1. I recommend you putting the signature and value in different lines, if you have a very long line Skript will throw an StackOverFlowError (and if it does,.
2. I don't know where you got that syntax but the real one is:

Code (Skript):

1. skin [texture] with value %string% signature %string%

so, you may use it as:

Code (Skript):

1. set {_value} to "eyJ0aW1lc3RhbXAiOjE1MTY5NTE4NzQ0NTYsInByb2ZpbGVJZCI6ImQxY2VjOWFkMWRhODQxNzliMWU1NjA0ZjcyYmZiMjI2IiwicHJvZmlsZU5hbWUiOiJydXRnZXI0NjUiLCJzaWduYXR1cmVSZXF1aXJlZCI6dHJ1ZSwidGV4dHVyZXMiOnsiU0tJTiI6eyJ1cmwiOiJodHRwOi8vdGV4dHVyZXMubWluZWNyYWZ0Lm5ldC90ZXh0dXJlL2FkNzE4ZjNhOTFkMjdkZWNhNGJiMTA0NTZmYjY5N2RlMmM3ZWViMTY3NGZhOTI3MWZiOWRmYTc2YWMwNTI0MCJ9fX0="
2. set {_signature} to "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"
3. set {_skin} to skin with value {_value} signature {_signature}

By the way, what I do is save my skins in a JSON file such as:

Code ( (Unknown Language)):

1. {
2.     "Necromacer":
3.     {
4.         "value": "eyJ0aW1lc3RhbXAiOjE1MTY5NTE4NzQ0NTYsInByb2ZpbGVJZCI6ImQxY2VjOWFkMWRhODQxNzliMWU1NjA0ZjcyYmZiMjI2IiwicHJvZmlsZU5hbWUiOiJydXRnZXI0NjUiLCJzaWduYXR1cmVSZXF1aXJlZCI6dHJ1ZSwidGV4dHVyZXMiOnsiU0tJTiI6eyJ1cmwiOiJodHRwOi8vdGV4dHVyZXMubWluZWNyYWZ0Lm5ldC90ZXh0dXJlL2FkNzE4ZjNhOTFkMjdkZWNhNGJiMTA0NTZmYjY5N2RlMmM3ZWViMTY3NGZhOTI3MWZiOWRmYTc2YWMwNTI0MCJ9fX0=",
5.         "signature": "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"
6.     },
7.     "Fujinomiya":
8.     {
9.         "value": "eyJ0aW1lc3RhbXAiOjE1MTY5Nzg2MDk4OTUsInByb2ZpbGVJZCI6ImMxZWQ5N2Q0ZDE2NzQyYzI5OGI1ODFiZmRiODhhMjFmIiwicHJvZmlsZU5hbWUiOiJ5b2xvX21hdGlzIiwic2lnbmF0dXJlUmVxdWlyZWQiOnRydWUsInRleHR1cmVzIjp7IlNLSU4iOnsidXJsIjoiaHR0cDovL3RleHR1cmVzLm1pbmVjcmFmdC5uZXQvdGV4dHVyZS9jNzBjZjMxYWM3YzgzNGFlMWYxZDA3NGIyODkzODViMmYyYmViZmNkNzZjZDI0MTg5MTUxNTg2ZGQ2M2RhNmMifX19",
10.         "signature": "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"
11.     }
12. }

And then read it the following way:

Code (Skript):

1. on script load:
2.  
3.   set {_skins} to join (file contents of "plugins/MundoSK/skins.json") by system property line separator # You can put it wherever you want
4.   map json {_skins} to {_skins::*} # this requires skript-json, can be done with MundoSK though
5.  
6.   loop tree of {_skins::*}:
7.  
8.     set {_indexes::*} to split branch by "::"
9.     if {_indexes::2} is "value":
10.       set {_current-value} to loop-value
11.     else:
12.       set {_current-signature} to loop-value
13.  
14.     if {_current-value} and {_current-signature} is set:
15.       set {skin::%{_indexes::1}%} to skin with value {_current-value} signature {_current-signature}
16.       clear {_current-value} and {_current-signature}
17.  
18. on script unload:
19.  
20.   clear {skin::*}

And finally, use them wherever you want, example:

Code (Skript):

1. command /skin <name="Fujinomiya">:
2.   trigger:
3.     set displayed skin of sender to {skin::%arg-1%}

 

Tlatoani updated MundoSK with a new update entry:

MundoSK 1.8.5 - Player Skull Improvements

Read the rest of this update entry...