WebDollar Blockchain - Support Startup

### Project Setup
- [ ] Fork this repo.
- [ ] add your identifier in src/core/blockchain.ts
- [ ] copy src/blockchain/ethereum to src/blockchain/bitcoin and create your types
- [ ] add your class indexer into src/class.store.ts
- [ ] copy test/ethereum to test/bitcoin and update the tests

### For testing we can either use their testnet or create a new one.

Start by reading src/core/blockchain.ts, src/blockchain/ethereum, src/class.store.ts, and test/ethereum to understand the existing integration. The work is complete when the new blockchain directory, types, class indexer, identifier, and updated tests are in place, with a decision made about using the existing testnet or creating a new one.

Written by the indexing model from the issue text.