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.

₿SHA-256 verifiable · anchored to the Bitcoin blockchain · append-only historyVerify it →

Photos pending

1921 UK Florin

Silver .500 — Item #8052761

George V florin. UK coins 1920-1946 were struck in .500 silver - the reading below is exactly right for a genuine example.

Metal

Silver

Analysis

Ag 50.2%

Weight

11.28 g

Dimensions

D28.5 x 2.3 mm

Tamper seal

Applied ✓

Record hash

0da4ebb7d50d…

✓ Matches UK Florin 1920–46 (.500) spec

Checks Performed

PASS

Weight

11.28 g — SCALE-01

PASS

Magnet

Non-magnetic; eddy-slide consistent with high-conductivity metal

PASS

Composition

Ag 50.2% — XRF-01

PASS

Conductivity

Ag .500 ✓ — PMV-01

PASS

Inspection

Design, edge and marks consistent with a genuine example; no plating wear; no concerns under magnification/UV

PASS

Dimensions

D28.5 x 2.3 mm - matches published spec — CAL-01

PASS

Ping

Resonance within expected profile

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

Instrument Analysis

XRF-01

Ag 50.2% · cal. 2026-05-28

PMV-01

Ag .500 ✓ · cal. 2026-06-01

Operator

PS · Metal Stack

Tested

2026-06-11

Composition — averaged reading (XRF)

Ag50.2%

Cu49.1%

Verification Record

Record #8052761 · metalstack.app/8052761

Verification Details

Opened

2026-06-11 09:42:10 UTC

Completed

2026-06-11 12:30:00 UTC

Operator

PS · Metal Stack

Checks

7 recorded · bench check

Tamper seal

Hologram applied

Metal Stack Item Register

Item Details

Item No.

#8052761

Name

1921 UK Florin

Metal

Silver .500

Weight

11.28 g

Analysis

Ag 50.2%

Photos

0 archived with hashes

Status

Verified

Audit Trail

Timestamp	Event
2026-06-11 09:42:10 UTC	Item received into intake
2026-06-11 09:48:31 UTC	Weighed: 11.28 g - SCALE-01, operator PS
2026-06-11 09:51:07 UTC	Magnet & eddy-slide: non-magnetic, high-conductivity response
2026-06-11 09:54:20 UTC	Composition: Ag 50.2% - XRF-01, operator PS
2026-06-11 09:56:40 UTC	Conductivity (secondary): Ag .500 ✓ - PMV-01 (Sigma)
2026-06-11 10:00:05 UTC	Inspection: marks & construction consistent; no plating wear
2026-06-11 10:02:40 UTC	Supplementary: dimensions D28.5 x 2.3 mm match spec; ping within profile
2026-06-11 10:08:15 UTC	Tamper-evident hologram seal applied
2026-06-11 10:11:23 UTC	Record published - status: verified
2026-06-11 10:14:02 UTC	Verification card MS-8052761 issued
2026-06-11 12:30:00 UTC	Listed for sale

Record Hash · SHA-256

0da4ebb7d50d54cd4fc860b4b024107e01757a467bb06dd0ed00ef2b4da63a5a

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 /8052761/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.