Gold Packaging and Provenance

Gold Packaging

The term “parcel” is used refer to any uniquely tracked item. Typically, a parcel will consist of a single gold bar packaged in a tamper evident GramChain® bag. If a bar has a serial number, the bar’s mass, brand and serial number are used as a unique identifier and it is placed in a type A bag.

For example, the parcel ID of a single Metalor bar would be identified using the bar serial number: 1kg METALOR bar - 1234567890

For bars or coins that do not have serial numbers or in the case that multiple bars are tracked together as a single parcel, they will be placed in a type Bx GramChain® bag which has its own serial number that can be used for tracking. Multi-item parcels must always contain identical items of the same brand, mass, metal and purity.

For example, a parcel ID containing five 100 gram Valcambi Bars in a type Bx bag with serial #B0002345 would be identified using the bag serial number as: 5x 100g VALCAMBI bars - B0002345

The Parcel ID is used by vaults and the GramChain® explorer to view and identify parcels. GramChain® parcels are also tracked by a GramChain® RFID chip and can be redundantly identified by either their Parcel ID or RFID.

Gold Photos

Photos are important because bullion bars have key details etched into the bar itself and comparing the photo with the scanned details provides an additional method to verify parcel data.

GramChain® requires minimum quality standards for the parcel photo taken at the vault. GramChain® photos must clearly show the following details:

  • The bar (type A) or bag (type Bx) serial number
  • The GramChain® RFID tag
  • For bags containing multiple items, the number of items must be clearly visible
  • The brand, metal, mass and purity of at least one item
  • White label bars must have a visible refinery hallmark

When a parcel photo is taken by the GramChain® scanner, a QR code is immediately added to the image which links to the public parcel data and the image’s hash is generated. The image hash is in turn hashed together with the salted hash of the scanner’s user ID, location, time and bar characteristics. The resulting event hash is stored on the Ethereum blockchain.

Both the raw data, photo and the hashes are public data. Furthermore, each new event contains a hash of the previous event. This system ensures that neither CACHE nor GramChain® can manipulate event data as any manipulation of prior event data will invalidate all subsequent event data.

Provenance Tracking

In the bullion industry, the provenance of bars, sometimes also referred to as the chain of integrity, is an important concept because provenance controls offer protection against both AML/CFT risks as well as fake bullion. CACHE works only with reputable liquidity and storage providers that follow standard industry best practices and can clearly document the source of their bullion.

A chain of integrity requires that once bullion has been redeemed by a private individual and removed from the tamper evident bag, it cannot re-enter the system without purity testing and AML/CFT checks. Re-entering into the chain of integrity can occur either by sending the bullion back to a refinery for recasting or by testing the bullion. In both cases AML/CFT screening is performed first.

Deposit of branded gold from outside GramChain’s chain of integrity requires two steps:

  1. Registration and verification of a CACHE Gold account.
  2. The bullion must be delivered to a vault with approved testing facilities (e.g. DUX) or to an approved refinery for recasting.

While no system is infallible, CACHE is designed to meet or exceed the AML/CFT requirements of the Singapore Precious Stones and Precious Metals (Prevention of Money Laundering and Terrorism Financing) Act 2019.

NOTICE OF COMPULSORY CGT TOKEN REDEMPTION

Date of Publication: 20 June 2025

Compulsory Redemption Date: 30 September 2025, 23:59:59 (Singapore Time)

CACHE is winding down its operations and will implement a compulsory redemption process in relation to all outstanding CACHE Gold Tokens (CGT). Please see the CACHE Terms of Service (the “TOS”) for more information on this compulsory redemption process, which may be found at https://cache.gold/terms-of-service. Capitalised terms in this notice shall have the meanings ascribed to them in the TOS. This notice should therefore be read in conjunction with the TOS.

The Compulsory Redemption Date is set for 30 September 2025 (Singapore Time). On that date:

  1. CGT tokens will cease to be backed by gold and will no longer be recognized, honored, or redeemable by CACHE. While CGT tokens may technically remains on the Ethereum blockchain, they will have no further utility, value, or backing.
  2. Subject to eligibility (please refer to the TOS for more information thereon), Pax Gold (PAXG) tokens will be distributed via an airdrop (a blockchain-based transfer that requires no action from you) in exchange for your CGT held in an Ethereum Wallet as at the Snapshot Time (not after). Each PAXG token represents 1 troy ounce of fine gold stored in LBMA-accredited vaults in London and issued by Paxos Trust Company.

The airdrop of PAXG tokens will be based on CGT balances recorded in the last Ethereum block mined prior to 30 September 2025, 23:59:59 Singapore Time (the “Snapshot Block”) (and the time at which the last Snapshot Block was mined being the “Snapshot Time”).

Each eligible Ethereum Wallet will receive:

Number of CGT tokens held in such Ethereum Wallet ÷ 31.1034768 (rounded down to the nearest 0.00000001 PAXG or 8 decimal places)

This conversion reflects that each CGT represents 1 gram of fine gold, and each PAXG represents 1 troy ounce (31.1034768 grams). No fiat or market price valuation will apply.

If you prefer to redeem your CGT manually (e.g., for physical gold or fiat), you may do so through the CACHE website no later than 26 September 2025, 23:59:59 Singapore Time.

By continuing to hold CGT, you are deemed to have (A) accepted the terms of the compulsory redemption process as set out in Clause 5A of our TOS, (B) accepted that all your rights in connection with the CGT held by you shall be extinguished upon the Compulsory Redemption Date, (C) agreed that, where eligible, the Compulsory Redemption Tokens airdropped into your Ethereum Wallet shall be in full and final settlement of your CGT tokens compulsorily redeemed, and (D) waived any right to further redemption, refund, or legal claim against CACHE following the Compulsory Redemption Date.


For assistance, please contact [email protected].


Thank you for supporting CACHE.