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Is Blockchain an open source technology or is it owned by a company?

I didn't see it spelled out but Blockchain.com website appears to belong to a company.

There also seems to be different implementations of blockchain databases/ledgers.

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Blockchain is some concept. There are different implementations of blockchain. Most of them open source. The most notable one is the cryptocurrency Bitcoin with their reference implementation -Bitcoin Core.

Blockchain.com is just the company with the website which provides some services related to the bitcoin cryptocurrency and owns very attractive web address.

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Its called blockCHAIN for a reason, There are many makers of this masterpiece this son. I hope it works for you, Best of luck mate.

  • it's CHAIN because it includes blocks which are connected with each other (with hashing). – Alpha Dec 26 '17 at 14:07

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