Verify

Sign inSign up

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 we had to rewind a cassette tape with a pencil? 📼

@90sTimeCapsule · 5 Nov 2026

Stamp ID
STAMP-2026-1105-V3CQRPMH
Content hash
d419f6fec90bf3ac284c35b07e53acc11a196fa02a64aebfacea8ae9cdd9b824
Day recorded
2026-11-06
Articles recorded that day
12
Attestation UID
0xf18b4a820f1ceeeeb38ce9fccab69ef519d3effbb8d1bd928e7bcba4536cb592
View on EAS
Transaction
0x14693aefb1bbea4f15075a913bb23e04319b39086cdc62f7b9c08d1a2e5a89db
View on Basescan
Stamped
6 Nov 2026

Recorded on Base using canonicalization v2 and record format v1.

How this article reaches the blockchain

It was combined with the other 11 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
0x3b831f6a572e4a93329437e89931b7cb5f532378011ee07e3ab65ab3af107cc5

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
    0x72e5810c4f841edd11a8555cc6932433162d4b62f19d891358f7d86e25e11ffc
    0xfa40a17d996ec80098cbea6f5d53483fb84051aa3462bf260fdeb73e57520d64
  2. Step 2, combined with the value before it
    0x2c98ee4937e52b8b45c1839288b4b4f678bf322a824a86b983393cf2cbd226ab
    0xf119904624d5c3eec5a49f2357ad6ebe30995fe5bb8735024047c82ce6f4b376
  3. Step 3, combined with the value before it
    0x44df682a6023b81e87ff829ccca3e146cb12d98ec2a65d04100ea772c6deb9ef
    0xefb0a2841ae86a42f2cad5934d41fc3fe4e5eb0afa96bca6b150b3ea749097db

    This is the value for the whole day.

Value these steps arrive at
0xefb0a2841ae86a42f2cad5934d41fc3fe4e5eb0afa96bca6b150b3ea749097db

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
0xefb0a2841ae86a42f2cad5934d41fc3fe4e5eb0afa96bca6b150b3ea749097db
Read from Base
0xefb0a2841ae86a42f2cad5934d41fc3fe4e5eb0afa96bca6b150b3ea749097db
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":[{"content":[{"text":"Before playlists, streaming, and skipping songs in two seconds, we had to physic…

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-2026-1105-V3CQRPMH/canonical" | shasum -a 256

    Should print d419f6fec90bf3ac284c35b07e53acc11a196fa02a64aebfacea8ae9cdd9b824

  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-2026-1105-V3CQRPMH CONTENT=d419f6fec90bf3ac284c35b07e53acc11a196fa02a64aebfacea8ae9cdd9b824 DIGEST=$(printf '%s' "$STAMP" | shasum -a 256 | cut -d' ' -f1) printf '00%s%s' "$DIGEST" "$CONTENT" | xxd -r -p | shasum -a 256

    Should print 3b831f6a572e4a93329437e89931b7cb5f532378011ee07e3ab65ab3af107cc5

  3. 3. Combine step 1

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

    printf '01%s%s' "3b831f6a572e4a93329437e89931b7cb5f532378011ee07e3ab65ab3af107cc5" "72e5810c4f841edd11a8555cc6932433162d4b62f19d891358f7d86e25e11ffc" | xxd -r -p | shasum -a 256

    Should print fa40a17d996ec80098cbea6f5d53483fb84051aa3462bf260fdeb73e57520d64

  4. 4. Combine step 2

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

    printf '01%s%s' "2c98ee4937e52b8b45c1839288b4b4f678bf322a824a86b983393cf2cbd226ab" "fa40a17d996ec80098cbea6f5d53483fb84051aa3462bf260fdeb73e57520d64" | xxd -r -p | shasum -a 256

    Should print f119904624d5c3eec5a49f2357ad6ebe30995fe5bb8735024047c82ce6f4b376

  5. 5. Combine step 3

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

    printf '01%s%s' "44df682a6023b81e87ff829ccca3e146cb12d98ec2a65d04100ea772c6deb9ef" "f119904624d5c3eec5a49f2357ad6ebe30995fe5bb8735024047c82ce6f4b376" | xxd -r -p | shasum -a 256

    Should print efb0a2841ae86a42f2cad5934d41fc3fe4e5eb0afa96bca6b150b3ea749097db

  6. 6. 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/0xf18b4a820f1ceeeeb38ce9fccab69ef519d3effbb8d1bd928e7bcba4536cb592

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

Read the specification