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Issuer Node Core API

The Issuer Node Core API is ideal for users who need multiple identities and for integrator profiles, who want to create solutions based on Polygon ID functionalities and might be interested in having access to low level information such as Merkle Trees.


Issuer Node Core API with Identity, Claim and Agent endpoints.

Issuer Node Components

The Issuer Node comprises the following components and each one of these components can be either dockerized or each one of these can be launched as separate service.

  • Issuer Application to issue Verifiable Credentials and communicate with users' wallets.

  • Vault: Based on HashiCorp, the Vault is used in the Issuer Node for providing key management services. It helps to secure sensitive data, such as the private key of the issuer, thus protecting them in a secure way. The Vault has been provided with a plugin called vault-plugin-secrets-iden3; this plugin is used to sign the data with Baby Jubjub Keys that are stored in the Vault.

  • Redis: Redis is used for caching the schemas that we use in the Issuer Node. The schemas are downloaded from IPFS and stored on Redis. This way, every time, the Issuer Node issues a Credential, it doesn't need to fetch the schemas from an external source; it can fetch it directly from Redis. This boosts the performance of the application.

  • DB: This container is used as the data source for the Issuer Node. In our implementation of the Issuer Node, we have used Postgres as the database. It is where all the data related to issued credentials are stored.


In a testing environment, you can run the Vault, Redis, and Postgres services inside a docker. But for production, you are advised to secure these services first before using them.


Issuer Node Core API architecture.