SPECIMEN — demonstration record. This record exists to show how a Metal Stack verification looks. It is not a real verification, its photographs are illustrative, and it will be removed as the live register grows.
METAL STACK VERIFIED
Verified by Metal StackRecord #4478023 · recorded 2026-06-12 10:11:23 UTC
Current status
● VERIFIED
₿SHA-256 verifiable · anchored to the Bitcoin blockchain · append-only historyVerify it →

100 g Cast Silver Bar

Silver .999 — Item #4478023

Cast fine silver bar, 100 grams.

Metal
Silver
Analysis
Ag 99.92%
Weight
99.97 g
Dimensions
50.6 x 29.2 x 7.1 mm
Tamper seal
Applied ✓
Record hash
547742c76923…
01

Checks Performed

PASS
Weight
99.97 g — SCALE-01
PASS
Magnet
Non-magnetic; eddy-slide consistent with high-conductivity metal
PASS
Composition
Ag 99.92% — XRF-01
PASS
Conductivity
Ag .999 ✓ — PMV-01
PASS
Inspection
Stamps and construction consistent; no plating wear or seams of concern under magnification/UV
PASS
Dimensions
50.6 x 29.2 x 7.1 mm - matches published spec — CAL-01

These are the checks performed on this item — the right tests for its form. We never imply a check we didn’t run.

02

Instrument Analysis

XRF-01
Ag 99.92% · cal. 2026-05-28
PMV-01
Ag .999 ✓ · cal. 2026-06-01
Operator
PS · Metal Stack
Tested
2026-06-12
Composition — averaged reading (XRF)
Ag99.92%
Cu0.05%
03

Verification Record

METAL STACK VERIFIED
Metal Stack

Verification Record

Record #4478023 · metalstack.app/4478023

Verification Details

Opened
2026-06-12 09:42:10 UTC
Completed
2026-06-12 12:30:00 UTC
Operator
PS · Metal Stack
Checks
6 recorded · bench check
Tamper seal
Hologram applied
Register
Metal Stack Item Register

Item Details

Item No.
#4478023
Name
100 g Cast Silver Bar
Metal
Silver .999
Weight
99.97 g
Analysis
Ag 99.92%
Photos
0 archived with hashes
Status
Verified

Audit Trail

TimestampEvent
2026-06-12 09:42:10 UTCItem received into intake
2026-06-12 09:48:31 UTCWeighed: 99.97 g - SCALE-01, operator PS
2026-06-12 09:51:07 UTCMagnet & eddy-slide: non-magnetic, high-conductivity response
2026-06-12 09:54:20 UTCComposition: Ag 99.92% - XRF-01, operator PS
2026-06-12 09:56:40 UTCConductivity (secondary): Ag .999 ✓ - PMV-01 (Sigma)
2026-06-12 10:00:05 UTCInspection: marks & construction consistent; no plating wear
2026-06-12 10:02:40 UTCSupplementary: dimensions 50.6 x 29.2 x 7.1 mm match spec
2026-06-12 10:08:15 UTCTamper-evident hologram seal applied
2026-06-12 10:11:23 UTCRecord published - status: verified
2026-06-12 10:14:02 UTCVerification card MS-4478023 issued
2026-06-12 12:30:00 UTCListed for sale
Record Hash · SHA-256
547742c76923025a35754905aa41e74714c7da2f9dd5d12b5e87e8557d5a658c

This record is generated from the Metal Stack item register and provides a tamper-evident log of the checks performed on this item. The record hash is SHA-256 over the verification facts and photograph fingerprints — any alteration to those changes the hash. Events are appended only; the register does not permit editing of past entries.

Metal Stack checks are non-destructive. They indicate that this item is consistent with the stated metal. Internal adulteration cannot be fully excluded without advanced testing. They are not a guarantee of authenticity, not a statement of legal fineness, and not a substitute for official hallmarking or assay-office certification. Under the Hallmarking Act 1973, legal fineness is determined only by a UK Assay Office hallmark.

Don't take our word for it — check the maths yourself. This record's fingerprint is computed from published data only. Your browser will fetch that data, re-run SHA-256 on your own device and compare the result — then let you try to tamper with the record and watch the fingerprint destroy itself. Prefer raw data? It's at /4478023/record.json.
₿The whole register is timestamped onto the Bitcoin blockchain every day via OpenTimestamps — the same SHA-256 cryptography Bitcoin runs on — so its history can't be backdated, by us or anyone. See the live proof →
⚠ Check the address

Genuine Metal Stack records live only at metalstack.app. If a card or QR code sends you anywhere else, treat the item as unverified and report it.

✓ Match the item

Compare the item in hand against the photographs and the weight to 0.01 g. The tamper hologram must be intact — it shows a clear VOID pattern when lifted, so a damaged or missing hologram means the seal is void.