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The following code allows me to query a Datum from the blockchain using Lucid and Blockfrost:

import { Blockfrost, Lucid } from "https://deno.land/x/[email protected]/mod.ts";

const lucid = await Lucid.new(
  new Blockfrost(
    "https://cardano-preview.blockfrost.io/api/v0",
    <your BLOCKFROST_API_KEY>
  ),
  "Preview"
);

const nft = "b7e0e70f653f23abc39d16f6f6be16fd72e3fe3030db9b16cecccf68524549545f5354415445";  // example

const utxo = await lucid.utxoByUnit(nft);
const datum = utxo.datum
console.log(datum);

The output to the console, for this example, is:

d8799f1903e819f80c1903e81903e8ff

My question now is, what command in Lucid allows me to deserialize this output? I don't even know what kind of encoding I am dealing with (I suspect it is CBOR).

By the way, I know that the desired deserialization, for this example, should be:

{
   constructor: 0,
   fields: [
      {
         int: 1000
      },
      {
         int: 63500
      },
      {
         int: 1000
      },
      {
         int: 1000
      }
   ]
}

1 Answer 1

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I figured out that the Lucid command that does the trick is Data.from. First, in the original code, I need to add Data in the list of imports:

import { Blockfrost, Lucid, Data, } from "https://deno.land/x/[email protected]/mod.ts";

Then simply add:

const solution = Data.from(datum);
console.log(solution);

at the end of the original code.

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  • Still it would be nice to know if it is indeed CBOR the encoding from which Data.from deserializes.
    – a_juggler
    Commented Sep 16, 2023 at 17:57

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