# Insight API

A Bitcoin blockchain REST and web socket API service for [Bitcore Node](https://github.com/bitpay/bitcore-node).

This is a backend-only service. If you're looking for the web frontend application, take a look at https://github.com/bitpay/insight.

## Getting Started

```bash
npm install -g bitcore-node@latest
bitcore-node create mynode
cd mynode
bitcore-node add insight-api
bitcore-node start
```

The API endpoints will be available by default at: 'http://localhost:3001/insight-api/`

## Prerequisites

- [Bitcore Node 0.2.x](https://github.com/bitpay/bitcore-node)

**Note:** You can use an existing Bitcoin data directory, however `txindex` needs to be set to true in `bitcoin.conf`.

## API HTTP Endpoints

### Block
```
  /api/block/[:hash]
  /api/block/00000000a967199a2fad0877433c93df785a8d8ce062e5f9b451cd1397bdbf62
```

### Block index
Get block hash by height
```
  /api/block-index/[:height]
  /api/block-index/0
```
This would return:
```
{"blockHash":"000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f"}
```
which is the hash of the Genesis block (0 height)

### Transaction
```
  /api/tx/[:txid]
  /api/tx/525de308971eabd941b139f46c7198b5af9479325c2395db7f2fb5ae8562556c
  /api/raw/[:rawid]
  /api/raw/525de308971eabd941b139f46c7198b5af9479325c2395db7f2fb5ae8562556c
```

### Address
```
  /api/addr/[:addr][?noTxList=1&noCache=1]
  /api/addr/mmvP3mTe53qxHdPqXEvdu8WdC7GfQ2vmx5?noTxList=1
```

### Address Properties
```
  /api/addr/[:addr]/balance
  /api/addr/[:addr]/totalReceived
  /api/addr/[:addr]/totalSent
  /api/addr/[:addr]/unconfirmedBalance
```
The response contains the value in Satoshis.

### Unspent Outputs
```
  /api/addr/[:addr]/utxo[?noCache=1]
```
Sample return:
``` json
[
    {
      "address": "n2PuaAguxZqLddRbTnAoAuwKYgN2w2hZk7",
      "txid": "dbfdc2a0d22a8282c4e7be0452d595695f3a39173bed4f48e590877382b112fc",
      "vout": 0,
      "ts": 1401276201,
      "scriptPubKey": "76a914e50575162795cd77366fb80d728e3216bd52deac88ac",
      "amount": 0.001,
      "confirmations": 3
    },
    {
      "address": "n2PuaAguxZqLddRbTnAoAuwKYgN2w2hZk7",
      "txid": "e2b82af55d64f12fd0dd075d0922ee7d6a300f58fe60a23cbb5831b31d1d58b4",
      "vout": 0,
      "ts": 1401226410,
      "scriptPubKey": "76a914e50575162795cd77366fb80d728e3216bd52deac88ac",
      "amount": 0.001,
      "confirmation": 6,
      "confirmationsFromCache": true
    }
]
```
Please note that in case confirmations are cached (which happens by default when the number of confirmations is bigger that INSIGHT_SAFE_CONFIRMATIONS) the response will include the pair confirmationsFromCache:true, and confirmations will equal INSIGHT_SAFE_CONFIRMATIONS. See noCache and INSIGHT_IGNORE_CACHE options for details.



### Unspent Outputs for multiple addresses
GET method:
```
  /api/addrs/[:addrs]/utxo
  /api/addrs/2NF2baYuJAkCKo5onjUKEPdARQkZ6SYyKd5,2NAre8sX2povnjy4aeiHKeEh97Qhn97tB1f/utxo
```

POST method:
```
  /api/addrs/utxo
```

POST params:
```
addrs: 2NF2baYuJAkCKo5onjUKEPdARQkZ6SYyKd5,2NAre8sX2povnjy4aeiHKeEh97Qhn97tB1f
```

### Transactions by Block
```
  /api/txs/?block=HASH
  /api/txs/?block=00000000fa6cf7367e50ad14eb0ca4737131f256fc4c5841fd3c3f140140e6b6
```
### Transactions by Address
```
  /api/txs/?address=ADDR
  /api/txs/?address=mmhmMNfBiZZ37g1tgg2t8DDbNoEdqKVxAL
```

### Transactions for multiple addresses
GET method:
```
  /api/addrs/[:addrs]/txs[?from=&to=]
  /api/addrs/2NF2baYuJAkCKo5onjUKEPdARQkZ6SYyKd5,2NAre8sX2povnjy4aeiHKeEh97Qhn97tB1f/txs?from=0&to=20
```

