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Summary: To disincentivize the use of other methods to embed data into the chain, in particular via P2SH, the default datacarriersize is raised from 80 byte to 220 byte, so it becomes the "cheapest" way of embedding data into the chain. The default value is changed when a flag is passed to `IsStandardTx` Test Plan: 1. Check, if a script with max custom provided payload size is considered standard, with and without the flag 2. Check, if a script with max custom provided payload size + 1 is considered non-standard, with and without the flag 3. Check, if a script with max old default payload size (83 byte total) is considered standard, when the HF is not active 4. Check, if a script with max old default payload size + 1 (84 byte total) is considered non-standard, when the HF is not active 5. Check, if a script with max new default payload size (223 byte total) is considered standard, when the HF is active 6. Check, if a script with max new default payload size + 1 (224 byte total) is considered non-standard, when the HF is active Via: make check Reviewers: O1 Bitcoin ABC, #bitcoin_abc, dexX7, schancel, matiu Reviewed By: O1 Bitcoin ABC, #bitcoin_abc, dexX7, schancel, matiu Subscribers: jasonbcox, matiu, schancel, deadalnix, teamcity Maniphest Tasks: T302 Differential Revision: https://reviews.bitcoinabc.org/D1158
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