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class="truncate">DID</span></a></li><li class="relative"><a class="flex justify-between gap-2 py-1 pr-3 text-sm transition pl-4 text-zinc-600 hover:text-zinc-900 dark:text-zinc-400 dark:hover:text-white" href="/specs/handle"><span class="truncate">Handle</span></a></li><li class="relative"><a class="flex justify-between gap-2 py-1 pr-3 text-sm transition pl-4 text-zinc-600 hover:text-zinc-900 dark:text-zinc-400 dark:hover:text-white" href="/specs/nsid"><span class="truncate">NSID</span></a></li><li class="relative"><a aria-current="page" class="flex justify-between gap-2 py-1 pr-3 text-sm transition pl-4 text-zinc-900 dark:text-white" href="/specs/record-key"><span class="truncate">Record Key</span></a></li><li class="relative"><a class="flex justify-between gap-2 py-1 pr-3 text-sm transition pl-4 text-zinc-600 hover:text-zinc-900 dark:text-zinc-400 dark:hover:text-white" href="/specs/at-uri-scheme"><span class="truncate">URI Scheme</span></a></li></ul></div></li></ul></nav></div></header><div class="relative flex h-full flex-col px-4 pt-14 sm:px-6 lg:px-8"><main class="flex-auto"><article class="flex h-full flex-col pb-24 pt-16"><div class="flex-auto prose dark:prose-invert [html_:where(&>*)]:mx-auto [html_:where(&>*)]:max-w-2xl [html_:where(&>*)]:lg:mx-[calc(50%-min(50%,theme(maxWidth.lg)))] [html_:where(&>*)]:lg:max-w-3xl"><h1>Record Keys</h1> <p class="lead">A <strong>Record Key</strong> (sometimes shortened to <code>rkey</code>) is used to name and reference an individual record within the same collection of an atproto repository. It ends up as a segment in AT URIs, and in the repo MST path.</p> <p class="lead">A few different Record Key naming schemes are supported. Every record Lexicon schema will indicate which of the record key types should be used, depending on the needs and semantics of the record collection.</p> <h3>Record Key Type: <code>tid</code></h3> <p>This is the most common record naming scheme. <code>TID</code> is short for "timestamp identifier," and the name is derived from the creation time of the record.</p> <p>The characteristics of a TID are:</p> <ul> <li>64-bit integer</li> <li>big-endian byte ordering</li> <li>encoded as <code>base32-sortable</code>. That is, encoded with characters <code>234567abcdefghijklmnopqrstuvwxyz</code></li> <li>no special padding characters (like <code>=</code>) are used, but all digits are always encoded, so length is always 13 ASCII characters. The TID corresponding to integer zero is <code>2222222222222</code>.</li> <li>hyphens should not be included in a TID (unlike in previous iterations of the scheme)</li> </ul> <p>The layout of the 64-bit integer is:</p> <ul> <li>The top bit is always 0</li> <li>The next 53 bits represent microseconds since the UNIX epoch. 53 bits is chosen as the maximum safe integer precision in a 64-bit floating point number, as used by Javascript.</li> <li>The final 10 bits are a random "clock identifier."</li> </ul> <p>TID generators should generate a random clock identifier number, chosen to avoid collisions as much as possible (for example, between multiple worker instances of a PDS service cluster). A local clock can be used to generate the timestamp itself. Care should be taken to ensure the TID output stream is monotonically increasing and never repeats, even if multiple TIDs are generated in the same microsecond, or during "clock smear" or clock synchronization incidents. If the local clock has only millisecond precision, the timestamp should be padded. (You can do this by multiplying by 1000.)