SOST Protocol — Proof of Personal Custody

SECTION 01

What Is PoPC

Definition

NOT TOKENIZATION

PoPC is not a tokenization of gold. It does not promise yield, stability, or redeemability. It is a voluntary time-bound commitment protocol with automatic economic consequences.

A participant promises to maintain custody of precious metals for a defined period, backs that promise with a SOST bond, and is rewarded if they keep their word. If they break it, their bond is slashed automatically — no human judge involved.

How PoPC Differs

COMPARISON

Protocol	Mechanism
MakerDAO	Deposit ETH (volatile crypto) → receive DAI. Collateral is crypto. Goal: price stability.
Compound / Aave	Deposit crypto → borrow crypto. All digital. No physical world connection.
Staking protocols	Lock token X → earn token X. Circular. No external asset backing.
SOST PoPC	Lock SOST bond → prove custody of real gold (XAUT/PAXG). Audited by PoW entropy. No custodian. No bridge.

SECTION 02

Model A — Self-Custody Bonds

For crypto natives, miners, and traders. Your gold never leaves your wallet. Only the SOST bond is at risk.

1. Declare

Declare Ethereum wallet holding XAUT/PAXG

→

2. Bond

Lock SOST bond (12-30% of gold value)

→

3. Commit

Maintain custody for 1-12 months

→

4. Audit

ConvergenceX entropy schedules random audits

→

5. Reward

Bond returned + reward from PoPC Pool

Dynamic Bond Calculation

RATIO-BASED

The bond percentage scales with the SOST/gold price ratio. System is ratio-based, not price-based — works at any gold/SOST price in any currency.

ratio = sost_price / gold_oz_price

if ratio < 0.0001  →  bond = 12%  // early stage
if ratio < 0.001   →  bond = 15%
if ratio < 0.01    →  bond = 20%
if ratio < 0.1     →  bond = 25%
if ratio < 0.2     →  bond = 26%
if ratio < 0.3     →  bond = 27%
if ratio < 0.4     →  bond = 28%
if ratio < 0.5     →  bond = 29%
if ratio ≥ 0.5     →  bond = 30%  // maximum

bond_sost = bond_usd / sost_price_TWAP_7d

Gold Price	SOST Price	Ratio	Bond %
$2,700	$1	0.00037	15%
$2,700	$100	0.037	25%
$2,700	$1,350	0.50	30%
$5,000	$2,500	0.50	30%

ConvergenceX Entropy Audits

DETERMINISTIC

No party — not the Foundation, not any server — decides when a user is audited. The schedule is derived deterministically from ConvergenceX block entropy.

// Audit seed derived from PoW entropy triple
seed = SHA256(block_id || commit || checkpoints_root)

// Audit trigger per contract, per period
r = PRF(seed, contractId, periodIndex)
if r < p(reputation_stars):
    AUDIT REQUIRED

Verification is fully scripted — no humans involved:

Step	Action
1	User signs message with Ethereum wallet
2	ecrecover() confirms identity
3	Verifier checks: token.balanceOf(wallet) ≥ committed_amount
4	EOA verification: extcodesize == 0 (no smart contracts)
5	Continuous custody check via historical balance sampling
6	Pass → checkpoint recorded. Fail → SLASH

EOA Requirement: The declared wallet must be an Externally Owned Account. Smart contract wallets, multisig wallets, and proxy contracts are not eligible. EOA status is verified at contract creation and at every audit. CREATE2 deployment after commitment triggers automatic slash.

Top-up & Extend

MODEL A

At any point before expiry you can increase your SOST bond and extend the contract duration. The contract restructures from the top-up moment — prior time settles proportionally, new period begins with the combined bond. Fee applies only to the new increment (5%). One contract, one reputation record.

SECTION 03

Model B — Timelocked Escrow

For precious metal investors and gold holders. Deposit XAUT/PAXG into an immutable escrow contract. Receive SOST immediately. No audits. No slash. No bond.

1. Deposit

Lock XAUT/PAXG into immutable escrow

→

2. Receive

Get SOST reward immediately

→

3. Wait

Gold locked for full term

→

4. Withdraw

Full gold returned at maturity

Escrow Architecture

IMMUTABLE

Property	Value
Contract type	Immutable (no proxy, no UUPS, no admin)
Functions	deposit(token, amount, unlockTime) + withdraw(depositId)
Withdrawal	Only original depositor, only after unlockTime
Admin key	None
Emergency withdrawal	None
Early exit	Not possible
Source code	Published, verified on explorer, independently audited

Foundation Role in Model B

NON-CUSTODIAL

Action	Status
Custody of escrowed gold	NO access, NO control
Watcher operation	Detects deposits, triggers SOST payout
Escrowed gold on balance sheet	Off-balance-sheet, transparency only
Watcher can steal gold	Impossible (escrow is autonomous)
Watcher can delay payout	Yes (liveness risk, not safety risk)
Autonomous claim fallback	claimReward(depositId) after 72h

The fundamental trade: Gold liquidity for SOST liquidity. Users cannot unlock escrowed gold before maturity. However, the SOST reward is delivered immediately at deposit — full liquidity from day 1.

Transitional by design: The Foundation's watcher role in Model B and manual verification in Model A are Phase 1 operational processes with planned automation paths. This is a constitutional commitment — as smart contracts and the sost-popc-daemon are deployed, Foundation manual involvement is permanently retired.

Time Extension

MODEL B

Before expiry you may extend the duration and earn a loyalty bonus on the additional reward period. Fee applies to the extra reward only (10%). The escrow is immutable — to add more metals, open a new parallel contract.

