What is the complete reaction for Cyanide ions reacting with Thiosulfate?

I was recently studying about the properties of Sodium Thiosulfate, where I came across the fact that $\ce{S2O3^2-}$ reacts with $\ce{CN-}$ ions to produce $\ce{SCN-}$ ions. This was quite useful in treating cyanide poisoning. 


I have tried to find the complete reaction, but with no success. I believe this must be a redox reaction, since $\ce{S2O3^2-}$ has an average oxidation state of $+2$, while $\ce{SCN-}$ has a state of $-2$ (correct me if this is wrong). Can someone give me the complete reaction? 




1. [Source 1](https://www.chemicalaid.com/tools/equationbalancer.php?equation=Na2S2O3%20%2B%20NaCN%20%3D%20Na2SO3%20%2B%20NaSCN)(If you consider $\ce{Na+}$ as counterions)


$$\ce{Na2S2O3 + NaCN -> Na2SO3 + NaSCN}$$



> 
> Sodium thiosulfate reacts with sodium cyanide to produce sodium
>  sulfite and sodium thiocyanate.
> 
> 
> 


2. [Source 2](http://chemiday.com/en/reaction/3-1-0-2133)(If you consider $\ce{Ag+}$ and $\ce{Na+}$ as counterions for cyanide and thiosulfate ion respectively)


$$\ce{AgCN + 2Na2S2O3 → Na3[Ag(S2O3)2] + NaCN}$$



> 
> Silver(I) cyanide react with sodium thiosulfate to produce sodium
>  dithiosulfatoargentate(I) and sodium cyanide.
> 
> 
> 


In this case, thiocyanate does not form, rather a complex forms.


Explanation of this reaction can be found by observing the related reactions given in the [Wikipedia article of sodium thiosulfate](https://en.m.wikipedia.org/wiki/Sodium_thiosulfate).



> 
> Silver halides, e.g., AgBr are typical components of photographic
>  emulsions, dissolve upon treatment with aqueous thiosulfate:
> 
> 
> $$\ce{2S2O3^{2−} + AgBr → [Ag(S2O3)2]^{3−} + Br^{−}}$$
> 
> 
> 


Since, $\ce{CN-}$ and $\ce{Br-}$ hold same charge, you can easily replace it with silver bromide with silver cyanide to get cyanide ions as products.


Furthermore:



> 
> Sodium thiosulfate is a component of an
>  alternative lixiviant to cyanide for extraction of gold to form a
>  strong soluble complex $\ce{[Au(S2O3)2]^{3−}}$. The advantage of this
>  approach is that thiosulfate is essentially not toxic and that ore
>  types that are refractory to gold
>  cyanidation (e.g. carbonaceous or Carlin-type ores) can be leached by
>  thiosulfate. Some problems include the high consumption of
>  thiosulfate, and the lack of a suitable recovery technique, since
>  $\ce{[Au(S2O3)2]^{3−}}$ does not adsorb to activated carbon, which is
>  the standard technique used in gold cyanidation to separate the gold
>  complex from the ore slurry.
> 
> 
> 


This process is also suitable for silver extraction using sodium thiosulfate and silver cyanide to form corresponding silver complex, $\ce{[Ag(S2O3)2]^{3-}}$. Just replace gold cyanide with silver cyanide and it will work pretty much well.


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