</p> <p>The primary motivation for the TID scheme is to provide a loose temporal ordering of records, which improves storage efficiency of the repository data structure (MST).</p> <p>Note: There are similarities to <a href="https://en.wikipedia.org/wiki/Snowflake_ID">"snowflake identifiers"</a>. In the decentralized context of atproto, the global uniqueness of TIDs can not be guaranteed, and an antagonistic repo controller could trivially create records re-using known TIDs.</p> <p>Syntactically valid TIDs:</p> <div class="my-6 overflow-hidden rounded-2xl bg-zinc-50 dark:bg-zinc-900 dark:ring-1 dark:ring-white/10"><div class="not-prose"><div class="group dark:bg-white/2.5"><div class="relative"><pre class="overflow-x-auto p-4 text-xs text-black dark:text-white"><code>3jzfcijpj2z2a 7777777777777 3zzzzzzzzzzzz 2222222222222 </code></pre><button type="button" class="group/button absolute right-4 top-3.5 overflow-hidden rounded-full py-1 pl-2 pr-3 text-2xs font-medium opacity-0 backdrop-blur transition focus:opacity-100 group-hover:opacity-100 bg-white/5 hover:bg-white/7.5 dark:bg-white/2.5 dark:hover:bg-white/5"><span aria-hidden="false" class="pointer-events-none flex items-center gap-0.5 text-zinc-400 transition duration-300"><svg viewBox="0 0 20 20" aria-hidden="true" class="h-5 w-5 fill-zinc-500/20 stroke-zinc-500 transition-colors group-hover/button:stroke-zinc-400"><path stroke-width="0" d="M5.5 13.5v-5a2 2 0 0 1 2-2l.447-.894A2 2 0 0 1 9.737 4.5h.527a2 2 0 0 1 1.789 1.106l.447.894a2 2 0 0 1 2 2v5a2 2 0 0 1-2 2h-5a2 2 0 0 1-2-2Z"></path><path fill="none" stroke-linejoin="round" d="M12.5 6.5a2 2 0 0 1 2 2v5a2 2 0 0 1-2 2h-5a2 2 0 0 1-2-2v-5a2 2 0 0 1 2-2m5 0-.447-.894a2 2 0 0 0-1.79-1.106h-.527a2 2 0 0 0-1.789 1.106L7.5 6.5m5 0-1 1h-3l-1-1"></path></svg>Copy</span><span aria-hidden="true" class="pointer-events-none absolute inset-0 flex items-center justify-center text-blue-400 transition duration-300 translate-y-1.5 opacity-0">Copied!</span></button></div></div></div></div> <p>Invalid TIDs:</p> <div class="my-6 overflow-hidden rounded-2xl bg-zinc-50 dark:bg-zinc-900 dark:ring-1 dark:ring-white/10"><div class="not-prose"><div class="group dark:bg-white/2.5"><div class="relative"><pre class="overflow-x-auto p-4 text-xs text-black dark:text-white"><code># not base32 3jzfcijpj2z21 0000000000000 # case-sensitive 3JZFCIJPJ2Z2A # too long/short 3jzfcijpj2z2aa 3jzfcijpj2z2 222 # legacy dash syntax *not* supported (TTTT-TTT-TTTT-CC) 3jzf-cij-pj2z-2a # high bit can't be set zzzzzzzzzzzzz kjzfcijpj2z2a </code></pre><button type="button" class="group/button absolute right-4 top-3.5 overflow-hidden rounded-full py-1 pl-2 pr-3 text-2xs font-medium opacity-0 backdrop-blur transition focus:opacity-100 group-hover:opacity-100 bg-white/5 hover:bg-white/7.5 dark:bg-white/2.5 dark:hover:bg-white/5"><span aria-hidden="false" class="pointer-events-none flex items-center gap-0.5 text-zinc-400 transition duration-300"><svg viewBox="0 0 20 20" aria-hidden="true" class="h-5 w-5 fill-zinc-500/20 stroke-zinc-500 transition-colors group-hover/button:stroke-zinc-400"><path stroke-width="0" d="M5.5 13.5v-5a2 2 0 0 1 2-2l.447-.894A2 2 0 0 1 9.737 4.5h.527a2 2 0 0 1 1.789 1.106l.447.894a2 2 0 0 1 2 2v5a2 2 0 0 1-2 2h-5a2 2 0 0 1-2-2Z"></path><path fill="none" stroke-linejoin="round" d="M12.5 6.5a2 2 0 0 1 2 2v5a2 2 0 0 1-2 2h-5a2 2 0 0 1-2-2v-5a2 2 0 0 1 2-2m5 0-.447-.894a2 2 0 0 0-1.79-1.106h-.527a2 2 0 0 0-1.789 1.106L7.5 6.5m5 0-1 1h-3l-1-1"></path></svg>Copy</span><span aria-hidden="true" class="pointer-events-none absolute inset-0 flex items-center justify-center text-blue-400 transition duration-300 translate-y-1.5 opacity-0">Copied!