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CoverUS helps pay for your health insurance by using blockchain technology to securely broker your health data

CoverUS (pronounced “cover us”) is a blockchain-based, pre-launch healthcare startup that plans to reward its members with cryptocurrency in exchange for the right to broker their healthcare data. The startup won the Blockchain for Social Impact Hackathon in the Financial Inclusion category in November, and was featured in a FastCompany article earlier this month. Although no date is set for… […]

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How to generate a valid hash for a bip39 seed phrase?

I’m trying to prove to myself that I understand how bip39 seed phrases work… I’m doing most of this in a spreadsheet because I thought it would be easier but I’m having trouble with the checksum value… These are the steps I’m taking: I start with a valid 24 word seed then change each word […]

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Can I mix P2PKH and P2WPKH inputs in the same transaction?

I’m trying to increase my knowledge of bech32 and SegWit and to that end am working my way through this explanation. Here’s a hypothetical situation I’m trying to understand. Let’s say Jamal has access to a a couple of UXTOs. UXTO #1: 10 BTC (P2PKH) UXTO #2: 10 BTC (P2WPKH) Further, let’s say Jamal wants […]

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Error getting bitcoin block to process from DB

i am installing a full node on a linux server and i’m trying to connect to bitcoin with BIFROST(https://github.com/stellar/go/tree/master/services/bifrost) but i am getting the error below which looks like a bitcoin error. All blocks have been downloaded. Please someone should guide me. Thanks Error getting bitcoin block to process from DB: Error getting bitcoin_last_block from […]

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Permission problem installing bitcore

I have tried to install bitcore.io on a clean and upgraded Ubuntu 16.04.3 (64 bits) but always get permission errors. I have already created a user and password for bitcore: sudo useradd -r -m bitcore sudo usermod -aG sudo,adm bitcore sudo passwd bitcore Installed nodejs v8.9.3 and ZeroMQ: apt-get install libzmq3-dev build-essential But when install […]

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Basic bittrex api question

I read the api documentation but I could not find anythin related to market buy and sell commands. Where do I find this information? Moreover, I read the following from the api site https://bittrex.com/api/v1.1/market/selllimit?apikey=API_KEY&market=BTC-LTC&quantity=1.2&rate=1.3 My understand of this statement is that I use my 1.2 Bitcoin to buy 1.3X1.2 Litecoin. Is this correct? If I […]

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Remove Orphan blocks from "personal" blockchain

Alright, so I’ve been trying to learn a little more about the blockchain and blockchain-development lately. For every other altcoin, I’ve noticed that there’s such a thing as a bootstrap.dat-file which, as I understood it, essentially is a file containing the “correct” blockchain which simply get imported to the computer in order to speed up […]