Abstract definition: A Hash Time Locked Contract ( HTLC ) is a type of script that a sender can lock funds in with two payment routes. …


Fold provides a few different payment methods that offer up to 20 percent back in bitcoin on your purchase. Below are the payment methods offered along with the platform supported.

  • Credit Card (Mobile)
  • Bitcoin (Web)
  • Lightning (Mobile and Web)

What is Lightning

Lightning is short for The Lightning Network, which is a quicker…


Credit: buybitcoinworldwide

Warning: This article is not for beginners. It will explore HD wallets, how they’re built, and how to use them in Bitcoin.

This article will be relevant across Bitcoin, Bitcoin Cash, and all other forks of Bitcoin that still hold “Bitcoin” in the name.

What exactly is an HD wallet?

If you find yourself asking this…


Got an interview coming up for a crypto interview? Here’s a short list of facts and explanations I’ve come up with while preparing for my series of interviews.

This article is a constant work in progress, and additions will be made as time progresses or as proposed.

Bitcoin Transactions

  1. Can be comprised…


Credit: Prooworld

Warning: This article is not for beginners. It will explore HD wallets, how they’re built, and how to use them in Ethereum.

What exactly is an HD wallet?

Hierarchical Deterministic Wallets (or HD wallets for short) were introduced by BIP 32 and later improved by BIP 44. BIPs (if you’re not familiar with them) stand for…


This article is not intended for beginners in the crypto space. It is an in-depth analysis on the structure and usage of an HD Wallet for developers.

Hierarchical Deterministic Wallets (or HD wallets for short) were introduced by BIP 32 and later improved by BIP 44. BIPs (if you’re not…


Credit: yeeply.com

For the last year it’s been Blockchain, Blockchain, Blockchain! It’s a word we all started hearing around the end of 2017 when Bitcoin began it’s steep climb to it’s all time high of $20,089 per token. But does it also revolutionize the supply chain industry? There are plenty of companies…

Harsha Goli

Former fold, bitpay Engineer

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