Indy 4 Walkthrough

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Indy Walkthrough A Developer Guide for Building Indy Clients Using Libindy.What Indy and Libindy are and Why They MatterIndy provides a software ecosystem for private, secure, and powerful identity, and libindy enables clients for it. Indy puts people — not the organizations that traditionally centralize identity — in charge of decisions about their own privacy and disclosure. This enables all kinds of rich innovation: connection contracts, revocation, novel payment workflows, asset and document management features, creative forms of escrow, curated reputation, integrations with other cool technologies, and so on.Indy uses open-source, distributed ledger technology. These ledgers are a form of database that is provided cooperatively by a pool of participants, instead of by a giant database with a central admin.

Data lives redundantly in many places, and it accrues in transactions orchestrated by many machines. Strong, industry-standard cryptography protects it. Best practices in key management and cybersecurity pervade its design. The result is a reliable, public source of truth under no single entity’s control, robust to system failure, resilient to hacking, and highly immune to subversion by hostile entities.If the concepts of cryptography and blockchain details feel mysterious, fear not: this guide will help introduce you to key concepts within Indy. You’re starting in the right place. # Steward Agent nymrequest = await ledger. Buildnymrequest( steward 'did', steward 'faberinfo' 'did',steward 'faberinfo' 'verkey', None, 'TRUSTANCHOR')await ledger.

Walkthrough

Signandsubmitrequest( steward 'pool', steward 'wallet', steward 'did', nymrequest)At this point Faber has a DID related to his identity in the Ledger.Acme, Thrift Bank, and Government must pass the same process of getting Verinym. Step 5: Credential Schemas SetupCredential Schema is the base semantic structure that describes the list of attributes which one particular Credential can contain.Note: It's not possible to update an existing Schema. So, if the Schema needs to be evolved, a new Schema with a new version or name needs to be created.A Credential Schema can be created and saved in the Ledger by any Trust Anchor.Here is where the Government creates and publishes the Transcript Credential Schema to the Ledger:.The Trust Anchor creates the Credential Schema by calling the anoncreds.issuercreateschema that returns the generated Credential Schema. # Faber Agent getschemarequest = await ledger. Buildgetschemarequest( faber 'did', transcriptschemaid)getschemaresponse = await ledger. Submitrequest( faber 'pool', getschemarequest)faber 'transcriptschemaid', faber 'transcriptschema' = await ledger.

Parsegetschemaresponse( getschemaresponse).The Trust Anchor creates the Credential Definition related to the received Credential Schema by calling anoncreds.issuercreateandstorecredentialdef that returns the generated public Credential Definition.The private Credential Definition part for this Credential Schema will be stored in the wallet too, but it is impossible to read it directly. # Alice Agent await anoncreds. Proverstorecredential( alice 'wallet', None, faber 'transcriptcredrequest', faber 'transcriptcredrequestmetadata',alice 'transcriptcred', alice 'transcriptcreddef', None)Alice has it in her possession, in much the same way that she would hold a physical transcript that had been mailed to her. # Acme Agent acme 'jobcertificatecredoffer' = await anoncreds. Issuercreatecredentialoffer( acme 'wallet', acme 'jobcertificatecreddefid')alice 'jobcertificatecredoffer' = acme 'jobcertificatecredoffer'When Alice inspects her connection with Acme, she sees that a new Credential Offer is available. Apply for a LoanNow that Alice has a job, she’d like to apply for a loan. That will require a proof of employment.She can get this from the Job-Certificate credential offered by Acme.Alice goes through a familiar sequence of interactions.

First she creates a Credential Request. # Acme Agent acme 'blobstoragereadercfghandle' = await blobstorage. Openreader( 'default', acme 'tailswriterconfig')acme 'jobcertificatecred', acme 'jobcertificatecredrevid', acme 'alicecertrevregdelta' = await anoncreds. Issuercreatecredential( acme 'wallet', acme 'jobcertificatecredoffer',acme 'jobcertificatecredrequest',acme 'jobcertificatecredvalues',acme 'revocregid',acme 'blobstoragereadercfghandle')alice 'jobcertificatecred' = acme 'jobcertificatecred'Furthermore Acme must publish a revocation registry entry on the Ledger so other parties can verify later the revocation state of the credential. # Alice Agent alice 'acmerevocregdesreq' = await ledger. Buildgetrevocregdefrequest( alice 'didforacme',alicejobcertificatecred 'revregid')alice 'acmerevocregdesresp' = await ledger. Submitrequest( alice 'pool', alice 'acmerevocregdesreq')( alice 'acmerevocregdefid', alice 'acmerevocregdefjson') = await ledger.

Parsegetrevocregdefresponse( alice 'acmerevocregdesresp')Now the Job-Certificate Credential has been issued and Alice now has it in her possession. Alice stores Job-Certificate Credential in her wallet. # Alice Agent await anoncreds. Proverstorecredential( alice 'wallet', None, alice 'jobcertificatecredrequestmetadata',alice 'jobcertificatecred', alice 'acmejobcertificatecreddef', alice 'acmerevocregdefjson')She can use it when she applies for her loan, in much the same way that she used her transcript when applying for a job.There is a disadvantage in this approach to data sharing though, — it may disclose more data than what is strictly necessary. If all Alice needs to do is provide proof of employment, this can be done with an anonymous credential instead. Anonymous credentials may prove certain predicates without disclosing actual values (e.g., Alice is employed full-time, with a salary greater than X, along with her hire date, but her actually salary remains hidden).

A compound proof can be created, drawing from credentials from both Faber College and Acme Corp, that discloses only what is necessary.Alice now establishes connection with Thrift Bank.Alice gets a Loan-Application-Basic Proof Request from Thrift Bank that looks like. # Alice Agent alice 'applyloanproof' = await anoncreds. Provercreateproof( alice 'wallet', alice 'applyloanproofrequest',alice 'applyloanrequestedcreds', alice 'mastersecretid',alice 'schemasforloanapp', alice 'creddefsforloanapp',alice 'revocstatesforloanapp')thrift 'applyloanproof' = alice 'applyloanproof'Alice sends just the Loan-Application-Basic proof to the bank.This allows her to minimize the PII (personally identifiable information) that she has to share when all she's trying to do right now is prove basic eligibility.When Thrift inspects the received Proof he will see following structure. # Acme Agent await anoncreds. Issuerrevokecredential( acme 'wallet',acme 'blobstoragereadercfghandle',acme 'revocregid',acme 'jobcertificatecredrevid')Acme then just needs to publish the revocation on the ledger calling ledger.buildrevocregentryrequest and ledger.signandsubmitrequest.If Alice tries to apply for a loan ( Loan-Application-Basic) again, the proof verification will then fail. Explore the CodeNow that you've had a chance to see how the Libindy implementation works from the outside, perhaps you'd like to see how it works underneath, from code?If so, please run.You may need to be signed into GitHub to view this link.Also you can find the source codeIf demo gives an error when executing check.