</span></button></div></div></div></div> <h3>Record Key Type: <code>literal:<value></code></h3> <p>This key type is used when there should be only a single record in the collection, with a fixed, well-known Record Key.</p> <p>The most common value is <code>self</code>, specified as <code>literal:self</code> in a Lexicon schema.</p> <h3>Record Key Type: <code>any</code></h3> <p>Any string meeting the overall Record Key schema requirements (see below) is allowed. This is the most flexible type of Record Key.</p> <p>This may be used to encode semantics in the name, for example, a domain name, integer, or (transformed) AT URI. This enables de-duplication and known-URI lookups.</p> <h3>Record Key Syntax</h3> <p>Regardless of the type, Record Keys must fulfill some baseline syntax constraints:</p> <ul> <li>restricted to a subset of ASCII characters — the allowed characters are alphanumeric (<code>A-Za-z0-9</code>), period, dash, underscore, colon, or tilde (<code>.-_:~</code>)</li> <li>must have at least 1 and at most 512 characters</li> <li>the specific record key values <code>.</code> and <code>..</code> are not allowed</li> <li>must be a permissible part of repository MST path string (the above constraints satisfy this condition)</li> <li>must be permissible to include in a path component of a URI (following RFC-3986, section 3.3). The above constraints satisfy this condition, by matching the "unreserved" characters allowed in generic URI paths.</li> </ul> <p>Record Keys are case-sensitive.</p> <h3>Examples</h3> <p>Valid Record Keys:</p> <div class="my-6 overflow-hidden rounded-2xl bg-zinc-50 dark:bg-zinc-900 dark:ring-1 dark:ring-white/10"><div class="not-prose"><div class="group dark:bg-white/2.5"><div class="relative"><pre class="overflow-x-auto p-4 text-xs text-black dark:text-white"><code>3jui7kd54zh2y self example.com ~1.2-3_ dHJ1ZQ pre:fix _ </code></pre><button type="button" class="group/button absolute right-4 top-3.5 overflow-hidden rounded-full py-1 pl-2 pr-3 text-2xs font-medium opacity-0 backdrop-blur transition focus:opacity-100 group-hover:opacity-100 bg-white/5 hover:bg-white/7.5 dark:bg-white/2.5 dark:hover:bg-white/5"><span aria-hidden="false" class="pointer-events-none flex items-center gap-0.5 text-zinc-400 transition duration-300"><svg viewBox="0 0 20 20" aria-hidden="true" class="h-5 w-5 fill-zinc-500/20 stroke-zinc-500 transition-colors group-hover/button:stroke-zinc-400"><path stroke-width="0" d="M5.5 13.5v-5a2 2 0 0 1 2-2l.447-.894A2 2 0 0 1 9.737 4.5h.527a2 2 0 0 1 1.789 1.106l.447.894a2 2 0 0 1 2 2v5a2 2 0 0 1-2 2h-5a2 2 0 0 1-2-2Z"></path><path fill="none" stroke-linejoin="round" d="M12.5 6.5a2 2 0 0 1 2 2v5a2 2 0 0 1-2 2h-5a2 2 0 0 1-2-2v-5a2 2 0 0 1 2-2m5 0-.447-.894a2 2 0 0 0-1.79-1.106h-.527a2 2 0 0 0-1.789 1.106L7.5 6.5m5 0-1 1h-3l-1-1"></path></svg>Copy</span><span aria-hidden="true" class="pointer-events-none absolute inset-0 flex items-center justify-center text-blue-400 transition duration-300 translate-y-1.5 opacity-0">Copied!</span></button></div></div></div></div> <p>Invalid Record Keys:</p> <div class="my-6 overflow-hidden rounded-2xl bg-zinc-50 dark:bg-zinc-900 dark:ring-1 dark:ring-white/10"><div class="not-prose"><div class="group dark:bg-white/2.5"><div class="relative"><pre class="overflow-x-auto p-4 text-xs text-black dark:text-white"><code>alpha/beta . .. #extra @handle any space any+space number[3] number(3) "quote" dHJ1ZQ== </code></pre><button type="button" class="group/button absolute right-4 top-3.5 overflow-hidden rounded-full py-1 pl-2 pr-3 text-2xs font-medium opacity-0 backdrop-blur transition focus:opacity-100 group-hover:opacity-100 bg-white/5 hover:bg-white/7.5 dark:bg-white/2.5 