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Update README #163

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6 changes: 3 additions & 3 deletions docs/README.md
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# Trustchain

Trustchain is a decentralised approach to public key infrastructure, with applications in digital identities. In particular, it builds on the W3C standards for [decentralised identifiers (DID)](https://www.w3.org/TR/did-core/) and [verififiable credentials (VC)](https://www.w3.org/TR/did-core/).
Trustchain is a decentralised approach to public key infrastructure, which builds on the W3C standards for [decentralised identifiers (DID)](https://www.w3.org/TR/did-core/) and [verififiable credentials (VC)](https://www.w3.org/TR/did-core/).

These two standards are already closely linked: Verifying a VC involves performing the verification method specified in the DID document using verification material contained in the same DID document. For example, the verification material may be a public key, in which case the verification method is to use the key to verify a digital signature contained in the VC.
These two standards are closely linked: verifying a VC involves resolving the credential issuer's DID document and performing a verification method using material contained in that document. For example, the verification material may be a public key, in which case the verification method is to use the key to verify the issuer's digital signature on the credential.
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Trustchain enables the creation of DIDs which are themselves verifiable. Via this mechanism, chains of trustworthy DIDs can be constructed in which **downstream DIDs** (dDIDs) contain an attestation from an entity represented by an **upstream DID** (uDID).
Trustchain enables the creation of DIDs which are themselves verifiable. Via this mechanism, chains of trustworthy DIDs can be constructed in which **downstream DIDs** (dDIDs) contain an attestation from an entity represented by an **upstream DID** (uDID). It also enables a root DID to be securely established, so that downstream DIDs can be verified by tracing their chain of attestions back to the recognised root.

<center><img src="figs/dDID_schematic.png" width="400px" /></center>

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