Author: PolyFlow
The call for mass adoption of cryptocurrencies has persisted for years, but blockchain remains an isolated island, difficult to integrate into daily digital life. Even with Web3's powerful tools and infrastructure, most users are still stuck on Web2's centralized platforms, passively accepting data control, creating fragmented information silos. Web3's promise of "user-controlled data" remains unfulfilled, as it has been unable to reasonably utilize real-world data while guaranteeing privacy and avoiding new intermediaries.
Now, PolyFlow's PID, through zero-knowledge proof (ZKP) and Attestation Service technology, enables data from Web2 centralized platforms to be used on-chain, while also providing a bridge for Web3 applications to "move off-chain".
As an all-in-one consumer crypto payment infrastructure, PolyFlow is committed to connecting on-chain assets with off-chain life, starting with smooth crypto payments and extending to on-chain finance and more scenarios in the future. PID is the core infrastructure on this path.
Why is PID Important?
Decentralized Identity (DID) is an innovative model where users create a DID document by generating public-private key pairs and storing them on decentralized networks like blockchain, returning identity control from platforms to users, achieving "self-sovereign identity".
In PolyFlow's PID system, users bind various credentials to their DID and store them as Verifiable Credentials (VCs), ensuring privacy verification while ensuring that asset and identity data belong to the user.
PID is a DID customized for payment scenarios, bridging real-world identity with crypto wallets, helping users store, verify, and manage real-world data in digital credentials, meeting compliance requirements while protecting privacy, truly achieving "data self-control".
PolyFlow co-founder Raymond says: "PID is like your physical wallet, containing cash, documents, cards, and various credentials."
Based on this concept, PID has broad application prospects and will become an important infrastructure in digital life.
Redefining Crypto Wallets
Currently, most crypto wallets are only used to store assets, but with the gradual popularization of stablecoins and crypto payments, this is far from enough. For example: boarding a flight to Token2049 requires identity proof, drinking at a bar needs age verification - these credentials are typically stored in a physical wallet, not a crypto wallet.
PID, using zero-knowledge proof (ZKP) and Attestation Service (AS) technology, gives wallets "storage and verification" functions, becoming not just an asset container, but a digital identity carrier that meets multi-scenario daily life needs.
With PID, wallets will have the following core functions:
Verifiable Credentials (VCs)
Digital credentials issued by trusted institutions, which users can hold and display as needed, verifying identity, credit scores, SIM binding, etc., without exposing unnecessary information, achieving on-chain identity management.
Privacy-protected data verification
Using ZKP technology, users can prove they meet KYC, have good credit, or have a real-name SIM, without revealing specific data, reducing privacy leakage risks.
Cross-scenario payment and access control
Wallets can integrate permission credentials, adapting to different scenarios' payment, identity authentication, reward collection, device authorization, and other needs, truly connecting identity and payment functions.
Enhanced real-world mapping
As the VC ecosystem improves, wallets will gradually acquire all functions of physical wallets, and even surpass them, becoming the primary digital identity portal for Web3 users.
Essentially, PID upgrades crypto wallets from mere asset storage tools to trustworthy, privacy-friendly identity credential carriers that can meet users' daily payment, identity verification, and access authorization needs, paving the way for cryptocurrency adoption.
Application Scenario - SIM Real-name Verification
Traditional eSIM or credit card applications often require independent KYC processes. PID uses verifiable credentials to achieve cross-platform identity verification, reducing compliance costs.
At PolyFlow, we integrate Solana Attestation Service (SAS), putting transaction credentials and user identities on-chain, ensuring every payment and identity verification is traceable, verifiable, and tamper-proof.
Combining PID and SAS, PolyFlow supports ROAM (a DePIN open wireless network based on OpenRoaming and eSIM) in issuing and verifying on-chain SIM real-name credentials.
After completing KYC once, users applying for a ROAM phone card only need to verify the on-chain credentials to complete SIM issuance, avoiding repeated authentication, reducing fraud risks, and achieving decentralized, privacy-friendly real-name verification.
In the future, PID + SAS can support more scenarios:
DeFi lending and credit scoring
Writing users' on-chain credit behaviors (repayment, collateral, etc.) into PID credentials, allowing lending protocols to directly call real-time, trustworthy credit scores.
Supply chain financial credentials
Putting invoice, warehouse receipt, and bill of lading authenticity credentials on-chain via SAS, helping financiers lend faster and reducing trade finance fraud risks.
Moreover, using ZKP technology, PID achieves privacy-protected verification, such as confirming "over 18" without revealing the entire identity document, ensuring compliance and privacy win-win.
Call to Action
To truly bring cryptocurrency into public life, we must solve its adaptation problem in the existing internet ecosystem. PID is this bridge, leveraging real-world data, guaranteeing privacy, and providing decentralized verification, building a composable identity infrastructure for Web3.
PID not only reshapes crypto wallets but also redefines the boundaries between Web2 and Web3. In the future, new applications based on verifiable interactions will emerge, enhancing user control, reducing interaction friction, and accelerating value release.
PID is more than a protocol; it's digital infrastructure that reconstructs information flow and trust establishment. PolyFlow will soon launch multiple PID-related tasks on its DAPP, inviting everyone to explore PID application scenarios, stay tuned.
About PolyFlow
PolyFlow is the first modular PayFi infrastructure, dedicated to connecting real-world assets (RWA) with decentralized finance (DeFi). As the PayFi network infrastructure layer, PolyFlow integrates traditional payments, crypto payments, and DeFi, decentralizedly handling real payment scenarios. PolyFlow provides the infrastructure needed to build PayFi scenarios, ensuring compliance, security, and seamless real-world asset integration, helping to construct a new financial paradigm and industry standards.
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