dark:hover:bg-white/5"><span aria-hidden="false" class="pointer-events-none flex items-center gap-0.5 text-zinc-400 transition duration-300"><svg viewBox="0 0 20 20" aria-hidden="true" class="h-5 w-5 fill-zinc-500/20 stroke-zinc-500 transition-colors group-hover/button:stroke-zinc-400"><path stroke-width="0" d="M5.5 13.5v-5a2 2 0 0 1 2-2l.447-.894A2 2 0 0 1 9.737 4.5h.527a2 2 0 0 1 1.789 1.106l.447.894a2 2 0 0 1 2 2v5a2 2 0 0 1-2 2h-5a2 2 0 0 1-2-2Z"></path><path fill="none" stroke-linejoin="round" d="M12.5 6.5a2 2 0 0 1 2 2v5a2 2 0 0 1-2 2h-5a2 2 0 0 1-2-2v-5a2 2 0 0 1 2-2m5 0-.447-.894a2 2 0 0 0-1.79-1.106h-.527a2 2 0 0 0-1.789 1.106L7.5 6.5m5 0-1 1h-3l-1-1"></path></svg>Copy</span><span aria-hidden="true" class="pointer-events-none absolute inset-0 flex items-center justify-center text-blue-400 transition duration-300 translate-y-1.5 opacity-0">Copied!</span></button></div></div></div></div> <h3>Usage and Implementation Guidelines</h3> <p>Implementations should not rely on global uniqueness of TIDs, and should not trust TID timestamps as actual record creation timestamps. Record Keys are "user-controlled data" and may be arbitrarily selected by hostile accounts.</p> <p>Most software processing repositories and records should be agnostic to the Record Key type and values, and usually treat them as simple strings. For example, relying on TID keys to decode as <code>base32</code> into a unique <code>uint64</code> makes it tempting to rely on this for use as a database key, but doing so is not resilient to key format changes and is discouraged.</p> <p>Note that in the context of a repository, the same Record Key value may be used under multiple collections. The tuple of <code>(did, rkey)</code> is not unique; the tuple <code>(did, collection, rkey)</code> is unique.</p> <p>As a best practice, keep key paths to under 80 characters in virtually all situations.</p> <p>The colon character was de-facto allowed in the reference implementation in 2023, and the spec was updated to allow this character in February 2024.</p> <p>Note that "most" DIDs work as record keys, but that the full DID W3C specification allows DIDs with additional characters. This means that DIDs could be used as record keys at time of writing, and this will work with current "blessed" DID methods (note that <code>did:web</code> is restricted in atproto to only full domains, not paths or port specification), but that this could break in the future with different DID methods or DID features (like <code>did:web</code> paths) allowed.</p> <p>While Record Keys are case-sensitive, it is a recommended practice to use all-lower-case Record Keys to avoid confusion and maximize possible re-use in case-insensitive contexts.</p> <h3>Possible Future Changes</h3> <p>The constraints on Record Key syntax may be relaxed in the future to allow non-ASCII Unicode characters. Record keys will always be valid Unicode, never relaxed to allow arbitrary byte-strings.</p> <p>Additional Record Key types may be defined.</p> <p>The maximum length may be tweaked.</p> <p>The <code>%</code> character is reserved for possible use with URL encoding, but note that such encoding is not currently supported.</p> <p>Additional constraints on the generic syntax may be added. For example, requiring at least one alphanumeric character.