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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.

Anthropic IPO

cardiovitahash · 26 Aug 2026

Stamp ID
STAMP-2026-0826-W4DRTIQ6
Content hash
20cb9e3ac115f6c4739d86281662ee2f189c44afb9dc60ae7d971d0c3204f114
Day recorded
2026-08-27
Articles recorded that day
10
Attestation UID
0xe9594f1c42a4ac3701b860a351cf04e831783def05460049c9572d205cc57f43
View on EAS
Transaction
0xd0bb0633972b35907cdba8ec4fd69a6070b990a29412e09027453092ea78db06
View on Basescan
Stamped
27 Aug 2026

Recorded on Base Sepolia using canonicalization v1 and record format v1.

How this article reaches the blockchain

It was combined with the other 9 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
0x7b7fda5df3825f82020523113b76982e10ae90e34cb20208997858d61ce0ebea

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
    0xd6c4557c949627aad532fee69b59e340853aa7b2b3d787e0d2acc92c2a71c539
    0x8680bcd982597baa59b5474438998fb2c932f4e7c4dc44c0962bfa4b522c7829
  2. Step 2, combined with the value before it
    0xa21c8ba55f0fc6e57b545c6de25652a6b6edb54b52b930f491c0ed5edde1df08
    0xd18600dbfb6bcb059d5c725341c007e642eceb0a8393d6b788c0fb7609a936ac

    This is the value for the whole day.

Value these steps arrive at
0xd18600dbfb6bcb059d5c725341c007e642eceb0a8393d6b788c0fb7609a936ac

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
0xd18600dbfb6bcb059d5c725341c007e642eceb0a8393d6b788c0fb7609a936ac
Read from Base
0xd18600dbfb6bcb059d5c725341c007e642eceb0a8393d6b788c0fb7609a936ac
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,"authors":[{"identity":"cardiovitahash","position":1,"role":"solo","weight":1.0000}],"body":{"content":[{"content":[{"marks":[{"type":"bold"}],"text":"🚀 Anthropic is reportedly preparing for a potential IPO as early as next…

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-2026-0826-W4DRTIQ6/canonical" | shasum -a 256

    Should print 20cb9e3ac115f6c4739d86281662ee2f189c44afb9dc60ae7d971d0c3204f114

  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-2026-0826-W4DRTIQ6 CONTENT=20cb9e3ac115f6c4739d86281662ee2f189c44afb9dc60ae7d971d0c3204f114 DIGEST=$(printf '%s' "$STAMP" | shasum -a 256 | cut -d' ' -f1) printf '00%s%s' "$DIGEST" "$CONTENT" | xxd -r -p | shasum -a 256

    Should print 7b7fda5df3825f82020523113b76982e10ae90e34cb20208997858d61ce0ebea

  3. 3. Combine step 1

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

    printf '01%s%s' "d6c4557c949627aad532fee69b59e340853aa7b2b3d787e0d2acc92c2a71c539" "7b7fda5df3825f82020523113b76982e10ae90e34cb20208997858d61ce0ebea" | xxd -r -p | shasum -a 256

    Should print 8680bcd982597baa59b5474438998fb2c932f4e7c4dc44c0962bfa4b522c7829

  4. 4. Combine step 2

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

    printf '01%s%s' "a21c8ba55f0fc6e57b545c6de25652a6b6edb54b52b930f491c0ed5edde1df08" "8680bcd982597baa59b5474438998fb2c932f4e7c4dc44c0962bfa4b522c7829" | xxd -r -p | shasum -a 256

    Should print d18600dbfb6bcb059d5c725341c007e642eceb0a8393d6b788c0fb7609a936ac

  5. 5. 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-sepolia.easscan.org/attestation/view/0xe9594f1c42a4ac3701b860a351cf04e831783def05460049c9572d205cc57f43

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

Read the specification