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mempool
Explore the full Bitcoin ecosystem with mempool.space, or self-host your own instance with one-click installation on popular Raspberry Pi fullnode distros including Umbrel, Raspiblitz, Start9, and more!
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Don't know how much Coinbase charges for a transfer, but onchain pricing can be seen here: https://mempool.space/
Install BlueWallet (https://bluewallet.io) on your iPhone or Android and send yourself $50 worth of Bitcoin to it. You'll learn how a wallet functions. Cold storage does exactly the same, except that it physically separates the private key management from the fund management.