Verify

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 Tamagotchis?

Maya Hale · 22 Sept 2026

Stamp ID
STAMP-2026-0922-GAS2KY77
Content hash
cf7c8838a211ab02a3c28001280e8cfd98e099d7f1404ea4c9d15ac3c62c0ded
Day recorded
2026-09-23
Articles recorded that day
19
Attestation UID
0x312f5bdaee9c1cd4c9c9e451ce2d932f82aa65985854eb05f9075f80314e1b63
View on EAS
Transaction
0x54b4b79e498e2ec45d4be92b4c1c5b8f94b2c646cefaf982166895ba22ef85c1
View on Basescan
Stamped
23 Sept 2026

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
0x0b32d7b08db355738c330ecb7eb8fbe8bd9f7c3b212d11a58c8148bf2ace5ce8

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 after it
    0x92a46be96260703279febb315d171ec9fb7e93c8559223ab965a963ecd453dda
    0xabde4fed031ae0e8d776b12d9aa03e16dfdaef9a929f35d96db23b5a8464a746
  2. Step 2, combined with the value after it
    0xbccfad193fdadcc3e8a8b9408c1cbfbc1b864064766efaf63d90a116f6e662cf
    0x3abd91dc306fc0d1f7e199ac8951f32762f59828e865018111f4f58c336a7964
  3. Step 3, combined with the value after it
    0xe2c8f5bb8f5c48db8b076ee3c4a9734ffb5d0cd5c260b3db702d80d746e3de65
    0x3faa6df09366d7ee5ff95f70459f23ca502d10650176da7c4b4541197f2214d3
  4. Step 4, combined with the value before it
    0x4be71e2b9fb83530c4a209f1bd3a792d9708748cfb7d4c6d07cad2bb9b0f9854
    0xe63d808641c9100111b6b6585a9ed386e34c5f36ce79c50f14b6aaf0618b12fe
  5. Step 5, combined with the value after it
    0x7a88f62292afb2658d20a5063a2b18d13343fa8e26ae33cb4daa3b0a0c688944
    0x08de2d0ad5fb90d3e053eb878d60fbda4d2fb97afd72ecdf81de0214801fd41d

    This is the value for the whole day.

Value these steps arrive at
0x08de2d0ad5fb90d3e053eb878d60fbda4d2fb97afd72ecdf81de0214801fd41d

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
0x08de2d0ad5fb90d3e053eb878d60fbda4d2fb97afd72ecdf81de0214801fd41d
Read from Base
0x08de2d0ad5fb90d3e053eb878d60fbda4d2fb97afd72ecdf81de0214801fd41d
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":"mayahale","position":1,"role":"solo","weight":1.0000}],"body":{"content":[{"content":[{"text":"So nostalgic thinking about Mametchi in the 2000s ❤️ Those little pixel pets had me ch…

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-2026-0922-GAS2KY77/canonical" | shasum -a 256

    Should print cf7c8838a211ab02a3c28001280e8cfd98e099d7f1404ea4c9d15ac3c62c0ded

  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-2026-0922-GAS2KY77 CONTENT=cf7c8838a211ab02a3c28001280e8cfd98e099d7f1404ea4c9d15ac3c62c0ded DIGEST=$(printf '%s' "$STAMP" | shasum -a 256 | cut -d' ' -f1) printf '00%s%s' "$DIGEST" "$CONTENT" | xxd -r -p | shasum -a 256

    Should print 0b32d7b08db355738c330ecb7eb8fbe8bd9f7c3b212d11a58c8148bf2ace5ce8

  3. 3. Combine step 1

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

    printf '01%s%s' "0b32d7b08db355738c330ecb7eb8fbe8bd9f7c3b212d11a58c8148bf2ace5ce8" "92a46be96260703279febb315d171ec9fb7e93c8559223ab965a963ecd453dda" | xxd -r -p | shasum -a 256

    Should print abde4fed031ae0e8d776b12d9aa03e16dfdaef9a929f35d96db23b5a8464a746

  4. 4. Combine step 2

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

    printf '01%s%s' "abde4fed031ae0e8d776b12d9aa03e16dfdaef9a929f35d96db23b5a8464a746" "bccfad193fdadcc3e8a8b9408c1cbfbc1b864064766efaf63d90a116f6e662cf" | xxd -r -p | shasum -a 256

    Should print 3abd91dc306fc0d1f7e199ac8951f32762f59828e865018111f4f58c336a7964

  5. 5. Combine step 3

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

    printf '01%s%s' "3abd91dc306fc0d1f7e199ac8951f32762f59828e865018111f4f58c336a7964" "e2c8f5bb8f5c48db8b076ee3c4a9734ffb5d0cd5c260b3db702d80d746e3de65" | xxd -r -p | shasum -a 256

    Should print 3faa6df09366d7ee5ff95f70459f23ca502d10650176da7c4b4541197f2214d3

  6. 6. Combine step 4

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

    printf '01%s%s' "4be71e2b9fb83530c4a209f1bd3a792d9708748cfb7d4c6d07cad2bb9b0f9854" "3faa6df09366d7ee5ff95f70459f23ca502d10650176da7c4b4541197f2214d3" | xxd -r -p | shasum -a 256

    Should print e63d808641c9100111b6b6585a9ed386e34c5f36ce79c50f14b6aaf0618b12fe

  7. 7. Combine step 5

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

    printf '01%s%s' "e63d808641c9100111b6b6585a9ed386e34c5f36ce79c50f14b6aaf0618b12fe" "7a88f62292afb2658d20a5063a2b18d13343fa8e26ae33cb4daa3b0a0c688944" | xxd -r -p | shasum -a 256

    Should print 08de2d0ad5fb90d3e053eb878d60fbda4d2fb97afd72ecdf81de0214801fd41d

  8. 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/0x312f5bdaee9c1cd4c9c9e451ce2d932f82aa65985854eb05f9075f80314e1b63

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

Read the specification