user82069: Try to use the Lockunspend RPC in bitcoin core wallet console. But always get wrong, and google it can't find answer. 
My input is: 
lockunspent false "[{"txid":"c3fa34606ae3ea416ff640d97414ef6a0a8afcebfbe2c60403ad60c0d961f04c","vout":0}]"

Is anyone can teach me where I am wrong? Thanks 

user38618: The problem is, you should to escape the inner quotes:
lockunspent false "[{\"txid\":\"c3fa34606ae3ea416ff640d97414ef6a0a8afcebfbe2c60403ad60c0d961f04c\",\"vout\":0}]"


82069: <p>Try to use the Lockunspend RPC in bitcoin core wallet console. But always get wrong, and google it can't find answer. </p>

<p>My input is: </p>

<pre><code>lockunspent false "[{"txid":"c3fa34606ae3ea416ff640d97414ef6a0a8afcebfbe2c60403ad60c0d961f04c","vout":0}]"
</code></pre>

<p>Is anyone can teach me where I am wrong? Thanks </p>
 38618: <p>The problem is, you should to escape the inner quotes:</p>

<pre><code>lockunspent false "[{\"txid\":\"c3fa34606ae3ea416ff640d97414ef6a0a8afcebfbe2c60403ad60c0d961f04c\",\"vout\":0}]"
</code></pre>
