc37874" | xxd -r -p | shasum -a 256Should print 6ddc36faf65fa6578b988653de332a1f027710b88843c4a0b1ff15f7b542a8ed
6. Combine step 4 The value you have goes first, then the published value.
printf '01%s%s' "6ddc36faf65fa6578b988653de332a1f027710b88843c4a0b1ff15f7b542a8ed" "88ae246968a8ec7aa1f6b0bda6d083ecc19de338136c0c6a5e32a081fd1fe6b3" | xxd -r -p | shasum -a 256Should print 55efe9c5ee1a98cc9194ca6df5c4bf2a9a53b4e50d9ad3ea34bf27437915d567
7. Combine step 5 The value you have goes first, then the published value.
printf '01%s%s' "55efe9c5ee1a98cc9194ca6df5c4bf2a9a53b4e50d9ad3ea34bf27437915d567" "2544de35a4de67f9861a894e1a2eed77c03547acb509e6b8af67a233143738ac" | xxd -r -p | shasum -a 256Should print 604c8251ec88e064e22355a066f4db7fea15afe24d6ee73fac3f907cdf446997
8. 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/0x1ed0b640723183fed258fb97c6562ff95da0496d1406e14653e12c062865f9d3The rules these commands follow are written down in full, so anyone can reimplement them.
Read the specification