</p></div></article></main><footer class="mx-auto w-full max-w-2xl space-y-10 pb-16 lg:max-w-5xl"><div class="flex"><div class="flex flex-col items-start gap-3"><a class="inline-flex gap-0.5 justify-center overflow-hidden text-sm font-medium transition rounded-full bg-zinc-100 py-1 px-3 text-zinc-900 hover:bg-zinc-200 dark:bg-zinc-800/40 dark:text-zinc-400 dark:ring-1 dark:ring-inset dark:ring-zinc-800 dark:hover:bg-zinc-800 dark:hover:text-zinc-300" aria-label="Previous: NSID" href="/specs/nsid"><svg viewBox="0 0 20 20" fill="none" aria-hidden="true" class="mt-0.5 h-5 w-5 -ml-1 rotate-180"><path stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" d="m11.5 6.5 3 3.5m0 0-3 3.5m3-3.5h-9"></path></svg>Previous</a><a tabindex="-1" aria-hidden="true" class="text-base font-semibold text-zinc-900 transition hover:text-zinc-600 dark:text-white dark:hover:text-zinc-300" href="/specs/nsid">NSID</a></div><div class="ml-auto flex flex-col items-end gap-3"><a class="inline-flex gap-0.5 justify-center overflow-hidden text-sm font-medium transition rounded-full bg-zinc-100 py-1 px-3 text-zinc-900 hover:bg-zinc-200 dark:bg-zinc-800/40 dark:text-zinc-400 dark:ring-1 dark:ring-inset dark:ring-zinc-800 dark:hover:bg-zinc-800 dark:hover:text-zinc-300" aria-label="Next: URI Scheme" href="/specs/at-uri-scheme">Next<svg viewBox="0 0 20 20" fill="none" aria-hidden="true" class="mt-0.5 h-5 w-5 -mr-1"><path stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" d="m11.5 6.5 3 3.5m0 0-3 3.5m3-3.5h-9"></path></svg></a><a tabindex="-1" aria-hidden="true" class="text-base font-semibold text-zinc-900 transition hover:text-zinc-600 dark:text-white dark:hover:text-zinc-300" href="/specs/at-uri-scheme">URI Scheme</a></div></div><div class="flex flex-col items-center justify-between gap-5 border-t border-zinc-900/5 pt-8 sm:flex-row dark:border-white/5"><p class="text-xs text-zinc-600 dark:text-zinc-400">© Copyright 2024. 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It ends up as a segment in AT URIs, and in the repo MST path.\"],\"className\":\"lead\"}],\"\\n\",[\"$\",\"p\",null,{\"children\":\"A few different Record Key naming schemes are supported. Every record Lexicon schema will indicate which of the record key types should be used, depending on the needs and semantics of the record collection.\",\"className\":\"lead\"}],\"\\n\",[\"$\",\"h3\",null,{\"children\":[\"Record Key Type: \",[\"$\",\"$L4\",null,{\"children\":\"tid\"}]]}],\"\\n\",[\"$\",\"p\",null,{\"children\":[\"This is the most common record naming scheme. \",[\"$\",\"$L4\",null,{\"children\":\"TID\"}],\" is short for \\\"timestamp identifier,\\\" and the name is derived from the creation time of the record.\"]}],\"\\n\",[\"$\",\"p\",null,{\"children\":\"The characteristics of a TID are:\"}],\"\\n\",[\"$\",\"ul\",null,{\"children\":[\"\\n\",[\"$\",\"li\",null,{\"children\":\"64-bit integer\"}],\"\\n\",[\"$\",\"li\",null,{\"children\":\"big-endian byte ordering\"}],\"\\n\",[\"$\",\"li\",null,{\"children\":[\"encoded as \",[\"$\",\"$L4\",null,{\"children\":\"base32-sortable\"}],\". That is, encoded with characters \",[\"$\",\"$L4\",null,{\"children\":\"234567abcdefghijklmnopqrstuvwxyz\"}]]}],\"\\n\",[\"$\",\"li\",null,{\"children\":[\"no special padding characters (like \",[\"$\",\"$L4\",null,{\"children\":\"=\"}],\") are used, but all digits are always encoded, so length is always 13 ASCII characters. The TID corresponding to integer zero is \",[\"$\",\"$L4\",null,{\"children\":\"2222222222222\"}],\".\"]}],\"\\n\",[\"$\",\"li\",null,{\"children\":\"hyphens should not be included in a TID (unlike in previous iterations of the scheme)\"}],\"\\n\"]}],\"\\n\",[\"$\",\"p\",null,{\"children\":\"The layout of the 64-bit integer is:\"}],\"\\n\",[\"$\",\"ul\",null,{\"children\":[\"\\n\",[\"$\",\"li\",null,{\"children\":\"The top bit is always 0\"}],\"\\n\",[\"$\",\"li\",null,{\"children\":\"The next 53 bits represent microseconds since the UNIX epoch. 