Blockchain finance

APIs

• Blockcypher API service to query balances

BlockCypher runs the Main and Test Bitcoin, Litecoin and Dogecoin blockchains. The BlockCypher API is a simple, mostly RESTful JSON API, accessed over HTTP or HTTPS from the api.blockcypher.com domain BlockCypher APIs can be used up to these rate limits: Classic requests, up to 5 requests/sec and 600 requests/hr WebHooks and WebSockets, up to 600 requests/hr

After limit is reached you're blocked for ~1 hour.

Wallettool

• wallettool

A list of addresses / private keys is printed.

See ~/projects/finance/blockchain/walletool

Bitcoin

Segwit / Bech32 / P2SH

This transaction could save 36% on fees by upgrading to native SegWit-Bech32 or 26% by upgrading to SegWit-P2SH

Solution:

Just make a new wallet, and it should default to be native segwit and then send all your funds from the old wallet to the new wallet.

APIs / Monitoring services

Alerts

• cryptocurrencyalerting.com
• Fee alert

Charts

• BTC transaction fees
• Mempool congestion chart

Wallets

Electrum

• Website
• Docs
• Unofficial guides for Electrum
• Reddit
• Bitcointalk Electrum forum
• IRC: #electrum on Freenode