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48 lines
1.8 KiB
Markdown
48 lines
1.8 KiB
Markdown
# registrar
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[](http://slack.blockstack.org/)
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For registering and updating [blockchain IDs](https://github.com/blockstack/blockstack/wiki/Blockchain-ID).
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Blockchain IDs are registered on the Bitcoin blockchain, using [Blockstore](https://github.com/blockstack/blockstore), and associated data is stored on external data stores like a DHT.
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A registrar is a service that registers blockchain IDs and then transfers them to the respective users, along with writing/updating any associated data. Just like GoDaddy helps you manage domain names, a blockchain ID registrar helps you register/manage your blockchain ID. However, the end-users have complete control over the blockchain IDs registered (after a transfer is complete), and anyone can decide to run a registrar.
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## Blockchain IDs
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Usernames may be up to 60 characters long and contain lowercase letters, numbers, and underscores.
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**Note:** usernames with ANY uppercase letters will be ignored by crawlers, so make sure to only use lowercase letters when you register a name.
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Regex: ^[a-z0-9_]{1,60}$
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## Registration
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To register a blockchain ID:
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1. choose an available username
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2. construct a valid JSON object that adheres to the [profile schema specifications](https://github.com/blockstack/blockstack/wiki/Blockchain-ID-Schema-v2)
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3. register the username and profile as an entry in the key-value store
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## HD Wallet
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Registrar comes with support a hierarchical deterministic wallet.
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```
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from registrar.wallet import HDWallet
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from registrar.wallet import display_wallet_info
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wallet = HDWallet()
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no_of_children = 5
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addresses = wallet.get_keypairs(no_of_children, include_privkey=False)
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display_wallet_info(addresses)
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```
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## License
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GPL v3. See LICENSE.
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Copyright: (c) 2015 by Blockstack.org
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