53 bits is chosen as the maximum safe integer precision in a 64-bit floating point number, as used by Javascript.\"}],\"\\n\",[\"$\",\"li\",null,{\"children\":\"The final 10 bits are a random \\\"clock identifier.\\\"\"}],\"\\n\"]}],\"\\n\",[\"$\",\"p\",null,{\"children\":\"TID generators should generate a random clock identifier number, chosen to avoid collisions as much as possible (for example, between multiple worker instances of a PDS service cluster). A local clock can be used to generate the timestamp itself. Care should be taken to ensure the TID output stream is monotonically increasing and never repeats, even if multiple TIDs are generated in the same microsecond, or during \\\"clock smear\\\" or clock synchronization incidents. If the local clock has only millisecond precision, the timestamp should be padded. (You can do this by multiplying by 1000.)\"}],\"\\n\",[\"$\",\"p\",null,{\"children\":\"The primary motivation for the TID scheme is to provide a loose temporal ordering of records, which improves storage efficiency of the repository data structure (MST).\"}],\"\\n\",[\"$\",\"p\",null,{\"children\":[\"Note: There are similarities to \",[\"$\",\"$L5\",null,{\"href\":\"https://en.wikipedia.org/wiki/Snowflake_ID\",\"children\":\"\\\"snowflake identifiers\\\"\"}],\". In the decentralized context of atproto, the global uniqueness of TIDs can not be guaranteed, and an antagonistic repo controller could trivially create records re-using known TIDs.\"]}],\"\\n\",[\"$\",\"p\",null,{\"children\":\"Syntactically valid TIDs:\"}],\"\\n\",[\"$\",\"$L6\",null,{\"code\":\"3jzfcijpj2z2a\\n7777777777777\\n3zzzzzzzzzzzz\\n2222222222222\\n\",\"children\":[\"$\",\"$L4\",null,{\"children\":\"3jzfcijpj2z2a\\n7777777777777\\n3zzzzzzzzzzzz\\n2222222222222\\n\"}]}],\"\\n\",[\"$\",\"p\",null,{\"children\":\"Invalid TIDs:\"}],\"\\n\",[\"$\",\"$L6\",null,{\"code\":\"# not base32\\n3jzfcijpj2z21\\n0000000000000\\n\\n# case-sensitive\\n3JZFCIJPJ2Z2A\\n\\n# too long/short\\n3jzfcijpj2z2aa\\n3jzfcijpj2z2\\n222\\n\\n# legacy dash syntax *not* supported (TTTT-TTT-TTTT-CC)\\n3jzf-cij-pj2z-2a\\n\\n# high bit can't be set\\nzzzzzzzzzzzzz\\nkjzfcijpj2z2a\\n\",\"children\":[\"$\",\"$L4\",null,{\"children\":\"# not base32\\n3jzfcijpj2z21\\n0000000000000\\n\\n# case-sensitive\\n3JZFCIJPJ2Z2A\\n\\n# too long/short\\n3jzfcijpj2z2aa\\n3jzfcijpj2z2\\n222\\n\\n# legacy dash syntax *not* supported (TTTT-TTT-TTTT-CC)\\n3jzf-cij-pj2z-2a\\n\\n# high bit can't be set\\nzzzzzzzzzzzzz\\nkjzfcijpj2z2a\\n\"}]}],\"\\n\",[\"$\",\"h3\",null,{\"children\":[\"Record Key Type: \",[\"$\",\"$L4\",null,{\"children\":\"literal:\u003cvalue\u003e\"}]]}],\"\\n\",[\"$\",\"p\",null,{\"children\":\"This key type is used when there should be only a single record in the collection, with a fixed, well-known Record Key.\"}],\"\\n\",[\"$\",\"p\",null,{\"children\":[\"The most common value is \",[\"$\",\"$L4\",null,{\"children\":\"self\"}],\", specified as \",[\"$\",\"$L4\",null,{\"children\":\"literal:self\"}],\" in a Lexicon schema.\"]}],\"\\n\",[\"$\",\"h3\",null,{\"children\":[\"Record Key Type: \",[\"$\",\"$L4\",null,{\"children\":\"any\"}]]}],\"\\n\",[\"$\",\"p\",null,{\"children\":\"Any string meeting the overall Record Key schema requirements (see below) is allowed. This is the most flexible type of Record Key.\"}],\"\\n\",[\"$\",\"p\",null,{\"children\":\"This may be used to encode semantics in the name, for example, a domain name, integer, or (transformed) AT URI. This enables de-duplication and known-URI lookups.