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The Cacti repository lies in https://github.com/hyperledger/cacti. The present implementation of the relay lies in https://github.com/hyperledger/cacti/tree/main/weaver/core/relay, with specifications in https://github.com/hyperledger/cacti/blob/main/weaver/rfcs/models/infrastructure/relays.md and https://github.com/hyperledger/cacti/blob/main/weaver/rfcs/protocols/data-sharing/generic.md, and setup/testing instructions in https://labs.hyperledger.org/weaver-dlt-interoperability/docs/external/getting-started/guide (this will be ported to Cacti docs in the future).
The present IETF SATF SATP draft specifications can be found in https://datatracker.ietf.org/wg/satp/about/. Links to drafts are as follows:
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