OrderlyID is a typed, time-sortable, globally unique identifier format with optional checksums and built-in fields for tenancy and sharding. It is designed for distributed systems, developer ergonomics, and safer use in public APIs.

Status: Draft v0.1 — stable enough for experimentation. Spec + reference implementation in Go. Feedback and contributions welcome.

OrderlyID = <type>_<payload>[-<checksum>]

• Typed: human-readable type prefix (order_..., user_...)
• K-sortable: lexicographic order ≈ creation time (UUIDv7-style)
• Globally unique: safe to mint in any service/region
• DX-friendly: great in logs, APIs, and distributed systems
• Optional extras: checksum to catch copy/paste errors; fields for tenant/shard/sequence

If you currently use AUTO_INCREMENT or UUIDv4, OrderlyID improves safety, scale, and developer ergonomics with minimal fuss.

vs AUTO_INCREMENT

• Needs DB round-trips / central sequences
• Predictable & leaks volume (bad for public APIs)
• Harder to shard or generate offline

vs UUIDv4

• Not time-sortable (needs extra timestamp/index)
• No type context in logs
• Chunky hex; weaker DX

OrderlyID

• App-side generation, K-sortable, self-describing (order_...)
• Works across services/regions/edge; fits SQL & NoSQL (DynamoDB) alike
• Optional checksum for fat-finger protection

• Greppable logs: shipment_... vs random hex → faster triage
• Cursor pagination: WHERE id < :cursor ORDER BY id DESC LIMIT N
• Idempotency keys: stable across HTTP, queues, DB writes
• Cross-service correlation: put the same typed ID in headers/metrics
• Offline generation: mint IDs on mobile/edge; sync later
• Multi-tenant routing (optional field): cheap partitioning/archival
• Global feeds: shard by hash(id) and merge per-shard tails
• Fixtures & tests: readable seed data (user_*, order_*)
• Operational safety: checksum catches copy/paste/transcription errors

UUIDv4: 550e8400-e29b-41d4-a716-446655440000
OrderlyID: order_00myngy59c0003000dfk59mg3e36j3rr-9xgg

<prefix>_<payload>[-<checksum>]

• prefix: [a-z][a-z0-9]{1,30} (entity type; lowercase)
• _: required separator
• payload: Base32 (Crockford) of a 160-bit body (exactly 32 chars)
• checksum: optional 4 chars (Bech32-style polymod over <prefix>_<payload>)

Example:
order_00myngy59c0003000dfk59mg3e36j3rr-9xgg
 | |
 +-- prefix ("order") +-- checksum (optional)
 |--- payload (32 Base32 chars; encodes 160-bit body)

| 48b time | 8b flags | 16b tenant | 12b seq | 16b shard | 60b random |

• time (48b): Unix ms since 2020年01月01日 UTC (epoch shift trims bits)
• flags (8b): version + privacy marker
• tenant (16b): org/region id (0 if unused)
• seq (12b): per-node monotonic counter for same-ms bursts
• shard (16b): storage/routing hint
• random (60b): CSPRNG entropy

Properties

• Lexicographic order ≈ time → flags → tenant → seq → shard → random
• Canonical output is lowercase; parsers MAY accept uppercase
• URL/file safe; stable length; checksum optional

import "github.com/orderlykit/orderlyid"
id := orderlyid.New("order",
 orderlyid.WithTenant(12),
 orderlyid.WithShardFromBytes([]byte("customer")),
 orderlyid.WithChecksum(true),
)
// => "order_00myngy59c0003000dfk59mg3e36j3rr-9xgg"

$ go run ./cmd/orderlyid -prefix order -tenant 12 -n 1
order_00mzmwep4w00030000006tcw2f0g2a5n 2025年09月17日T18:03:43.527Z tenant=12 shard=0 seq=0
$ go run ./cmd/orderlyid -parse order_00mzmwep4w00030000006tcw2f0g2a5n
ID: order_00mzmwep4w00030000006tcw2f0g2a5n
prefix: order
time (ms): 1758132223527
time (iso): 2025年09月17日T18:03:43.527Z
flags: 0x00
tenant: 12
seq: 0
shard: 0
random60: 0x03699c13c10128b5

DynamoDB timeline PK = ITEM#{itemId}, SK = EVT#{orderlyid} → Query gives "latest first"

Global lookup by public ID GSI: GSI1PK = PUBLICID#{orderlyid}, GSI1SK = CONST

Postgres / MySQL

• Store both id_text VARCHAR(64) UNIQUE and id_bin BINARY(20)
• Index id_bin for range scans
• Use id_text for APIs/logs

• Dual-write a public_id column (keep your existing PK)
• Accept both old and new IDs at read edges
• Prefer new IDs in logs/metrics immediately
• Backfill in batches; flip API docs once ready

• spec/0001-spec.md — normative spec
• spec/test-vectors.json — conformance vectors
• spec/README.md — overview and guidance

OrderlyID builds on a long line of identifier formats and open-source work:

• UUID (RFC 4122) — the original 128-bit unique identifier
• ULID — introduced time-sortable IDs with a Base32 encoding
• UUIDv7 (IETF draft) — formalizes a time-ordered variant
• TypeID — combined typed prefixes with UUIDv7-style bodies

OrderlyID is inspired by TypeID but is not a fork. It shares the motivation of human-friendly, typed identifiers while extending the design with:

• A 160-bit body (vs 128-bit) with tenant/shard/seq fields
• Optional 4-char checksum for safer use in public/admin surfaces
• A privacy flag for time bucketing in user-facing contexts

We thank the authors of UUID, ULID, UUIDv7, and TypeID for the foundational ideas.

• Reference implementation: Go (production-ready, conformance-tested).
• Planned bindings: Rust and Python (contributors welcome).
• Once the spec stabilizes, we aim to add official libraries for more languages and databases.

• See spec/0001-spec.md and spec/test-vectors.json
• All implementations must pass the conformance tool before merge. We welcome feedback on the spec, new language bindings, and real-world use cases.

Apache License 2.0 © 2025 Piljoong Kim