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Overview

Starting with version 1.7, the BDN supports subscribing to a stream of new transactions added to the TxPool and a stream of new transactions seen in the BDN. bloXroute Cloud-API streaming functions the same as bloXroute Gateway streaming. The only difference is that Cloud-API streaming can be used without a Gateway. These messages are sent as JSON-RPC notifications over a websocket connection.

In order to subscribe to the Transaction Stream, you must register an account on the bloXroute website and use a paid tier.

Available Subscriptions
 
Two subscription feeds are currently supported: pendingTxs and newTxs.

  • pendingTxs – stream of all new transactions as they enter the Ethereum TxPool
  • newTxs – stream of all new transactions as they propagated in the BDN

 

For expedience, all transactions received through the BDN are immediately published to the newTxs feed. These transactions have had basic validations done (e.g. checksums and other sanity checks) but may not be accepted into the TxPool.

The bloXroute Gateway will then leverage the BDN for further validation of the transaction (e.g. check that it will be accepted into the TxPool), and publish results to the pendingTxs feed. You can optionally enable validation against your local Ethereum node as well, which may be faster in some scenarios (see the section below).

Both feeds will look like this:

<<< {"jsonrpc": "2.0", "id": null, "method": "subscribe", "params": {"subscription": "909e4bae-2c48-43f3-a007-f17d4c8a3ce8", "result": {"tx_hash": "14f3d7a1553b252b896fa4ea9d0b6ee78c6d4541fa6bfbc7fc664fde3214f3de", "tx_contents": {"from": "0xa7a7899d944fe658c4b0a1803bab2f490bd3849e", "gas": 400000, "gas_price": 50000000000, "hash": "0x14f3d7a1553b252b896fa4ea9d0b6ee78c6d4541fa6bfbc7fc664fde3214f3de", "input": "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", "nonce": 5349614, "to": "0x2a0c0dbecc7e4d658f48e01e3fa353f44050c208", "value": 0, "v": "0x26", "r": "0x56f7c0ed99aed122751ec456ec95fac33694ab95144fc393ca13c36c738c3d27", "s": "0x46ef66da559ab73620bdf9b34e32b5ec680fe038af53e85bffc7094cc55dc0cc"}}}}
<<< {"jsonrpc": "2.0", "id": null, "method": "subscribe", "params": {"subscription": "909e4bae-2c48-43f3-a007-f17d4c8a3ce8", "result": {"tx_hash": "d7a4ed5ce46dc7438649f52e693129bffc1059c55b11e50b389508f9a8bf9ba4", "tx_contents": {"from": "0xcb756522ec37cd247da16aef9d3a44914d639875", "gas": 60000, "gas_price": 38000001235, "hash": "0xd7a4ed5ce46dc7438649f52e693129bffc1059c55b11e50b389508f9a8bf9ba4", "input": "0xa9059cbb0000000000000000000000005cbba25357cb42c6e31d7eb3182372bced8f1e3f00000000000000000000000000000000000000000000001b1ae4d6e2ef500000", "nonce": 198, "to": "0x5f75112bbb4e1af516fbe3e21528c63da2b6a1a5", "value": 0, "v": "0x25", "r": "0x896b5c0224cfbe796810a4ec794f81b4009dee6176bbad86dc67778789568be2", "s": "0x7edd0fc8cc89fa5e81add0d36ff9de76f4c93b03f5b5cdf1c5818856574ef245"}}}}
<<< {"jsonrpc": "2.0", "id": null, "method": "subscribe", "params": {"subscription": "909e4bae-2c48-43f3-a007-f17d4c8a3ce8", "result": {"tx_hash": "0bc3edac5ca5c6bf1b8ba57a088a01a4fddb87a977079d88a458c44cc5b70808", "tx_contents": {"from": "0xa7efae728d2936e78bda97dc267687568dd593f3", "gas": 210000, "gas_price": 56000000000, "hash": "0x0bc3edac5ca5c6bf1b8ba57a088a01a4fddb87a977079d88a458c44cc5b70808", "input": "0x0", "nonce": 107386, "to": "0xd4a41118e72ff8ae1a48e1b2b8883c508ad8f22b", "value": 800000000000000000, "v": "0x1b", "r": "0x4e7f4b46e4dca57d1d7ab98e0f504b6366e1204014940c37dfd55569a59f1fec", "s": "0x6a75f909a678f780ce55b2b628a54df39b64789c702f2cd34a96c199e001f622"}}}}

 

Examples

create subscription

>>> {"id": 1, "method": "subscribe", "params": ["pendingTxs", {"include": ["tx_hash"]}
<<< {"jsonrpc": "2.0", "id": 1", "result": "909e4bae-2c48-43f3-a007-f17d4c8a3ce8"}

notification

<<< {"jsonrpc": "2.0", "id": null, "method": "subscribe", "params": {"subscription": "909e4bae-2c48-43f3-a007-f17d4c8a3ce8", "result": {"tx_hash": "14f3d7a1553b252b896fa4ea9d0b6ee78c6d4541fa6bfbc7fc664fde3214f3de", "tx_contents": {"from": "0xa7a7899d944fe658c4b0a1803bab2f490bd3849e", "gas": 400000, "gas_price": 50000000000, "hash": "0x14f3d7a1553b252b896fa4ea9d0b6ee78c6d4541fa6bfbc7fc664fde3214f3de", "input": "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", "nonce": 5349614, "to": "0x2a0c0dbecc7e4d658f48e01e3fa353f44050c208", "value": 0, "v": "0x26", "r": "0x56f7c0ed99aed122751ec456ec95fac33694ab95144fc393ca13c36c738c3d27", "s": "0x46ef66da559ab73620bdf9b34e32b5ec680fe038af53e85bffc7094cc55dc0cc"}}}}

cancel subscription

>>> {"id": 1, "method": "unsubscribe", "params": "909e4bae-2c48-43f3-a007-f17d4c8a3ce8"}
<<< {"jsonrpc": "2.0", "id": 1", "result": true}