> For the complete documentation index, see [llms.txt](https://docs.cheqd.io/product/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.cheqd.io/product/sdk/veramo/dids/update-did.md). # Update an existing DID Update an existing Decentralized Identifier (DID) on cheqd using Veramo. Follow these instructions to update an existing `did:cheqd` entry on cheqd ledger. > ⚠️ **Before you begin...** > > Make sure you've correctly [configured the cheqd plugin's agent settings](/product/sdk/veramo/setup.md) for Veramo CLI ## Instructions ### 1. Prepare DIDDoc contents Before updating the DID, you will need to prepare the updated DIDDoc and parameters for the transaction in an `payload.json` file. This file can be saved whereever you choose, but the location must be specified in the [create DID command used in Step 2](/product/sdk/veramo/dids/create-did.md). (By default, it will be saved under the project root directory.) #### Parameters * `kms` (default `local`): Key Management System (KMS) to be used for storage. * `did`: The `did` that resolves to your `DIDDoc`. * `alias`: A human-friendly alias for the DID. Only used locally when referencing operations in Veramo CLI. * `document`: Full body of the DID Document *including* updated sections. * `versionId`: (optional) Custom versionId for the DID Document. If this is not set manually, then a UUID will be automatically generated for the DID Document version. * `keys`: Keys used to sign the DIDDoc. These must match the ones specified in the DIDDoc, otherwise an error will be thrown. * `fee` * `amount`: An array of coins, coins are represented as an object with 2 fields * `denom`: ncheq (smallest denomination classification) * `amount`: **25000000000** (This is **25 CHEQ by default** and will not work with a different value) * `gas`: Each transaction must specify the maximum amount of gas it may consume. * `payer` (optional): The cheqd fee payer address * `granter` (optional): The cheqd fee granter address, Provided the grantee has an allowance by the granter > Note that transaction fees are paid by the cheqd account set in the `agent.yml` configuration file, [setup here](/product/sdk/veramo/setup.md). Each of cheqd's on-ledger identity transactions has a **fixed fee,** [the pricing for cheqd DIDs and DID-Linked Resources can be found here](https://docs.cheqd.io/node/architecture/adr-list/adr-005-genesis-parameters#cheqd-module-did-module). If your account has insufficient balance the transaction will fail. ### 2. Update existing DID Use the command below to construct and broadcast update transaction. So, let's try to update `service` section of our `DIDDoc`. Then, your `payload.json` file will look like this. ```json { "kms": "local", "alias": "update-my-did", "did": "did:cheqd:testnet:3e6bd814-6851-4c8a-b114-c64f035ef590", "document": { "context": [], "id": "did:cheqd:testnet:3e6bd814-6851-4c8a-b114-c64f035ef590", "controller": ["did:cheqd:testnet:3e6bd814-6851-4c8a-b114-c64f035ef590"], "verificationMethod": [ { "id": "did:cheqd:testnet:3e6bd814-6851-4c8a-b114-c64f035ef590#key-1", "type": "Ed25519VerificationKey2020", "controller": "did:cheqd:testnet:3e6bd814-6851-4c8a-b114-c64f035ef590", "publicKeyMultibase": "z6Mkf5rGMoatrSj1f4CyvuHBeXJELe9RPdzo2PKGNCKVtZxP" } ], "authentication": [ "did:cheqd:testnet:3e6bd814-6851-4c8a-b114-c64f035ef590#key-1" ], "service": [ { "id": "did:cheqd:testnet:3e6bd814-6851-4c8a-b114-c64f035ef590#linked-domain", "type": "LinkedDomains", "serviceEndpoint": ["https://cheqd.io/"] } ], "assertionMethod": [], "capabilityInvocation": [], "capabilityDelegation": [], "keyAgreement": [], "alsoKnownAs": [], }, "versionId": "", // optional "keys": [ { "publicKeyHex": "074035480cdcf09c33b1e8066deb55c75822c8c3b27f1c100717eb413bc08e06", "privateKeyHex": "84ecb7d289dd5c5e82071f8a16503ba5d7b5b3174a619186f430918a6ab00e3b074035480cdcf09c33b1e8066deb55c75822c8c3b27f1c100717eb413bc08e06", "kid": "074035480cdcf09c33b1e8066deb55c75822c8c3b27f1c100717eb413bc08e06", "type": "Ed25519" } ], "fee": { "amount": [{ "denom": "ncheq", "amount": "25000000000" }], "gas": "400000", "payer": "cheqd1rnr5jrt4exl0samwj0yegv99jeskl0hsxmcz96" } } ``` Note, that we are updating a `service` section of in our `DIDDoc`. After you have updated the `payload.json` file, run the command below to update the `did`: ```bash veramo execute -m cheqdUpdateIdentifier --argsFile path/to/payload.json ``` If you would like to fetch the updated DIDDoc body following the successful DID update result, execute the `resolve` command as outlined [here](/product/sdk/veramo/dids/query-did.md). You can check if `service` section of `DIDDoc` has been updated. ## Next steps DID update operations can be complicated, especially when changing or updating keys, using multiple keys etc. Understand the [design of the cheqd DID method](/product/architecture/adr-list/adr-001-cheqd-did-method.md) and [*Verification Relationships* in the W3C DID Core specification](https://w3c.github.io/did-core/#verification-relationships) to understand the logic that is applied in these scenarios. --- # Agent Instructions This documentation is published with GitBook. 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