Touchstone Assay
Dated SIU — SIU-2026a
$0.0014
07 Sep 2026 provisional
Correction notice — published after this print, disclosing a fact that does not change dated_siu:
  • 25 Sep 2026 — dated_siu previously rounded to a fixed 4 decimal places rather than 4 significant figures — found live and fixed the same day, 2026-09-25 (docs/methodology.md's Rounding section). At this print's price level that was too coarse to show real day-to-day movement. This print's signed body is never edited — the published figure (0.0014) stands. Recomputed from this print's own published basket_costs and weights (Σ weight × basket_cost, rounded under the corrected 4-significant-figure rule, reproducible by anyone from this print's own published figures alone), the real value is 0.001422.
— 0.0% since 06 Sep 2026 — Unchanged from the previous print.
Equal weighting, disclosed: basket costs span 3.9× across the 4 qualifying constituents. 2 of 4 constituents (50%) sit at or above the mean basket cost and together account for 76% of the summed basket cost Dated SIU is computed from — equal weighting still gives each of them the same 1÷4 nominal share. Dated SIU therefore tracks the more expensive end of the basket more closely than a demand-weighted index would. See the methodology's Weighting section, and Frontier SIU / Commodity SIU, the tier prints published alongside this one for exactly this reason.

Exchange-rate table

ModelUSD / SIUSpread to indexSIU per $1
deepseek-v3.2 $0.0018 +28% 549.6
llama-3.3-70b-deepinfra $0.0007 -50% 1414.4
mistral-small-3.2-24b-instruct $0.0006 -54% 1539.7
qwen-2.5-72b-instruct $0.0025 +77% 398.1

Floor & market spread

Not yet published — the floor needs a measured hardware-rental rate for the reference configuration, which this print does not yet include.

Sensitivity

The print recomputed under alternative cache and batch-discount policies, so the effect of those policy choices is stated rather than hidden inside one number.

Policy variantDated SIUDeltaApplies to
cache-enabled: 40% of T2 input at 10% of input price $0.0010 -33.1% deepseek-v3.2, llama-3.3-70b-deepinfra, mistral-small-3.2-24b-instruct, qwen-2.5-72b-instruct
batch-discount: 50% off input and output $0.0007 -50.0% deepseek-v3.2, llama-3.3-70b-deepinfra, mistral-small-3.2-24b-instruct, qwen-2.5-72b-instruct

Methodology, signature & anchor

Methodology
v0-draft
Cost of production
$0.0859
Signature
0x03c0cfe0…ac6a6da2
Public key
0x030c598e…e25cb299
Anchor tx — Base Sepolia
0xe8922d6a…5e059aa7 (base-sepolia)
Anchor tx — Arc Testnet
not anchored: anchoring on Arc Testnet began with the print dated 2026-10-15
Raw runs
https://github.com/petrkrulis2022/dated-siu-inference/tree/main/data/runs/2026-09-07-commodity

Dated SIU is an assessment of qualifying inference work under this basket version, model/provider configuration and quality gate — not a prediction of production agent costs, which vary with workflow design, tool reliability, retry policy and context handling.

Verify this yourself

Don't take this page's word for it — every value below is checkable independently. Read the steps, run one command, or have an agent read verify.json.

The body hash

Body hash
0x502274339fac17e32581a837be862b11f0c078b06e15183fd7315b342cb97dbd
Recovered signer
0x284ff2f8605ff8afeda6959b856bb7e6d48f845a

The body hash is made like this:

  1. Download this print's JSON: https://raw.githubusercontent.com/petrkrulis2022/dated-siu-inference/main/data/prints/2026-09-07-commodity.json.
  2. Remove exactly these five fields and keep everything else as published: signature, public_key, anchor, superseded_by, correction_notes. The last three are added after signing, which is why they cannot be part of the hash.
  3. Canonicalise what is left with RFC 8785 (JCS): keys sorted, no whitespace, numbers and strings as JSON writes them.
  4. Take the keccak256 hash of the UTF-8 bytes of that text (the original Keccak padding Ethereum uses, not NIST SHA3-256). Written as 0x and 64 hex digits, it equals the body hash above.
Or run one command 
curl -O https://prints.touchstoneassay.com/verify-print.mjs
node verify-print.mjs 2026-09-07-commodity

Plain Node 18 or later, nothing to install, no keys. It does the four steps above, then looks the anchor transaction up on the chain's explorer and looks for a PrintPosted event carrying your hash. Exit code 0 means it matched. It does not check the signature: see the recovered signer above and the publisher below.

Anchored on Base Sepolia

TouchstoneAttestation
0xF60701793eD168ffd6e818e1DCcb600393297190 (base-sepolia · chain id 84532)
Publisher (fixed in the contract)
0x284ff2F8605Ff8AFeDa6959B856Bb7E6d48f845a — the recovered signer above is this publisher
Anchor tx
0xe8922d6a91e30f9098c719d18535a208911d174c21f9d2bcbb7eae155e059aa7 (base-sepolia)
  1. Open the contract link above on its explorer, go to "Read Contract", call publisher(), and confirm it equals the recovered signer shown above.
  2. On the same "Read Contract" tab, call postedAt(bytes32) with the body hash above and confirm it returns a non-zero timestamp: the Unix time, in seconds, at which this hash was first recorded.
  3. Open the anchor transaction, go to its Logs tab, and confirm a PrintPosted event whose bodyHash equals the body hash above.

Anchored on Arc Testnet

TouchstoneAttestation
0x12b886b043feABc3d90bBae3ae206d22b208160d (arc-testnet · chain id 5042002)
Publisher (fixed in the contract)
0x284ff2F8605Ff8AFeDa6959B856Bb7E6d48f845a — the recovered signer above is this publisher
Anchor tx
not anchored: anchoring on Arc Testnet began with the print dated 2026-10-15

All prints