$ wc -c arxiv-pdf-r2id/1z/r2id1zzz.txt
10269 arxiv-pdf-r2id/1z/r2id1zzz.txt

$ grep -c "rip-item" arxiv-pdf-r2id/1z/r2id1zzz.txt
26

$ wc -c --total=only arxiv-pdf-r2id/1z/*
11811808

$ du -sh arxiv-pdf-r2id/
448M    arxiv-pdf-r2id/

$ tail -n 4 arxiv-pdf-r2id/1z/r2id1zzz.txt
rip-item plain r2id1zzzzyup6vqyotnmwzxzmnhwr4lxrhgfdfohp453xrll4vdaq5ok21rqwjgc ++
  [kv-2] 0 {"sha256":"r2h21pj7gfkt2q4zcrddrz2zchev3mu2an5g43ezp4svbu2soaommzrxk17mst7w","size":550616}
  1 {"md5":"r2h51dl2fmycoltsy2gsnynketrcja21b32ld2","sha1":"r2h01knzonvrw7pquvji7jwsl5ehv52aizscy1covh3r"}
  2 {"name":"pdf/arXiv_pdf_2003_004.tar:2003/2003.00899.pdf"} --

$ b3sum --raw <(curl -s "https://arxiv.org/pdf/2003.00899") | base32 | tr A-Z2-7 2-7a-z
zzzzyup6vqyotnmwzxzmnhwr4lxrhgfdfohp453xrll4vdaq5ok2====

---

record
	type		rip-item
	variant		plain
	material	r2id1zzzzyup6vqyotnmwzxzmnhwr4lxrhgfdfohp453xrll4vdaq5ok21rqwjgc
	(blake3)

members
	0-sha256	r2h21pj7gfkt2q4zcrddrz2zchev3mu2an5g43ezp4svbu2soaommzrxk17mst7w
	0-size		550616
	1-md5		r2h51dl2fmycoltsy2gsnynketrcja21b32ld2
	1-sha1		r2h01knzonvrw7pquvji7jwsl5ehv52aizscy1covh3r
	2-name		pdf/arXiv_pdf_2003_004.tar:2003/2003.00899.pdf

r2values
	prefix		r2<value-magic>		r2id
	sep		1			1
	body		<base32-sortable>*	zzzzyup6vqyotnmwzxzmnhwr4lxrhgfdfohp453xrll4vdaq5ok2
	sep		1			1
	checksum	<bech32m-no-hrp>	rqwjgc

*an ATProto base32 alphabet: 234567abcdefghijklmnopqrstuvwxyz