topaz

topaz-js-sdk

Javascript SDK for Topaz

• API version: 0.2.1
• Package version: 0.2.1

For more information, please visit Topaz.

If you'd like to learn more about the API, view the Topaz API docs.

Getting Started

Philosophy

Topaz makes use of three concepts to secure data on the blockchain: objects, hashes, and proofs.

• objects refer to a specific thing, such as a document, a row in a database, or a signature.

• hashes refer to the hashed state of a specific object over time.

• proofs refer to the cryptographic proof generated from hashes and stored on the blockchain.

For example, if one wished to create an audit trail for a legal document, one could:

• Create an object representing the legal document nda.pdf.

• Append a hash to the object from the current state of nda.pdf.

• Use the proof associated with that hash to verify the existence and integrity of nda.pdf over time.

Prerequisites

• Download and install the latest version of node.

• Download and install the latest version of yarn or npm.

Installation

Install Topaz via:

yarn add topaz

or

npm install topaz --save

Tutorial

Follow the instructions above, then require topaz in your project. your-api-key and your-app-id can be generated via the Topaz web app.

const topaz = require('topaz')({ apiKey: 'your-api-key', appId: 'your-app-id' });

Topaz uses a combination of cryptography and blockchain technology to secure data. The easiest way to start using Topaz is to use the trust() and verify() helper functions.

trust

This function allows you to secure data on the blockchain via Topaz. It accepts data as input and creates an object and hash representing it.

const valuableData = 'my valuable data';
 
topaz.trust(valuableData).then(console.log);

It should return:

{
  data: 'my valuable data',
  object: {
    appId: 'a91d6514-4ace-4357-baa1-dea2d90e9c21',
    id: '29cb3c6a-eb43-41f0-b5d4-3a8d5a10d276',
    hashes: [{
      id: 'efba09b7-1a10-4673-b5d3-1e42d8715977',
      hash: 'QmRNRBDUT6MvSnA7pRHM7yPT8HMdzEzNHjs57TKNtQo8jQ'
    }]
  }
}

This function optionally takes an object's id as a second parameter.

const valuableData = 'my valuable data';
const objectId = '29cb3c6a-eb43-41f0-b5d4-3a8d5a10d276';
 
topaz.trust(valuableData, objectId).then(console.log);

In this case, trust() will append the hash of valuableData to an object that already exists. This is how Topaz updates the state of an object.

Every Topaz app has a set interval, or period of time it takes for a proof to be created for a hash and secured on the blockchain. Once your app's interval has passed, you can verify your data in real-time against it's associated object in Topaz.

verify

This function allows you to verify data on the blockchain via Topaz. It accepts data and an objectId as input, and returns the verification results of that data.

const valueableData = 'my valuable data';
const objectId = '29cb3c6a-eb43-41f0-b5d4-3a8d5a10d276';
 
topaz.verify(valuableData, objectId).then(console.log);

It should return:

{
  appId: 'a91d6514-4ace-4357-baa1-dea2d90e9c21',
  id: '29cb3c6a-eb43-41f0-b5d4-3a8d5a10d276',
  hashes:[{
    id: 'efba09b7-1a10-4673-b5d3-1e42d8715977',
    hash: 'QmRNRBDUT6MvSnA7pRHM7yPT8HMdzEzNHjs57TKNtQo8jQ',
    proof: {
      id: '41954453-82b6-4885-8938-e4e1ecc2d0c3',
      merkleRoot: 'QmR1XC1rT7Phd6NX3bA219orD4Pt4dmdGKmC5eg74xp42P',
      unixTimestamp: 1556031914,
      appId: 'aea3c236-a1d8-48ed-a174-aceea19839e8',
      hashes: [{
        id: 'efba09b7-1a10-4673-b5d3-1e42d8715977',
        hash: 'QmRNRBDUT6MvSnA7pRHM7yPT8HMdzEzNHjs57TKNtQo8jQ'
      }],
      blockchainTransactions: [{
        blockchainNetwork: "ethereum goerli",
        transactionHash: "0x4f7b12bdc99e10a4abcdff9b1c70b58032fbb4c1ae5c96a1e43e7a63e0123a5b",
        explorers: [
          "https://goerli.etherscan.io/tx/0x4f7b12bdc99e10a4abcdff9b1c70b58032fbb4c1ae5c96a1e43e7a63e0123a5b",
          "https://blockscout.com/eth/goerli/tx/0x4f7b12bdc99e10a4abcdff9b1c70b58032fbb4c1ae5c96a1e43e7a63e0123a5b/internal_transactions"
        ]
      }]
    }
  }],
  verified: 'latest'
}

