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About the application:

Concord is a Blockstack apk that lets you make safe digitally signed micro agreements with a counter party. To use Concord, you will be prompted to make a Blockstack ID if you do not already have one. Once you are signed in using Blockstack, you can add another Blockstack players as contacts using their Blockstack name. Agreements can be made only with Blockstack players who have already installed the apk and have been added as contacts.Your agreements and contacts are backed up to Blockstack's Gaia storage, and content is encrypted so that only the apk player can ever read it. Cryptographic keys used by Blockstack to sign and encrypt your agreements never leave your device. This ensured that only you truly own your data.