What are the current standards efforts for blockchain data interchange?<p>W3C JSON-LD, ld-signatures + lds-merkleproof2017 (normalize the data before signing it so that the signature is representation-independent (JSONLD, RDFa, RDF, n-triples)), W3C DID Decentralized Identifiers, W3C Verifiable Claims, Blockcerts.org<p>W3C Credentials Community Group: <a href="https://w3c-ccg.github.io/community/work_items.html#draft-specifications-and-reports" rel="nofollow">https://w3c-ccg.github.io/community/work_items.html#draft-sp...</a> (DID, Multihash (IETF), [...])<p>"Blockchain Credential Resources; a gist" <a href="https://gist.github.com/westurner/4345987bb29fca700f52163c339a270f" rel="nofollow">https://gist.github.com/westurner/4345987bb29fca700f52163c33...</a><p>Specifically for payments:<p><a href="https://www.w3.org/TR/?title=payment" rel="nofollow">https://www.w3.org/TR/?title=payment</a> (the W3C Payment Request API standardizes browser UI payment/checkout workflows)<p>ILP: Interledger Protocol
<a href="https://interledger.org/rfcs/0027-interledger-protocol-4/" rel="nofollow">https://interledger.org/rfcs/0027-interledger-protocol-4/</a>