This response will return all of the proofs that contain the hash of the data input into the verify() function. This is all of the information needed to verify the existence of data at a point in time. For more information on proofs, view the Topaz API docs.

Advanced Functionality

The Topaz JavaScript SDK also provides convenient methods for each of the Topaz API endpoints.

All functions support JavaScript promises and callbacks, which can be added as the last parameter in a function call.

objects

objects.create

This function creates a new object.

topaz.objects.create().then(console.log);

or

topaz.objects.create(console.log);

should return:

{
  appId: '431ca6dc-0ad0-4b66-a13c-59f7967b664a',
  id: 'a3a5709f-6d55-4757-b2cf-13acc20c04a2',
  hashes: []
}

objects.find

This function returns all of the objects associated with your app.

topaz.objects.find().then(console.log);

or

topaz.objects.find(console.log);

should return:

[
  {
    appId: '88ec6e52-65ed-483a-b507-bc51ec4d3ab4',
    id: 'cc73133c-f666-4590-a00d-f240f771beb9'
  },
  {
    appId: '88ec6e52-65ed-483a-b507-bc51ec4d3ab4',
    id: '61428921-089f-4e07-8478-ccb34d95b9d5'
  }
]

objects.get

This function returns a single object.

const objectId = '8535ce2b-f4d8-49fe-b1ab-aa389af3b377';
 
topaz.objects.get(objectId).then(console.log);

or

const objectId = '8535ce2b-f4d8-49fe-b1ab-aa389af3b377';
 
topaz.objects.get(objectId, console.log);

should return:

{
  appId: 'b4ea626a-0730-43da-ae19-239a895d58d5',
  id: '8535ce2b-f4d8-49fe-b1ab-aa389af3b377',
  hashes: []
}

hashes

hashes.create

This function appends a new hash to an object.

To create a new hash manually, you'll need to convert your data to a Base58 encoded multihash.

Learn more about multihash here.

The Topaz JavaScript SDK includes a utility function that takes binary-like data and returns a Base58 encoded multihash.

const dataHash = topaz.utils.hash('my valuable data');

You can now use dataHash as input to create a new Topaz hash.

const objectId = '8535ce2b-f4d8-49fe-b1ab-aa389af3b377';
topaz.hashes.create(objectId, { hash: dataHash }).then(console.log);

or

const objectId = '8535ce2b-f4d8-49fe-b1ab-aa389af3b377';
topaz.hashes.create(objectId, { hash: dataHash }, console.log);

should return:

{
  hash: 'QmRNRBDUT6MvSnA7pRHM7yPT8HMdzEzNHjs57TKNtQo8jQ',
  id: '1917b485-c456-4f61-8ef0-b80fd38235db',
  unixTimestamp: 1556036177,
  objectId: '8535ce2b-f4d8-49fe-b1ab-aa389af3b377',
  proofId: null
}

hashes.find

This function returns all of the hashes associated with your app.

const objectId = '8535ce2b-f4d8-49fe-b1ab-aa389af3b377';
 
topaz.hashes.find(objectId).then(console.log);

or

const objectId = '8535ce2b-f4d8-49fe-b1ab-aa389af3b377';
 
topaz.hashes.find(objectId, console.log);

should return:

