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34 lines
1010 B
34 lines
1010 B
2 years ago
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# Retrieve transaction value
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### Instructions
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Targeting a local bitcoin node, create a function `retrieveTransactionValue()` that takes as input a hash of a simple transaction, and returns the total value transferred in this transaction in bitcoins. If several outputs are sent, the value should be summed up.
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The Bitcoin node RPC interface is expected to be running with the following parameters:
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```bash
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rpcallowip=127.0.0.1
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rpcport=18443
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rpcuser=leeloo
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rpcpassword=multipass
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```
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### Usage
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```js
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const { retrieveTxValue } = require("./retrieveTransactionValue.js");
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retrieveTxValue(
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"d030023d96b9170af9ec2fe5d9b62a5eacbcbf144c68f3f45d68bca72d1d3649"
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); // Expected : 50
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```
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### Hint
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Internally, Bitcoin uses satoshis, 1 satoshi = 10^-8 bitcoin
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### Notions
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- [Node.js https module](https://nodejs.org/api/https.html)
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- [Async function in Javascript](https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Statements/async_function)
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- [satoshi](<https://en.bitcoin.it/wiki/Satoshi_(unit)>)
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