# Polygon ID (PID)

### Jargon

* **Self-sovereign identity (SSI)**: an approach to digital identity that gives individuals control over the information they use to prove who they are to websites, services, and applications across the web - from [Wikipedia](https://en.wikipedia.org/wiki/Self-sovereign_identity), note that this proof doesn't have to be a zk proof.
* **Decentralized identifiers (DIDs)**: new type of identifier that enables verifiable, decentralized digital identity - from [W3](https://www.w3.org/TR/did-core/#abstract). Example of DID in PID: **did:polygonid:polygon:mumbai:2qCw49YgLL9kpG53stfBLMY8Zg5yn2ndDa3JxqMK4P**


### Polygon ID intro

*From the interactive tutorial linked above.*

In this video (sorry, login needed), Sebas provides a [summary of Polygon Id tools](https://vimeo.com/780353263?signup=true):

* [Identity server](https://0xpolygonid.github.io/tutorials/issuer/issuer-overview/): an API for issuers
* To operate, an Issuer must interact with the <a href="https://platform-test.polygonid.com/">Polygon ID Platform</a>, either using the no-code User Interface or through the <a href="../platform-api/introduction/">Platform API</a>.

* [Wallet](https://0xpolygonid.github.io/tutorials/wallet/wallet-overview/): Polygon ID/SDK for a quick start/custom wallet
* [Verifier SDK (JS/Go)](https://0xpolygonid.github.io/tutorials/verifier/verifier-overview/): can be added to apps and dApps (on-chain verification via smart contracts)


Polygon ID Fast Facts:

- Uses blockchain only as a means of storage.
- Not reliant on the Polygon blockchain - can be used with any EVM compatible chain.
- Free for the verifier when off-chain. Issuers and verification on-chain need to pay gas fees.

Other conclusions (from Lesson 12):

- Polygon Id can work with ZK and non-ZK credentials (the latter, based on DID standard)
- The verifier can verify ZK credentials
- The verifier can take 'elaborated queries, like "prove that your are older than 18 and citizen of UK"'
- Passwordless login (? does this refer to the wallet)

*By the end of the tutorial, they make a number of statements. But like they say, Polygon Id is a toolset, therefore it is hard match tool -> statements...*

### Polygon Id Issuer platform



Each schema (which is like a certificate template) seems to only accept 2 attributes, at least from this given frontend. Attributes can only be of type `Date`, `Number`, `Boolean`.




And as you can see QRs don't support dark mode :grin:

To deep-dive, please continue here [https://0xpolygonid.github.io/tutorials/issuer/platform-api/flow-tutorial/happy-path/](https://0xpolygonid.github.io/tutorials/issuer/platform-api/flow-tutorial/happy-path/) :)

### Polygon Id Wallet


- Downloaded app from Store
- Asks for pin (pin or fingerprint) to lock/unlock
- Provides backup
- Scanning the QR was not too straight fw
- Adding the claim failed the first time
- Can someone else try to scan and add the claim above?

### Polygon Id Verifier

The Verifier is an application that requests a certain Claim/Verified Credencial and verifies if it is valid. When a User/Service wants to access the Verifiers resources, the verifier performs some steps in order to allow access to its resources.

[Verifier's Verification flow (off-chain)](https://0xpolygonid.github.io/tutorials/verifier/verification-library/verifier-library-intro/)

### Resources

* The apps were updated in their respective stores on Feb, 16th.

* [PolygonID spec](https://docs.iden3.io/protocol/spec/)

* [PolygonID interactive tutorial, part 1](https://rise.articulate.com/share/6Ek8tj0DkPTQBOQHA5tG9uWT3n58ofQE#/)

* [PolygonID tutorial, part 2](https://rise.articulate.com/share/q9H6bMVuhn41hC_ZRQpfu5FiOTJiYbAS#/)

* [Issuer API Reference](https://0xpolygonid.github.io/tutorials/issuer-node/issuer-node-api/identity/apis/)

* More tutorials [here](https://0xpolygonid.github.io/tutorials/) and [here](https://docs.iden3.io/)

* [Issuer v2](https://issuer-v2.polygonid.me/)

* [Verifier v2](https://verifier-v2.polygonid.me/)

* Repositories:
* [0xPolygonID](https://github.com/0xPolygonID)
* https://github.com/0xPolygonID/tutorials
* https://github.com/0xPolygonID/tutorial-examples
* https://github.com/iden3/docs
* https://github.com/0xPolygonID/contracts
* https://github.com/iden3/js-iden3-auth (Verifier SDK JS)
* https://github.com/iden3/go-iden3-auth (Verifier SDK Go)
* https://github.com/0xPolygonID/rapidsnark
* https://github.com/0xPolygonID/witnesscalc
* [iden3](https://github.com/iden3)
* https://github.com/iden3/contracts
* https://github.com/iden3/circuits
* https://github.com/iden3/polygonid-flutter-sdk (Wallet SDK - supports Mobile apps only)
* https://github.com/0xPolygonID/sh-id-platform (Identity Server - ran by Issuers)
* https://github.com/0xPolygonID/js-sdk (Beta version for the wallet-sdk for Web Services - [Tutorial](https://0xpolygonid.github.io/js-sdk-tutorials/))
* https://github.com/0xPolygonID/phase2ceremony
* https://github.com/iden3/js-jsonld-merklization
* https://github.com/iden3/js-crypto
* https://github.com/iden3/js-merkletree
* https://github.com/iden3/js-jwz
* https://github.com/iden3/js-iden3-core
* https://github.com/iden3/claim-schema-vocab/tree/main/schemas (Existing schemas)
* https://github.com/iden3/claim-schema-vocab/tree/main/credentials (Schemas doc)

* [Issuer demo](https://issuer-demo.polygonid.me/)
* [Verifier demo](https://verifier-demo.polygonid.me/)

* [Notion](https://www.notion.so/polygontechnology/Training-5e3bc80ff61049c9ad8f4cb7c6f18fbc)

* NEW [PID Presentation for DID WG](https://docs.google.com/presentation/d/1pYzvk_1M-wXs-T8tztaNnIR5Vg6dOdr7/edit#slide=id.p13) - shared by Otto, this presentation covers ZK identity

* NEW [Polygon ID DID Method today at Ethereum DID-ETH working group](https://youtu.be/WNJbTfD8ong?t=214) - also shared by Otto, Sasha 1h presentation