Blockchain project 4 Notary service

Star Registry service that allows users to claim ownership of their favorite star.

Framework

Express.js with the help of express generator in this project https://expressjs.com/

Prerequisites

npm
express.js
nodemon
level
crypto-js

Installing

1- npm i

2- npm run start

3. Wallet address

We need a bitcoin wallet address. Use bitaddress.org.

My Wallet address: 19SUr6pdworo9FFouRPnG259dBZSTcBpfB

Run the Project

1. Install the dependencies

Using "npm install xxx" to install some module.

2. Run the project

npm run start

3. Service URL

Service will be available at the following URL:

http://localhost:8000/

Endpoint Documentation

Blockchain ID validation routine

1. Blockchain ID Validation Request

Method

GET

Endpoint

http://localhost:8000/requestValidation

Parameters

address - The bitcoin address

Example

curl -X "POST" "http://localhost:8000/requestValidation" \
     -H 'Content-Type: application/json; charset=utf-8' \
     -d $'{
  "address": "19SUr6pdworo9FFouRPnG259dBZSTcBpfB"
}'

Response Example

{
    "address": "19SUr6pdworo9FFouRPnG259dBZSTcBpfB",
    "message": "19SUr6pdworo9FFouRPnG259dBZSTcBpfB:1538519317:starRegistry",
	"requestTimeStamp": 1538520582,
    "validationWindow": 300
}

2. Blockchain ID Message Signature Validation

To get the signature parameter using Electrum Bitcon Wallet: Tools → Sign/verify message. Use address and message parameters that we got from Blockchain ID Validation Request endpoint response.

Method

POST

Endpoint

http://localhost:8000/message-signature/validate

Parameters

address - The bitcoin address that you used
signature - Take it from the Electrum wallet

Example

curl -X "POST" "http://localhost:8000/message-signature/validate" \
     -H 'Content-Type: application/json; charset=utf-8' \
     -d $'{
  "address": "19SUr6pdworo9FFouRPnG259dBZSTcBpfB",
  "signature": "IOd5QK4cDReUOv9NSSvehgG9u+W44+KawXgc4zxHp98XAgQ3+iYYgGrCWsmR5sbh+tmTWhm7Fm10pKHbBv1Ct3U="
}'

Response Example

{
    "registerStar": true,
    "status": {
        "address": "19SUr6pdworo9FFouRPnG259dBZSTcBpfB",
        "message": "19SUr6pdworo9FFouRPnG259dBZSTcBpfB:1537630417820:starRegistry",
		"timeStamp": 1537630417820,
        "validationWindow": 243,
        "messageSignature": "valid"
    }
}

Star registration Endpoint

3. Stars Registration

Method

POST

Endpoint

http://localhost:8000/block

Parameters

address - The bitcoin address that you used
star - Containing dec, ra and story

Example

curl -X "POST" "http://localhost:8000/block" \
     -H 'Content-Type: application/json; charset=utf-8' \
     -d $'{
  "address": "19SUr6pdworo9FFouRPnG259dBZSTcBpfB",
  "star": {
    "dec": "-26° 29'\'' 24.9",
    "ra": "16h 29m 1.0s",
    "story": "Found star using https://www.google.com/sky/"
  }
}'

Response Example

{
    "hash": "2eb83385f12709dbfeb33c67eb25394868d64e3f3e8c05c886320cc21c764916",
    "height": 1,
    "body": {
        "address": "19SUr6pdworo9FFouRPnG259dBZSTcBpfB",
        "star": {
            "dec": "-26° 29'\'' 24.9",
            "ra": "16h 29m 1.0s",
            "story": "466f756e642073746172207573696e672068747470733a2f2f7777772e676f6f676c652e636f6d2f736b792f"
			"storyDecoded": "Found star using https://www.google.com/sky/"
        }
    }
    "time": "1537668090",
    "previousBlockHash": "98db1e26c067711b1ea67606a35aafda8cc26f181d42a1f8586aadc38352977d",
}

Star Lookup

4. Stars Lookup by Wallet Address

Method

GET

Endpoint

http://localhost:8000/stars/address:address

Parameters

address - The bitcoin address that you used

Example

curl "http://localhost:8000/stars/address:19SUr6pdworo9FFouRPnG259dBZSTcBpfB"

Response Example

{
    "hash": "2eb83385f12709dbfeb33c67eb25394868d64e3f3e8c05c886320cc21c764916",
    "height": 1,
    "body": {
        "address": "19SUr6pdworo9FFouRPnG259dBZSTcBpfB",
        "star": {
            "dec": "-26° 29' 24.9",
            "ra": "16h 29m 1.0s",
            "story": "466f756e642073746172207573696e672068747470733a2f2f7777772e676f6f676c652e636f6d2f736b792f",
            "storyDecoded": "Found star using https://www.google.com/sky/"
        }
    }
	"time": "1537668090",
	"previousBlockHash": "98db1e26c067711b1ea67606a35aafda8cc26f181d42a1f8586aadc38352977d",
}

5. Star Lookup by Block Hash

Method

GET

Endpoint

http://localhost:8000/stars/hash:hash

Parameters

hash - The hash of one block created

Example

curl "http://localhost:8000/stars/hash:2eb83385f12709dbfeb33c67eb25394868d64e3f3e8c05c886320cc21c764916"

Response Example

{
    "hash": "2eb83385f12709dbfeb33c67eb25394868d64e3f3e8c05c886320cc21c764916",
    "height": 1,
    "body": {
        "address": "1JhzgwjPp8xGswhfNHvoPmiANTe21r6Wq3",
        "star": {
            "dec": "-26° 29' 24.9",
            "ra": "16h 29m 1.0s",
            "story": "466f756e642073746172207573696e672068747470733a2f2f7777772e676f6f676c652e636f6d2f736b792f",
            "storyDecoded": "Found star using https://www.google.com/sky/"
        }
    }
	"time": "1537668090",
	"previousBlockHash": "98db1e26c067711b1ea67606a35aafda8cc26f181d42a1f8586aadc38352977d",
}

6. Star Lookup by Block Height

Method

GET

Endpoint

http://localhost:8000/block/:height

Parameters

height - The height of block

Example

curl "http://localhost:8000/block/1"

Response Example

{
    "hash": "2eb83385f12709dbfeb33c67eb25394868d64e3f3e8c05c886320cc21c764916",
    "height": 1,
    "body": {
        "address": "1JhzgwjPp8xGswhfNHvoPmiANTe21r6Wq3",
        "star": {
            "dec": "-26° 29' 24.9",
            "ra": "16h 29m 1.0s",
            "story": "466f756e642073746172207573696e672068747470733a2f2f7777772e676f6f676c652e636f6d2f736b792f",
            "storyDecoded": "Found star using https://www.google.com/sky/"
        }
    }
	"time": "1537668090",
	"previousBlockHash": "98db1e26c067711b1ea67606a35aafda8cc26f181d42a1f8586aadc38352977d",
}

If the block wasn't found, it was showed:

{
	"status":404,"message":
	"Block not found"
}

Udacity honor

Udacity Project4 Concepts section

Udacity slack of nanodegree