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Separate fragment params with - instead of +

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Since only Bull Bitcoin Mobile and Cake wallet are currently deployed in
production, both using PDK, and the `+` character is causing some
friction, this change seems justified to avoid similar issues with
future implementations.
This commit is contained in:
Yuval Kogman 2025-07-03 16:24:02 +02:00
parent c17a3dbceb
commit 43f9688600
1 changed files with 16 additions and 2 deletions
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18
bip-0077.md
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@ -234,7 +234,7 @@ These session-specific parameters use a bech32-inspired encoding.
The HRP is used as the parameter key, followed by the '1' separator,
followed by the parameter value encoded using the bech32 character set in
[uppercase](#uppercase-url). No checksum is used. Parameters are separated
by a `+` character.
by a `-` character (previously a `+` separator [was specified](#bip-77)).
The following parameters are defined, and must be provided in reverse
lexicographical order:
@ -253,7 +253,7 @@ lexicographical order:
time](https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap04.html#tag_04_16).
For example, a properly encoded endpoint Bitcoin URI looks like this
`bitcoin:tb1q6q6de88mj8qkg0q5lupmpfexwnqjsr4d2gvx2p?amount=0.00666666&pjos=0&pj=HTTPS://PAYJO.IN/TXJCGKTKXLUUZ%23RK1Q0DJS3VVDXWQQTLQ8022QGXSX7ML9PHZ6EDSF6AKEWQG758JPS2EV+OH1QYPM59NK2LXXS4890SUAXXYT25Z2VAPHP0X7YEYCJXGWAG6UG9ZU6NQ+EX1WKV8CEC`
`bitcoin:tb1q6q6de88mj8qkg0q5lupmpfexwnqjsr4d2gvx2p?amount=0.00666666&pjos=0&pj=HTTPS://PAYJO.IN/TXJCGKTKXLUUZ%23RK1Q0DJS3VVDXWQQTLQ8022QGXSX7ML9PHZ6EDSF6AKEWQG758JPS2EV-OH1QYPM59NK2LXXS4890SUAXXYT25Z2VAPHP0X7YEYCJXGWAG6UG9ZU6NQ-EX1WKV8CEC`
### Sender Original PSBT Messaging
@ -711,6 +711,8 @@ receiver also specifies the directory.
## Backwards compatibility
### BIP 78
Senders not supporting Payjoin will just ignore the `pj` parameter and
proceed to typical address-based transaction flows.
@ -726,6 +728,18 @@ seconds or else the directory should respond with an `unavailable` JSON
error code as [defined in BIP
78](https://github.com/bitcoin/bips/blob/master/bip-0078.mediawiki#receivers-well-known-errors).
### BIP 77
A previous version of this document specified `+` as the fragment parameter
separator. This can cause issues due to a common convention (not specified in
RFC 3986, but in RFC 1866 in relation to HTML form submission and query
parameters, not URI fragments) of representing ` ` with `+` in URI query
parameters.
As a result of this change implementations are encouraged to still accept `+`
delimited fragment parameters for during 2026 (a grace period of just under 6
months).
## Reference implementation
A production reference implementation client can be found at