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Verified on Base

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.

Remember when school supplies had personality?

@90sTimeCapsule · 27 Sept 2026

Stamp ID
STAMP-2026-0927-UBMEHTYO
Content hash
4cd059c9d7c006b51c319a58f35115fb3492a8d7355e396e37f611141325d3c9
Day recorded
2026-09-28
Articles recorded that day
16
Attestation UID
0xf90e9bc451eee5367128ecc6c707fc5352ef0515b57dec1f5af014911dd29347
View on EAS
Transaction
0x0f2874f7536c4d6526c65e0119f22d2ba40a142cf577fc5ab655a4834d402d41
View on Basescan
Stamped
28 Sept 2026

Recorded on Base using canonicalization v2 and record format v1.

How this article reaches the blockchain

It was combined with the other 15 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
0x9ee057b18a40354df8834e934598fbc796300a0ff335f03c76fbbae162d07d24

Built from this article's content hash and its stamp ID, as sha256(0x00 || sha256(utf8(stampId)) || contentHash).

  1. Step 1, combined with the value before it
    0xd4b54aae28b419e86a0c619bb0fe518548e5edbef99678e1c5d59d4c4a91cd20
    0x6db78f097b764349f01f43f95876028c309d337852e821580081333eba2a9c23
  2. Step 2, combined with the value before it
    0x16841faad39998c56f30a4d636201c479c2173f306835d2f28e922dae2792061
    0xd3c2f94c5c767cdb10be31c6ddf7bc5882f37bdff20906c367194ada68ba2524
  3. Step 3, combined with the value after it
    0x38074abb35e4ffd876d923d5db6e19e3da76b6bf9c7bd290ffdf353c791bca20
    0x189f16615f033de7dd9a4b992b1aef6470f63541e5680e16fcbbeed9fdc2af1e
  4. Step 4, combined with the value before it
    0x6eaca6f8fad3941a58480910f7552e56ce37d770b0737e6b02e39bbbe2017c73
    0x01089cc494102438cf94dcf8e1f212fa7cd9533e8e954ccc633bfbcec4587c94

    This is the value for the whole day.

Value these steps arrive at
0x01089cc494102438cf94dcf8e1f212fa7cd9533e8e954ccc633bfbcec4587c94

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
0x01089cc494102438cf94dcf8e1f212fa7cd9533e8e954ccc633bfbcec4587c94
Read from Base
0x01089cc494102438cf94dcf8e1f212fa7cd9533e8e954ccc633bfbcec4587c94
Read it yourself on EAS

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":"Lisa Frank","src":"https://media.vitahash.org/articles/abccf150-454e-42e1-b438-0420f…

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.

For a technical reader: the terminal route

  1. 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-2026-0927-UBMEHTYO/canonical" | shasum -a 256

    Should print 4cd059c9d7c006b51c319a58f35115fb3492a8d7355e396e37f611141325d3c9

  2. 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-2026-0927-UBMEHTYO CONTENT=4cd059c9d7c006b51c319a58f35115fb3492a8d7355e396e37f611141325d3c9 DIGEST=$(printf '%s' "$STAMP" | shasum -a 256 | cut -d' ' -f1) printf '00%s%s' "$DIGEST" "$CONTENT" | xxd -r -p | shasum -a 256

    Should print 9ee057b18a40354df8834e934598fbc796300a0ff335f03c76fbbae162d07d24

  3. 3. Combine step 1

    The published value goes first, then the value you have.

    printf '01%s%s' "d4b54aae28b419e86a0c619bb0fe518548e5edbef99678e1c5d59d4c4a91cd20" "9ee057b18a40354df8834e934598fbc796300a0ff335f03c76fbbae162d07d24" | xxd -r -p | shasum -a 256

    Should print 6db78f097b764349f01f43f95876028c309d337852e821580081333eba2a9c23

  4. 4. Combine step 2

    The published value goes first, then the value you have.

    printf '01%s%s' "16841faad39998c56f30a4d636201c479c2173f306835d2f28e922dae2792061" "6db78f097b764349f01f43f95876028c309d337852e821580081333eba2a9c23" | xxd -r -p | shasum -a 256

    Should print d3c2f94c5c767cdb10be31c6ddf7bc5882f37bdff20906c367194ada68ba2524

  5. 5. Combine step 3

    The value you have goes first, then the published value.

    printf '01%s%s' "d3c2f94c5c767cdb10be31c6ddf7bc5882f37bdff20906c367194ada68ba2524" "38074abb35e4ffd876d923d5db6e19e3da76b6bf9c7bd290ffdf353c791bca20" | xxd -r -p | shasum -a 256

    Should print 189f16615f033de7dd9a4b992b1aef6470f63541e5680e16fcbbeed9fdc2af1e

  6. 6. Combine step 4

    The published value goes first, then the value you have.

    printf '01%s%s' "6eaca6f8fad3941a58480910f7552e56ce37d770b0737e6b02e39bbbe2017c73" "189f16615f033de7dd9a4b992b1aef6470f63541e5680e16fcbbeed9fdc2af1e" | xxd -r -p | shasum -a 256

    Should print 01089cc494102438cf94dcf8e1f212fa7cd9533e8e954ccc633bfbcec4587c94

  7. 7. 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/0xf90e9bc451eee5367128ecc6c707fc5352ef0515b57dec1f5af014911dd29347

The rules these commands follow are written down in full, so anyone can reimplement them.

Read the specification