Module chunk 

Chunk header per SPEC v0.30 §2.2.

Encodes the 37-bit chunked wire-format header. First-symbol layout MSB-first: [v3][v2][v1][v0][chunked] (4-bit version + 1-bit chunked-flag). Remainder: 20-bit chunk-set-id + 6-bit count-minus-1 + 6-bit index. Total = 4 + 1 + 20 + 6 + 6 = 37 bits.

Structs

ChunkHeader

Wire header for a single chunk in a chunked v0.30 payload.

Constants

SINGLE_STRING_PAYLOAD_BIT_LIMIT

Threshold (in payload bits) above which chunking is required. Derived from codex32 regular-form’s 80-char data-part limit (per BIP 93): 3 HRP + 1 separator + 64 data + 13 checksum (see codex32::REGULAR_CHECKSUM_SYMBOLS). Long-form codex32 was dropped in v0.12.0, so the legal data-symbol budget per chunk is 64 = 320 bits. Encoders attempt single-string emit first; if the codex32 wrapping reports “too long”, split into N chunks.

Functions

derive_chunk_set_id

Derive the 20-bit chunk-set-id from a Md1EncodingId by taking the top 20 bits of the underlying 16-byte hash, MSB-first.

reassemble

Reassemble a Descriptor from N md1 codex32 strings.

split

Split a Descriptor into N codex32 md1 strings, each carrying a chunk header and a slice of the canonical payload.