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-2026-0925-WFX7BG27 Content hash 26143a3c4c75a8da80fbc45084907ac3e5d3faab5011fe52fbfb189e32a6be85 Articles recorded that day 20 Attestation UID 0xeca6201b1118aac08c5e90852685560efcd865d7b92d8dd755536bd900121d44 View on EAS Transaction 0x8773b62d3c7fe3c39180795fdbf303e39a988305339fd36d0f85017972c0bcd5 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 19 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 0xc0a2c1955e2ff8ba065bb5a7dc48c1f63dbd5586a3c50fc657fc572941af6685 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 0x2b448abd1fce2057ca80798e18f2e28f757ccb9c1eee0666404b488c69c7979f 0xde5d72e6facc516b521a9dcc7f7d35c21eac5292319837957ba97c08d6e19a17 Step 2, combined with the value after it 0x575aa995fa93b290cd04afd25a3ff70f5034e864bc7b21aa79c1f042031b5fef 0x338087d57076385362f8b946b1aeb173dce23ad0a0d0e2a793f84da82df6b81f Step 3, combined with the value before it 0xc1d5d231b268f46906a4da83c556378223bf6096ded3827d3cd87ed49e6fd45c 0x8b2476a9102c6f8fddeaea8b440d390005d5d4f4ebd31a5e0f185dd330f209ab This is the value for the whole day.
Value these steps arrive at 0x8b2476a9102c6f8fddeaea8b440d390005d5d4f4ebd31a5e0f185dd330f209ab 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 0x8b2476a9102c6f8fddeaea8b440d390005d5d4f4ebd31a5e0f185dd330f209ab 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.
The exact text is not available for this article right now. The command below still reaches it.
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-2026-0925-WFX7BG27/canonical" | shasum -a 256Should print 26143a3c4c75a8da80fbc45084907ac3e5d3faab5011fe52fbfb189e32a6be85
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-2026-0925-WFX7BG27
CONTENT=26143a3c4c75a8da80fbc45084907ac3e5d3faab5011fe52fbfb189e32a6be85
DIGEST=$(printf '%s' "$STAMP" | shasum -a 256 | cut -d' ' -f1)
printf '00%s%s' "$DIGEST" "$CONTENT" | xxd -r -p | shasum -a 256Should print c0a2c1955e2ff8ba065bb5a7dc48c1f63dbd5586a3c50fc657fc572941af6685
3. Combine step 1 The value you have goes first, then the published value.
printf '01%s%s' "c0a2c1955e2ff8ba065bb5a7dc48c1f63dbd5586a3c50fc657fc572941af6685" "2b448abd1fce2057ca80798e18f2e28f757ccb9c1eee0666404b488c69c7979f" | xxd -r -p | shasum -a 256Should print de5d72e6facc516b521a9dcc7f7d35c21eac5292319837957ba97c08d6e19a17
4. Combine step 2 The value you have goes first, then the published value.
printf '01%s%s' "de5d72e6facc516b521a9dcc7f7d35c21eac5292319837957ba97c08d6e19a17" "575aa995fa93b290cd04afd25a3ff70f5034e864bc7b21aa79c1f042031b5fef" | xxd -r -p | shasum -a 256Should print 338087d57076385362f8b946b1aeb173dce23ad0a0d0e2a793f84da82df6b81f
5. Combine step 3 The published value goes first, then the value you have.
printf '01%s%s' "c1d5d231b268f46906a4da83c556378223bf6096ded3827d3cd87ed49e6fd45c" "338087d57076385362f8b946b1aeb173dce23ad0a0d0e2a793f84da82df6b81f" | xxd -r -p | shasum -a 256Should print 8b2476a9102c6f8fddeaea8b440d390005d5d4f4ebd31a5e0f185dd330f209ab
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/0xeca6201b1118aac08c5e90852685560efcd865d7b92d8dd755536bd900121d44The rules these commands follow are written down in full, so anyone can reimplement them.
Read the specification