POST method:
```
  /api/addrs/txs
```

POST params:
```
addrs: 2NF2baYuJAkCKo5onjUKEPdARQkZ6SYyKd5,2NAre8sX2povnjy4aeiHKeEh97Qhn97tB1f
from (optional): 0
to (optional): 20
```

Sample output:
```
{ totalItems: 100,
  from: 0,
  to: 20,
  items:
    [ { txid: '3e81723d069b12983b2ef694c9782d32fca26cc978de744acbc32c3d3496e915',
       version: 1,
       locktime: 0,
       vin: [Object],
       vout: [Object],
       blockhash: '00000000011a135e5277f5493c52c66829792392632b8b65429cf07ad3c47a6c',
       confirmations: 109367,
       time: 1393659685,
       blocktime: 1393659685,
       valueOut: 0.3453,
       size: 225,
       firstSeenTs: undefined,
       valueIn: 0.3454,
       fees: 0.0001 },
      { ... },
      { ... },
      ...
      { ... }
    ]
 }
```

Note: if pagination params are not specified, the result is an array of transactions.

### Transaction broadcasting
POST method:
```
  /api/tx/send
```
POST params:
```
  rawtx: "signed transaction as hex string"

  eg

  rawtx: 01000000017b1eabe0209b1fe794124575ef807057c77ada2138ae4fa8d6c4de0398a14f3f00000000494830450221008949f0cb400094ad2b5eb399d59d01c14d73d8fe6e96df1a7150deb388ab8935022079656090d7f6bac4c9a94e0aad311a4268e082a725f8aeae0573fb12ff866a5f01ffffffff01f0ca052a010000001976a914cbc20a7664f2f69e5355aa427045bc15e7c6c77288ac00000000

```
POST response:
```
  {
      txid: [:txid]
  }

  eg

  {
      txid: "c7736a0a0046d5a8cc61c8c3c2821d4d7517f5de2bc66a966011aaa79965ffba"
  }
```

### Historic blockchain data sync status
```
  /api/sync
```

### Live network p2p data sync status
```
  /api/peer
```

### Status of the bitcoin network
```
  /api/status?q=xxx
```

Where "xxx" can be:

 * getInfo
 * getDifficulty
 * getTxOutSetInfo
 * getBestBlockHash
 * getLastBlockHash


### Utility methods
```
  /api/utils/estimatefee[?nbBlocks=2]
```


## Web Socket API
The web socket API is served using [socket.io](http://socket.io).

The following are the events published by insight:

'tx': new transaction received from network. This event is published in the 'inv' room. Data will be a app/models/Transaction object.
Sample output:
```
{
  "txid":"00c1b1acb310b87085c7deaaeba478cef5dc9519fab87a4d943ecbb39bd5b053",
  "processed":false
  ...
}
```


'block': new block received from network. This event is published in the 'inv' room. Data will be a app/models/Block object.
Sample output:
```
{
  "hash":"000000004a3d187c430cd6a5e988aca3b19e1f1d1727a50dead6c8ac26899b96",
  "time":1389789343,
  ...
}
```

'<bitcoinAddress>': new transaction concerning <bitcoinAddress> received from network. This event is published in the '<bitcoinAddress>' room.

'status': every 1% increment on the sync task, this event will be triggered. This event is published in the 'sync' room.

Sample output:
```
{
  blocksToSync: 164141,
  syncedBlocks: 475,
  upToExisting: true,
  scanningBackward: true,
  isEndGenesis: true,
  end: "000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943",
  isStartGenesis: false,
  start: "000000009f929800556a8f3cfdbe57c187f2f679e351b12f7011bfc276c41b6d"
}
```

### Example Usage

The following html page connects to the socket.io insight API and listens for new transactions.

html
```
<html>
<body>
  <script src="http://<insight-server>:<port>/socket.io/socket.io.js"></script>
  <script>
    eventToListenTo = 'tx'
    room = 'inv'

    var socket = io("http://<insight-server>:<port>/");
    socket.on('connect', function() {
      // Join the room.
      socket.emit('subscribe', room);
    })
    socket.on(eventToListenTo, function(data) {
      console.log("New transaction received: " + data.txid)
    })
  </script>
</body>
</html>
```

## License
(The MIT License)

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
'Software'), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.