A service discovery mechanism for counterparty communications over web APIs.

The TSC attempted to propose a standard formally, fixing some small aspect and stating that all capabilities were optional.

Most implementations in the wild still follow the original spec found here:

The SPV Wallet implements an extended Paymail capability set defined within the go-paymail package found here:

The specific capabilities used by the SPV-Wallet are detailed in thier respective BRC documents:

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