= Coinbase Bitcoin hello world
{c}
Test buy 2023-04-10 in the <UK>:
* fee: 0.99 pounds, minimum buy: 1.99 pounds
* bought 10 pounds, minus 0.99 fee, totalled: 0.00039162 BTC (£8.92) presumably after further fees/spread
* bitcoin price on Google on that day: 22,777.54 GBP / BTC
* bitcoin transaction fees were about 2.7 BTC on that day
Sending 5 pounds to wallet `12dg2FaiZLp3VzDtLvwPinaKz41TQcEGbs`
* network fee: 0.00001989 BTC
* total bitcoin cost: -0.00023928 BTC
* new balance: 15,234 satoshi (39,162 - 23,928).
* total spent: £5.45
* time est.: about 30 minutes
This worked and I received 21939 satoshis (23928 - 1989) on <Electrum> on one of the outputs of transaction https://www.blockchain.com/explorer/transactions/btc/1177268091cbeaacbcaac5dc4f6d1774c4ec11b4bcffafa555cd2775eafb954c[1177268091cbeaacbcaac5dc4f6d1774c4ec11b4bcffafa555cd2775eafb954c].
Sending 1 satoshi back! The lowest fee in Electron is 1120 Satoshis targeting 25 blocks (4 hours). Let's do it. Failed, server forbids dust, minimum is 1000 satoshi. OK, sending 1000 satoshi, at 1139 fee.
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