diff --git a/doc/standards/op_return-prefix-guideline.md b/doc/standards/op_return-prefix-guideline.md
index 35a24f246..66e354bf4 100644
--- a/doc/standards/op_return-prefix-guideline.md
+++ b/doc/standards/op_return-prefix-guideline.md
@@ -1,31 +1,32 @@
 # Prefix Guideline for OP_RETURN on eCash
 
 This document extends the app dev OP_RETURN convention described [here](https://github.com/bitcoincashorg/bitcoincash.org/blob/master/spec/op_return-prefix-guideline.md).
 
 If you are a developer using an OP_RETURN prefix for your app, please claim your protocol identifier by submitting a diff to this repo, including:
 
 -   A display name for the protocol
 -   An author (or list of authors)
 -   A URL pointing to the specification of the protocol
 -   An eCash address (to avoid ambiguity and to later modify names / authors / URL)
 
 Protocol identifiers below are listed how they appear in eCash transaction outputs.
 
 | Protocol Identifier | Display Name      | Authors                             | eCashAddress                                     | SpecificationUrl                                              | Payload                                      |
 | ------------------- | ----------------- | ----------------------------------- | ------------------------------------------------ | ------------------------------------------------------------- | -------------------------------------------- |
 | 534c5000            | eToken            | SLP devs                            | ecash:qq2p8mu0gmxfzva2g36kh70efp8hx7qg7qh20l0qls | https://github.com/simpleledger/slp-specifications            | See spec                                     |
 | 46555a00            | CashFusion        | Jonald Fyookball and Mark Lundeberg | ecash:qqqxxmjyavdkwdj6npa5w6xl0fzq3wc5fu6s5x69jj | https://github.com/cashshuffle/spec/blob/master/CASHFUSION.md | See spec                                     |
 | 00746162            | Cashtab Message   | Bitcoin ABC                         | ecash:pqnqv9lt7e5vjyp0w88zf2af0l92l8rxdg2jj94l5j | N/A                                                           | `<00746162> <utf8 msg>`                      |
 | 65746162            | Cashtab Encrypted | Bitcoin ABC                         | ecash:pqnqv9lt7e5vjyp0w88zf2af0l92l8rxdg2jj94l5j | https://cashtab.com/                                          | `<65746162> <encrypted utf8 msg>`            |
 | 64726f70            | Airdrop           | Bitcoin ABC                         | ecash:pqnqv9lt7e5vjyp0w88zf2af0l92l8rxdg2jj94l5j | https://cashtab.com/                                          | `<64726f70> <tokenId of airdrop recipients>` |
 | 2E786563            | Namespace Alias   | Bitcoin ABC                         | ecash:pqnqv9lt7e5vjyp0w88zf2af0l92l8rxdg2jj94l5j | See ../standards/ecash-alias.md                               | See spec                                     |
 | 50415900            | PayButton         | Blockchain Ventures                 | ecash:qrmm7edwuj4jf7tnvygjyztyy0a0qxvl7quss2vxek | See ../standards/paybutton.md                                 | See spec                                     |
 | 63686174            | eCash Chat        | Bitcoin ABC                         | ecash:qz9aa3yeuspe569xqtmn0f8aaxwmdjz4l58z6hzv9u | N/A                                                           | `<63686174> <utf8 msg>`                      |
+| 70617977            | Paywall tx       | Bitcoin ABC                         | ecash:qz9aa3yeuspe569xqtmn0f8aaxwmdjz4l58z6hzv9u | N/A                                                           | `<70617977> <txid>`                      |
 
 ---
 
 ### Resources
 
 [op_return-prefix-guideline.md](https://github.com/bitcoincashorg/bitcoincash.org/blob/master/spec/op_return-prefix-guideline.md)
 
 [protocols.csv](https://github.com/bitcoincashorg/bitcoincash.org/blob/master/etc/protocols.csv)