BIP‑353: Clarify TXT record structure and concatenation order (single RR; RDATA order; no cross‑RR joins) #2000
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BIP-353: Clarify TXT record structure and concatenation order (single RR; RDATA order; no cross-RR joins)
removed: “If more than one TXT RR beginning with bitcoin: … treat as invalid.” -- redundant.
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cc: @TheBlueMatt |
murchandamus
added
Proposed BIP modification
Pending acceptance
TheBlueMatt
reviewed
Oct 9, 2025
bip-0353.mediawiki
Outdated
| Payment instructions are indexed by both a user and a domain. Instructions for a given <code>user</code> and <code>domain</code> are stored at <code>user</code>.user._bitcoin-payment.<code>domain</code> in a single TXT record. | ||
| Payment instructions are indexed by both a user and a domain. Instructions for a given <code>user</code> and <code>domain</code> are stored at <code>user</code>.user._bitcoin-payment.<code>domain</code> in a single TXT RR. | ||
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| The TXT RR’s RDATA <b>MUST</b> consist of one or more DNS <code><character-string></code>s (see [[https://www.rfc-editor.org/rfc/rfc1035#section-3.3.14|RFC 1035 §3.3.14]]), each ≤255 bytes. |
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I mean sure, but this is also the definition of a TXT RR :)
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Might be nice for readers not to need to look it up separately.
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I’m not sure what you were exactly going for, but if you wanted to render that as <character-string>, the < and > is done twice to the point it has an unintended outcome:
This is what the rendered file looks like:
I think one of the following would have the intended outcome:
Suggested change
| The TXT RR’s RDATA <b>MUST</b> consist of one or more DNS <code><character-string></code>s (see [[https://www.rfc-editor.org/rfc/rfc1035#section-3.3.14|RFC 1035 §3.3.14]]), each ≤255 bytes. | |
| The TXT RR’s RDATA <b>MUST</b> consist of one or more DNS <code><character-string></code>s (see [[https://www.rfc-editor.org/rfc/rfc1035#section-3.3.14|RFC 1035 §3.3.14]]), each ≤255 bytes. |
Suggested change
| The TXT RR’s RDATA <b>MUST</b> consist of one or more DNS <code><character-string></code>s (see [[https://www.rfc-editor.org/rfc/rfc1035#section-3.3.14|RFC 1035 §3.3.14]]), each ≤255 bytes. | |
| The TXT RR’s RDATA <b>MUST</b> consist of one or more DNS <character-string>s (see [[https://www.rfc-editor.org/rfc/rfc1035#section-3.3.14|RFC 1035 §3.3.14]]), each ≤255 bytes. |
murchandamus
removed
the
Pending acceptance
murchandamus
reviewed
Oct 9, 2025
bip-0353.mediawiki
Outdated
| Payment instructions are indexed by both a user and a domain. Instructions for a given <code>user</code> and <code>domain</code> are stored at <code>user</code>.user._bitcoin-payment.<code>domain</code> in a single TXT record. | ||
| Payment instructions are indexed by both a user and a domain. Instructions for a given <code>user</code> and <code>domain</code> are stored at <code>user</code>.user._bitcoin-payment.<code>domain</code> in a single TXT RR. | ||
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| The TXT RR’s RDATA <b>MUST</b> consist of one or more DNS <code><character-string></code>s (see [[https://www.rfc-editor.org/rfc/rfc1035#section-3.3.14|RFC 1035 §3.3.14]]), each ≤255 bytes. |
There was a problem hiding this comment.
I’m not sure what you were exactly going for, but if you wanted to render that as <character-string>, the < and > is done twice to the point it has an unintended outcome:
This is what the rendered file looks like:
I think one of the following would have the intended outcome:
Suggested change
| The TXT RR’s RDATA <b>MUST</b> consist of one or more DNS <code><character-string></code>s (see [[https://www.rfc-editor.org/rfc/rfc1035#section-3.3.14|RFC 1035 §3.3.14]]), each ≤255 bytes. | |
| The TXT RR’s RDATA <b>MUST</b> consist of one or more DNS <code><character-string></code>s (see [[https://www.rfc-editor.org/rfc/rfc1035#section-3.3.14|RFC 1035 §3.3.14]]), each ≤255 bytes. |
Suggested change
| The TXT RR’s RDATA <b>MUST</b> consist of one or more DNS <code><character-string></code>s (see [[https://www.rfc-editor.org/rfc/rfc1035#section-3.3.14|RFC 1035 §3.3.14]]), each ≤255 bytes. | |
| The TXT RR’s RDATA <b>MUST</b> consist of one or more DNS <character-string>s (see [[https://www.rfc-editor.org/rfc/rfc1035#section-3.3.14|RFC 1035 §3.3.14]]), each ≤255 bytes. |
bip-0353.mediawiki
Outdated
| Clients resolving Bitcoin payment instructions MUST ignore any TXT records at the same label which do not begin with (ignoring case) "bitcoin:". Resolvers encountering multiple "bitcoin:"-matching TXT records at the same label MUST treat the records as invalid and refuse to use any payment instructions therein. | ||
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| Clients resolving Bitcoin payment instructions MUST concatenate all strings in the TXT record before processing the complete URI.<ref>TXT records are defined as "one or more character-strings" in [[https://www.rfc-editor.org/rfc/rfc1035#section-3.3.14|RFC 1035]], and a "character-string" is a single byte (with a max value of 255) followed by that many characters.</ref> | ||
| Clients resolving Bitcoin payment instructions <b>MUST</b> reconstruct the <code>bitcoin:</code> URI by concatenating the TXT RR’s <code><character-string></code> fields in <b>RDATA order</b>, without inserting separators, before parsing.<ref>DNS TXT RDATA consists of one or more length-prefixed strings with a maximum of 255 bytes of content; see RFC 1035 §3.3.14.</ref> |
murchandamus
added
the
PR Author action required
Fix markup: use literal <character-string> instead of html entities <…>
murchandamus
removed
the
PR Author action required
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Clarifies existing intent without changing the on‑wire format.
• Publishers: one TXT RR whose RDATA may contain multiple s (≤255 bytes each, RFC 1035 §3.3.14).
• Clients: concatenate the RR’s strings in RDATA order (no separators) before parsing; do not concatenate across multiple TXT RRs; if multiple bitcoin: TXT RRs exist at the same name, treat as invalid.