[
  {
    hash: 'QmRNRBDUT6MvSnA7pRHM7yPT8HMdzEzNHjs57TKNtQo8jQ',
    id: '8d2b9318-968a-4710-af39-1c6b90b803b4',
    unixTimestamp: 1556036303,
    objectId: '8535ce2b-f4d8-49fe-b1ab-aa389af3b377',
    proofId: 'f9959e96-4235-4243-a3a1-b575077a5ae0'
  },
  {
    hash: 'QmW7HtDZYtsB9CM1vmWqbfiTKvqDX6N9G71kaYWimKNyaU',
    id: 'ebe8e364-96f5-4d44-ae18-6054635058c0',
    unixTimestamp: 1556036303,
    objectId: '8535ce2b-f4d8-49fe-b1ab-aa389af3b377',
    proofId: '5f7a7890-2706-4789-bbdc-6c2a58530f87'
  }
]

hashes.get

This function returns a single hash.

const objectId = '8535ce2b-f4d8-49fe-b1ab-aa389af3b377';
const hashId = 'efba09b7-1a10-4673-b5d3-1e42d8715977';
 
topaz.hashes.get(objectId, hashId).then(console.log);

or

const objectId = '8535ce2b-f4d8-49fe-b1ab-aa389af3b377';
const hashId = 'efba09b7-1a10-4673-b5d3-1e42d8715977';
 
topaz.hashes.get(objectId, hashId, console.log);

should return:

{
  hash: 'QmRNRBDUT6MvSnA7pRHM7yPT8HMdzEzNHjs57TKNtQo8jQ',
  id: 'efba09b7-1a10-4673-b5d3-1e42d8715977',
  unixTimestamp: 1556036452,
  objectId: '8535ce2b-f4d8-49fe-b1ab-aa389af3b377',
  proofId: '6e3204d4-8b3c-4057-b30f-5538eaacdf22'
}

proofs

proofs.find

This function returns all of the proofs associated with your app.

topaz.proofs.find().then(console.log);

or

topaz.proofs.find(console.log);

should return:

[
  {
    id: '8c2ae6f9-d26e-49b1-b43d-ad516c87bf51',
    merkleRoot: 'QmR1XC1rT7Phd6NX3bA219orD4Pt4dmdGKmC5eg74xp42P',
    unixTimestamp: 1556036504,
    appId: 'e36355b5-5595-4223-94c7-62d791ae6ed4'
  },
  {
    id: '2949af0a-9a51-4c8a-b15e-06c4dd5afe93',
    merkleRoot: 'QmQQkBSv66afHg4X6TqHMxdYnDyCd47kKWDytHksrydFuG',
    unixTimestamp: 1556037031,
    appId: 'e36355b5-5595-4223-94c7-62d791ae6ed4'
  },
]

proofs.get

This function returns a single proof.

const proofId = '41954453-82b6-4885-8938-e4e1ecc2d0c3';
 
topaz.proofs.get(proofId).then(console.log);

or

const proofId = '41954453-82b6-4885-8938-e4e1ecc2d0c3';
 
topaz.proofs.get(proofId, console.log);

should return:

{
  id: '41954453-82b6-4885-8938-e4e1ecc2d0c3',
  merkleRoot: 'QmR1XC1rT7Phd6NX3bA219orD4Pt4dmdGKmC5eg74xp42P',
  unixTimestamp: 1556031914,
  appId: 'aea3c236-a1d8-48ed-a174-aceea19839e8',
  hashes: [{
    id: 'efba09b7-1a10-4673-b5d3-1e42d8715977',
    hash: 'QmRNRBDUT6MvSnA7pRHM7yPT8HMdzEzNHjs57TKNtQo8jQ'
  }],
  blockchainTransactions: [{
    blockchainNetwork: "ethereum goerli",
    transactionHash: "0x4f7b12bdc99e10a4abcdff9b1c70b58032fbb4c1ae5c96a1e43e7a63e0123a5b",
    explorers: [
      "https://goerli.etherscan.io/tx/0x4f7b12bdc99e10a4abcdff9b1c70b58032fbb4c1ae5c96a1e43e7a63e0123a5b",
      "https://blockscout.com/eth/goerli/tx/0x4f7b12bdc99e10a4abcdff9b1c70b58032fbb4c1ae5c96a1e43e7a63e0123a5b/internal_transactions"
    ]
  }
}

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