Michael Schapira

**Describe the bug** Initial block indexing crash ``` [2024-04-05T05:17:12.533Z INFO electrs::index] indexing 2000 blocks: [617051..619050] thread 'main' panicked at 'core returned invalid block: Needed(4294967295)', src/index.rs:294:49 stack backtrace: 0: rust_begin_unwind at...