\"}],\"\\n\",[\"$\",\"h3\",null,{\"children\":\"Record Key Syntax\"}],\"\\n\",[\"$\",\"p\",null,{\"children\":\"Regardless of the type, Record Keys must fulfill some baseline syntax constraints:\"}],\"\\n\",[\"$\",\"ul\",null,{\"children\":[\"\\n\",[\"$\",\"li\",null,{\"children\":[\"restricted to a subset of ASCII characters — the allowed characters are alphanumeric (\",[\"$\",\"$L4\",null,{\"children\":\"A-Za-z0-9\"}],\"), period, dash, underscore, colon, or tilde (\",[\"$\",\"$L4\",null,{\"children\":\".-_:~\"}],\")\"]}],\"\\n\",[\"$\",\"li\",null,{\"children\":\"must have at least 1 and at most 512 characters\"}],\"\\n\",[\"$\",\"li\",null,{\"children\":[\"the specific record key values \",[\"$\",\"$L4\",null,{\"children\":\".\"}],\" and \",[\"$\",\"$L4\",null,{\"children\":\"..\"}],\" are not allowed\"]}],\"\\n\",[\"$\",\"li\",null,{\"children\":\"must be a permissible part of repository MST path string (the above constraints satisfy this condition)\"}],\"\\n\",[\"$\",\"li\",null,{\"children\":\"must be permissible to include in a path component of a URI (following RFC-3986, section 3.3). The above constraints satisfy this condition, by matching the \\\"unreserved\\\" characters allowed in generic URI paths.\"}],\"\\n\"]}],\"\\n\",[\"$\",\"p\",null,{\"children\":\"Record Keys are case-sensitive.\"}],\"\\n\",[\"$\",\"h3\",null,{\"children\":\"Examples\"}],\"\\n\",[\"$\",\"p\",null,{\"children\":\"Valid Record Keys:\"}],\"\\n\",[\"$\",\"$L6\",null,{\"code\":\"3jui7kd54zh2y\\nself\\nexample.com\\n~1.2-3_\\ndHJ1ZQ\\npre:fix\\n_\\n\",\"children\":[\"$\",\"$L4\",null,{\"children\":\"3jui7kd54zh2y\\nself\\nexample.com\\n~1.2-3_\\ndHJ1ZQ\\npre:fix\\n_\\n\"}]}],\"\\n\",[\"$\",\"p\",null,{\"children\":\"Invalid Record Keys:\"}],\"\\n\",[\"$\",\"$L6\",null,{\"code\":\"alpha/beta\\n.\\n..\\n#extra\\n@handle\\nany space\\nany+space\\nnumber[3]\\nnumber(3)\\n\\\"quote\\\"\\ndHJ1ZQ==\\n\",\"children\":[\"$\",\"$L4\",null,{\"children\":\"alpha/beta\\n.\\n..\\n#extra\\n@handle\\nany space\\nany+space\\nnumber[3]\\nnumber(3)\\n\\\"quote\\\"\\ndHJ1ZQ==\\n\"}]}],\"\\n\",[\"$\",\"h3\",null,{\"children\":\"Usage and Implementation Guidelines\"}],\"\\n\",[\"$\",\"p\",null,{\"children\":\"Implementations should not rely on global uniqueness of TIDs, and should not trust TID timestamps as actual record creation timestamps. Record Keys are \\\"user-controlled data\\\" and may be arbitrarily selected by hostile accounts.\"}],\"\\n\",[\"$\",\"p\",null,{\"children\":[\"Most software processing repositories and records should be agnostic to the Record Key type and values, and usually treat them as simple strings. For example, relying on TID keys to decode as \",[\"$\",\"$L4\",null,{\"children\":\"base32\"}],\" into a unique \",[\"$\",\"$L4\",null,{\"children\":\"uint64\"}],\" makes it tempting to rely on this for use as a database key, but doing so is not resilient to key format changes and is discouraged.\"]}],\"\\n\",[\"$\",\"p\",null,{\"children\":[\"Note that in the context of a repository, the same Record Key value may be used under multiple collections. The tuple of \",[\"$\",\"$L4\",null,{\"children\":\"(did, rkey)\"}],\" is not unique; the tuple \",[\"$\",\"$L4\",null,{\"children\":\"(did, collection, rkey)\"}],\" is unique.\"]}],\"\\n\",[\"$\",\"p\",null,{\"children\":\"As a best practice, keep key paths to under 80 characters in virtually all situations.\"}],\"\\n\",[\"$\",\"p\",null,{\"children\":\"The colon character was de-facto allowed in the reference implementation in 2023, and the spec was updated to allow this character in February 2024.\"}],\"\\n\",[\"$\",\"p\",null,{\"children\":[\"Note that \\\"most\\\" DIDs work as record keys, but that the full DID W3C specification allows DIDs with additional characters. 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