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OP_CAT: A Big Step towards Bitcoin Contracts, From Vault to General Computing

OP_CAT was originally part of the Bitcoin official opcodes, allowing string concatenations on the stack. OP_CAT can concatenate two elements in the stack and push the result back to the stack. OP_CAT opcodes can cause stack elements to grow exponentially, which can cause memory usage to grow exponentially with script size, ultimately resulting in similar denial of service attack. Therefore, Satoshi Nakamoto removed OP_CATout of caution on August 15, 2010.



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OP_CAT: A Big Step towards Bitcoin Contracts, From Vault to General Computing

https://blog.bitlayer.org/opcat_a_big_step_towards_Bitcoin_contracts

OP_CAT was originally part of the Bitcoin official opcodes, allowing string concatenations on the stack. OP_CAT can concatenate two elements in the stack and push the result back to the stack. OP_CAT opcodes can cause stack elements to grow exponentially, which can cause memory usage to grow exponentially with script size, ultimately resulting in similar denial of service attack. Therefore, Satoshi Nakamoto removed OP_CATout of caution on August 15, 2010.



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https://blog.bitlayer.org/opcat_a_big_step_towards_Bitcoin_contracts

OP_CAT: A Big Step towards Bitcoin Contracts, From Vault to General Computing

OP_CAT was originally part of the Bitcoin official opcodes, allowing string concatenations on the stack. OP_CAT can concatenate two elements in the stack and push the result back to the stack. OP_CAT opcodes can cause stack elements to grow exponentially, which can cause memory usage to grow exponentially with script size, ultimately resulting in similar denial of service attack. Therefore, Satoshi Nakamoto removed OP_CATout of caution on August 15, 2010.

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      OP_CAT was originally part of the Bitcoin official opcodes, allowing string concatenations on the stack. OP_CAT can concatenate two elements in the stack and push the result back to the stack. OP_CAT opcodes can cause stack elements to grow exponentially, which can cause memory usage to grow exponentially with script size, ultimately resulting in similar denial of service attack. Therefore, Satoshi Nakamoto removed OP_CATout of caution on August 15, 2010.
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