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59 lines
2.6 KiB
Markdown
59 lines
2.6 KiB
Markdown
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##InstantSend Technical Information
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InstantSend has been integrated into the Core Daemon in two ways:
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* "push" notifications (ZMQ and `-instantsendnotify` cmd-line/config option);
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* RPC commands.
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####ZMQ
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When a "Transaction Lock" occurs the hash of the related transaction is broadcasted through ZMQ using both the `zmqpubrawtxlock` and `zmqpubhashtxlock` channels.
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* `zmqpubrawtxlock`: publishes the raw transaction when locked via InstantSend
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* `zmqpubhashtxlock`: publishes the transaction hash when locked via InstantSend
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This mechanism has been integrated into Bitcore-Node-Dash which allows for notification to be broadcast through Insight API in one of two ways:
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* WebSocket: [https://github.com/dashpay/insight-api-dash#web-socket-api](https://github.com/dashpay/insight-api-dash#web-socket-api)
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* API: [https://github.com/dashpay/insight-api-dash#instantsend-transactions](https://github.com/dashpay/insight-api-dash#instantsend-transactions)
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####Command line option
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When a wallet InstantSend transaction is successfully locked a shell command provided in this option is executed (`%s` in `<cmd>` is replaced by TxID):
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```
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-instantsendnotify=<cmd>
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```
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####RPC
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Details pertaining to an observed "Transaction Lock" can also be retrieved through RPC, it’s important however to understand the underlying mechanism.
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By default, the Dash Core daemon will launch using the following constant:
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```
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static const int DEFAULT_INSTANTSEND_DEPTH = 5;
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```
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This value can be overridden by passing the following argument to the Dash Core daemon:
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```
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-instantsenddepth=<n>
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```
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The key thing to understand is that this value indicates the number of "confirmations" a successful Transaction Lock represents. When Wallet RPC commands are performed (such as `listsinceblock`) this attribute is taken into account when returning information about the transaction. The value in `confirmations` field you see through RPC is showing the number of `"Blockchain Confirmations" + "InstantSend Depth"` (assuming the funds were sent via InstantSend).
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There is also a field named `bcconfirmations`. The value in this field represents the total number of `"Blockchain Confirmations"` for a given transaction without taking into account whether it was InstantSend or not.
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**Examples**
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* InstantSend transaction just occurred:
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* confirmations: 5
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* bcconfirmations: 0
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* InstantSend transaction received one confirmation from blockchain:
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* confirmations: 6
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* bcconfirmations: 1
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* non-InstantSend transaction just occurred:
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* confirmations: 0
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* bcconfirmations: 0
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* non-InstantSend transaction received one confirmation from blockchain:
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* confirmations: 1
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* bcconfirmations: 1
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