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-2026-0926-4QA2GTKZ Content hash 90c8b27f740d024ff1efbf5212fceefa4e4f1271081bde7abee7753897939483 Articles recorded that day 19 Attestation UID 0x84cb5f3777a1d6bf11bc9929df9416c96f83e77a90905fa5ee406bde170afbe4 View on EAS Transaction 0x2bc739663021c9616f855df1349f0c9e05f39f843e986166a72ea6bd60bfa4ec 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 18 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 0x898701fbdd63a82914e83ce81b59a0ee9e883acb58f27dc771df28cddd8e2a5b Built from this article's content hash and its stamp ID, as sha256(0x00 || sha256(utf8(stampId)) || contentHash).
Step 1, combined with the value after it 0xc637e5950196d94c74f3b72a884b738ee8d82a14505fc980bafe88f8739f077f 0xf674991f6c6d5b5b1417fb4488329ea56a6029c323e4fe5733390ef0348248da Step 2, combined with the value after it 0x64b3845bf9e61fcf5c38d91f7bb9c0ac658719a174a6a35372fc9571adf0ae43 0xe8c7f1ddc485415d6d0cca96d115b2b54c9fab4a1c461ec11ec35cc2de299db1 Step 3, combined with the value before it 0xebd5f0b49052bdd25c9b9040bc3c4364ff8e88a0335eab5ad00a9cb21e02ef12 0xd06cf380e63c7e122ed0df0fc07ba07ded91a9bc4130807f0831afb110cf774d Step 4, combined with the value after it 0x57711de9e370bc645f82e3badf941f656fd3ba3e7114bf721e696aad647fff65 0x43d0bf3bed65c6d72323e4f8ee304cbe8a76398161018db8037b86aac993199b Step 5, combined with the value after it 0xd5acd05b3170caa30612ab1b1206ba3a18114f6e7bec9204be2832f1245f31f0 0xd5bae37d71e637433d461768eb3a88245c40982e2443fd3dd56fe575a55dd300 This is the value for the whole day.
Value these steps arrive at 0xd5bae37d71e637433d461768eb3a88245c40982e2443fd3dd56fe575a55dd300 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 0xd5bae37d71e637433d461768eb3a88245c40982e2443fd3dd56fe575a55dd300 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.
{"abstract":null,"agreement":false,"authors":[{"identity":"90sTimeCapsule","position":1,"role":"solo","weight":1.0000}],"body":{"content":[{"attrs":{"alt":"photos","src":"https://media.vitahash.org/articles/abccf150-454e-42e1-b438-0420f70fc…Copy this text, paste it into any SHA-256 tool, and compare the result with the hash shown above. If the two match, this is exactly what Vitahash recorded.
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-2026-0926-4QA2GTKZ/canonical" | shasum -a 256Should print 90c8b27f740d024ff1efbf5212fceefa4e4f1271081bde7abee7753897939483
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-2026-0926-4QA2GTKZ
CONTENT=90c8b27f740d024ff1efbf5212fceefa4e4f1271081bde7abee7753897939483
DIGEST=$(printf '%s' "$STAMP" | shasum -a 256 | cut -d' ' -f1)
printf '00%s%s' "$DIGEST" "$CONTENT" | xxd -r -p | shasum -a 256Should print 898701fbdd63a82914e83ce81b59a0ee9e883acb58f27dc771df28cddd8e2a5b
3. Combine step 1 The value you have goes first, then the published value.
printf '01%s%s' "898701fbdd63a82914e83ce81b59a0ee9e883acb58f27dc771df28cddd8e2a5b" "c637e5950196d94c74f3b72a884b738ee8d82a14505fc980bafe88f8739f077f" | xxd -r -p | shasum -a 256Should print f674991f6c6d5b5b1417fb4488329ea56a6029c323e4fe5733390ef0348248da
4. Combine step 2 The value you have goes first, then the published value.
printf '01%s%s' "f674991f6c6d5b5b1417fb4488329ea56a6029c323e4fe5733390ef0348248da" "64b3845bf9e61fcf5c38d91f7bb9c0ac658719a174a6a35372fc9571adf0ae43" | xxd -r -p | shasum -a 256Should print e8c7f1ddc485415d6d0cca96d115b2b54c9fab4a1c461ec11ec35cc2de299db1
5. Combine step 3 The published value goes first, then the value you have.
printf '01%s%s' "ebd5f0b49052bdd25c9b9040bc3c4364ff8e88a0335eab5ad00a9cb21e02ef12" "e8c7f1ddc485415d6d0cca96d115b2b54c9fab4a1c461ec11ec35cc2de299db1" | xxd -r -p | shasum -a 256Should print d06cf380e63c7e122ed0df0fc07ba07ded91a9bc4130807f0831afb110cf774d
6. Combine step 4 The value you have goes first, then the published value.
printf '01%s%s' "d06cf380e63c7e122ed0df0fc07ba07ded91a9bc4130807f0831afb110cf774d" "57711de9e370bc645f82e3badf941f656fd3ba3e7114bf721e696aad647fff65" | xxd -r -p | shasum -a 256Should print 43d0bf3bed65c6d72323e4f8ee304cbe8a76398161018db8037b86aac993199b
7. Combine step 5 The value you have goes first, then the published value.
printf '01%s%s' "43d0bf3bed65c6d72323e4f8ee304cbe8a76398161018db8037b86aac993199b" "d5acd05b3170caa30612ab1b1206ba3a18114f6e7bec9204be2832f1245f31f0" | xxd -r -p | shasum -a 256Should print d5bae37d71e637433d461768eb3a88245c40982e2443fd3dd56fe575a55dd300
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/0x84cb5f3777a1d6bf11bc9929df9416c96f83e77a90905fa5ee406bde170afbe4The rules these commands follow are written down in full, so anyone can reimplement them.
Read the specification