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[ aws . qldb ]

get-digest

Description

Returns the digest of a ledger at the latest committed block in the journal. The response includes a 256-bit hash value and a block address.

See also: AWS API Documentation

See 'aws help' for descriptions of global parameters.

Synopsis

  get-digest
--name <value>
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Options

--name (string)

The name of the ledger.

--cli-input-json (string) Performs service operation based on the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, the CLI values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally.

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command.

See 'aws help' for descriptions of global parameters.

Examples

To get a digest for a ledger

The following get-digest example requests a digest from the specified ledger at the latest committed block in the journal.

aws qldb get-digest \
    --name vehicle-registration

Output:

{
    "Digest": "6m6BMXobbJKpMhahwVthAEsN6awgnHK62Qq5McGP1Gk=",
    "DigestTipAddress": {
        "IonText": "{strandId:\"KmA3ZZca7vAIiJAK9S5Iwl\",sequenceNo:123}"
    }
}

For more information, see Data Verification in Amazon QLDB in the Amazon QLDB Developer Guide.

Output

Digest -> (blob)

The 256-bit hash value representing the digest returned by a GetDigest request.

DigestTipAddress -> (structure)

The latest block location covered by the digest that you requested. An address is an Amazon Ion structure that has two fields: strandId and sequenceNo .

IonText -> (string)

An Amazon Ion plaintext value contained in a ValueHolder structure.