Decentralized Identity Systems Survey

	uPort	Sovrin	Blockstack	ERC-725
P2P Friendly	❌	✔️	✔️	⚠️ ^[1]
Verifiable Claims	⚠️ ^[2]	✔️	❌	⚠️ ^[3]
Aliasing	❌	✔️	✔️	❌
Delegate Keys	❌ ^[4]	✔️	❌	✔️
Key Rotation & Revocation	✔️ ^[5]	✔️	❌	✔️
Social-Key Recovery	?	✔️	❌	✔️
Costs	$	?	$$ ^[6]	$$$
Identity Wallet UI	✔️	❌	✔️	❌ ^[7]

^[1] There's no Identity Wallet applications that implement erc725 yet.
^[2] uPort claims & proofs is a simple key-value storage. Verifiable Claims can be stored within as values of that storage.
^[3] erc725 is studying the possibility to embrace Verifiable Claims but as of now, the data and uri of claims are agnostic.
^[4] uPort is working on a new DID method, called ethr, that will support delegates: https://github.com/uport-project/ethr-did-resolver.
^[5] Key rotation & revocation is possible via a (optional) Proxy Contract
^[6] The identity creation is free but one must (optionally) pay ~0.001096 bitcoins to have a username
^[7] OriginProtocol developed a "playground" to demonstrate the potential of the DID method, but it's not production ready nor enables users to authenticate to dApps: https://erc725.originprotocol.com

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