SECTION 04

Reward Structures

Non-guaranteed: Reward rates are operational reference parameters. They may be adjusted, budgeted per epoch, or paused for security without changing consensus rules. They do not constitute interest, promised yield, or a financial obligation of the protocol.

Model A — Reward Rates (Reference)

% OF BOND

Rewards denominated in SOST as a percentage of bond. Bond is fully recoverable upon successful completion. Protocol fee: 5% of reward.

Duration	Reward (% of bond)	Protocol Fee
1 month	1%	5%
3 months	4%	5%
6 months	9%	5%
9 months	15%	5%
12 months	22%	5%

// Model A reward calculation
base_reward  = bond_sost × reward_table[duration]
protocol_fee = base_reward × 0.05
user_reward  = base_reward - protocol_fee

// User receives: bond_sost + user_reward

Model B — Reward Rates (Reference)

% OF GOLD VALUE

Lower rates than Model A because there is no slash risk. SOST reward delivered immediately at deposit. Protocol fee: 10% of reward.

Duration	Total Reward	Protocol Fee
1 month	0.02% of gold value	10%
3 months	0.25% of gold value	10%
6 months	1.5% of gold value	10%
9 months	3.75% of gold value	10%
12 months	7% of gold value	10%

// Model B reward calculation
SOST_reward = gold_value × rate × (duration/12) / sost_price
protocol_fee = SOST_reward × 0.10
user_reward  = SOST_reward - protocol_fee

// User receives SOST immediately at deposit

Model A vs Model B

COMPARISON

Aspect	Model A	Model B
What you lock	SOST (bond)	Gold (escrow)
Your gold	In YOUR wallet	In escrow contract
Bond required	Yes (12-30%)	No
Reward timing	At completion if pass	Immediately
Slash risk	Lose bond	None
12-month rate (reference)	22% of bond	7% of gold value
Protocol fee	5%	10%
Best for	Crypto natives	Gold holders

FEE DESIGN

Fee Structure

Fee-at-Deposit Design

NEVER AT COMPLETION

All fees are charged at the moment of each operation — never at completion.

Model	Fee	Charged on
Model A	5% of bond	Per operation (opening or top-up increment)
Model B	10% of gross reward	Per operation (opening or extension)

// Example — Model A top-up:
Month 0: bond 100 SOST  →  fee 5 SOST
Month 2: top-up +50 SOST  →  fee 2.5 SOST
Total: 7.5 SOST // same cost as two separate contracts
                  // top-up is pure convenience

SECTION 05

Reputation System

Reputation stars (0-5) determine audit frequency and maximum commitment size. Stars are earned through successful contract completions and destroyed on slash.

☆☆☆☆☆

0 STARS — NEW

Max 0.5 oz

30% audit probability

★☆☆☆☆

1 STAR

Max 1 oz

20% audit probability

★★★☆☆

3 STARS

Max 3 oz

10% audit probability

★★★★★

5 STARS — VETERAN

Max 10 oz

5% audit probability

Price Bulletin

NO ON-CHAIN ORACLE

Bond sizing uses a Price Bulletin model with explicit user consent. No on-chain oracle. No discretionary Foundation pricing.

Property	Value
Published by	Foundation (daily)
Data	SOST/USD 7d TWAP, Gold/USD 7d TWAP
Sources	Public exchange APIs (reproducible)
Distribution	Website + GitHub + IPFS mirror
User consent	Required — user signs exact bond terms
On-chain prices	None — not consensus-critical
Malicious bulletin	Users simply refuse to sign — no funds at risk

SECTION 06

Slashing Mechanics

Model A only. Model B has no slash risk — gold custody is enforced by the escrow contract.

SLASH TRIGGER

Custody Violation

XAUT/PAXG balance below committed amount at audit time, or no response after 48h grace period (with confirmed RPC availability).

SLASH SPLIT

50/50 Distribution

50% of slashed bond goes to PoPC Pool (funds future rewards). 50% goes to Gold Vault (buys more gold collateral). No supply is burned.

Slash Consequences

AUTOMATIC

Consequence	Detail
Bond	Lost — split 50/50 between PoPC Pool and Gold Vault
Reputation	Destroyed (reset to 0 stars)
Address	Blacklisted
Supply effect	No burn — slashed SOST recycled into vaults
Human override	None — fully automatic

Design principle: Every fraud detected strengthens the protocol. Half funds future honest participants, half buys more gold. No supply is destroyed — it is recycled where it creates the most value.

SECTION 07

Epoch 2 Activation

Activation Timeline

FEBRUARY 2027

Parameter	Value
Target activation	February 2027
Consensus changes	None — PoPC is application-layer
Pool funding	25% of every block reward from genesis
Pool at activation (~1 year)	~103,160 SOST accumulated
Escrow contract	Immutable, published and audited before activation
Adaptive rule	If SOST/gold ratio > 1.5 for 30 days, PoPC accepts SOST as custody asset

Pool Sustainability

LONG-TERM

Scenario	Annual Rewards	Pool Usage
200 active contracts	~6,000 SOST	5.8% of annual intake
1,000 contracts	~30,000 SOST	29% of annual intake
30-year total pool	~1,167,300 SOST + slash income

Prove Your Gold.Earn Your Reward.

What Is PoPC

Model A — Self-Custody Bonds

1. Declare

2. Bond

3. Commit

4. Audit

5. Reward

Model B — Timelocked Escrow

1. Deposit

2. Receive

3. Wait

4. Withdraw

Reward Structures

Fee Structure

Reputation System

Slashing Mechanics

Custody Violation

50/50 Distribution

Epoch 2 Activation

Prove Your Gold.
Earn Your Reward.