They mention 4 approaches: 1. Oracles and Notaries 2. Sidechains/Relays 3. Time-bound Asset Locking and Release 4. Application Layer Adaptors
Mentioned in the approaches: 1. Oracles & Notaries ( $LINK ) 2. Sidechains/Relays/Value Transfer ( $DOT and #interledger) 3. Time-bound Asset Locking and Release (HTLC) 4. Application Layer Adaptors/API Approach (DAML smart-contracts & $QNT @Overledger any-to-any blockchain app)
The World Bank tested 3 of the 4 approaches:
2⃣- Interledger
3⃣ - HTLC
4⃣ - API approach for a *non-smart contract* Procure-to-Pay resource
It sounds like they used @quant_network@Overledger in test number 4, as a non-smart contract-specific data service was created.
"Among various explorations by the World Bank teams, the e-Procurement and disbursement traceability use case exploration is very relevant in the interoperability discussion."
The e-Procurement use case was test #4.
It sounds to me like the World Bank loves @Overledger
Operating System choice is a Chicken and Egg problem.
Currently, in the #crypto world, we have many different #blockchains and #DLT platforms. Most dApps can only interact with the platform network they are built on, or 1-2 others.