Prop Trust Verified Standard (PTVS v1.0): Cryptographic Forensic Protocol for Real-World Asset Tokenization

Tamarit Blay, Aurelio

doi:10.5281/zenodo.21719175

PTVS v1.0 Technical Specification / Developer Series

Integrating Forensic Audit Hashes into ERC-3643 and ONCHAINID Frameworks

Published by Forensics Oracle Organization | Target Standard: ERC-3643 / ONCHAINID | Repository: PTVS v1.0 Specification

The ERC-3643 standard (formerly T-REX) provides a permissioned token framework that enforces compliance at the smart contract level using ONCHAINID decentralized identities. While ERC-3643 natively manages investor eligibility (KYC/AML) and jurisdictional rules, verifying the physical and legal integrity of the underlying Real-World Asset (RWA) requires a dedicated Verifiable Claim architecture.

This document outlines the technical specification for binding SHA-256 cryptographic hashes generated from off-chain judicial forensic inspections into ONCHAINID identity contracts, establishing an automated prerequisite for token minting and transfer permissioning under PTVS v1.0.

1. Data Architecture & Cryptographic Hashing

To preserve confidentiality while guaranteeing immutability, raw pericial reports and technical telemetry are not stored directly on-chain. Instead, the off-chain inspection dossier undergoes a multi-layer verification and hashing process:

      // Off-Chain Pre-Processing Pipeline

Inspection Dossier Compilation -> PDF/A + Raw Telemetry

SHA-256 Hash Generation -> Hash_Dossier = 0x7f83b1657ff1fc53b92dc18148a1d65dfc2d4b1fa3d677284addd200126d9069

Registration & Timestamping -> CERN/Zenodo Persistent DOI

ECDSA Signature by Certified Expert -> Secp256k1 Signed Claim

2. ONCHAINID Verifiable Claim Injection

The ERC-3643 ecosystem relies on a ClaimTopicsRegistry and a ClaimIssuer contract. Under PTVS v1.0, the Forensics Oracle acts as a trusted Claim Issuer issuing a specific claim topic:

Claim Topic ID: CLAIM_TOPIC_FORENSIC_AUDIT = 10101 (Custom registered topic for physical property audit).
Claim Data: Contains the SHA-256 hash of the pericial report, the expiration timestamp, and the URI pointing to the public verification endpoint.
Issuer Address: Cryptographic wallet bound to the accredited Judicial Expert ID (Exp. 0161).

Smart Contract Execution Flow:

The Asset Issuer requests a forensic audit prior to tokenizing the real estate asset.
The Forensics Oracle conducts the physical audit and signs the VerifiableClaim.
The claim is registered in the Token’s Asset Identity contract via addClaim().
During mint() or transfer(), the ERC-3643 Compliance contract queries isClaimValid().
If the forensic audit claim is missing, expired, or revoked due to physical damage, the contract reverts the transaction.

3. Pseudocode Interface Example

Below is an illustrative Solidity interface snippet demonstrating how compliance modules query the PTVS audit state prior to authorizing token transfers:

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.20;

interface IClaimIssuer {

    function isClaimValid(

        IIdentity _identity,

        uint256 _claimTopic,

        bytes calldata _sig,

        bytes calldata _data

    ) external view returns (bool);

}

contract PTVSComplianceModule {

    uint256 public constant FORENSIC_TOPIC = 10101;

    function canTransfer(address _from, address _to, uint256 _amount) external view returns (bool) {

        // Verify that the Asset Identity holds an active, unrevoked PTVS v1.0 Forensic Claim

        require(hasValidForensicAudit(_from), “PTVS Error: Physical Asset Audit Invalid or Expired”);

        return true;

    }

}

Developer Tools & API Verification Requests

To test smart contract integrations, query audit hash endpoints, or request custom verification SDK access for live RWA projects, developers can utilize the enterprise integration suite at Prop Trust Verified Developer Portal.