# Practical Examples #### Example 1: Conditional Path Selection ``` OP_DEPTH OP_1 OP_EQUAL OP_IF OP_DROP OP_CHECKSIGVERIFY OP_RETURN OP_ENDIF OP_DEPTH OP_HASH160 OP_EQUALVERIFY OP_CHECKSIG ``` The script checks the depth of the stack. If there is just 1 item, it assumes it is a signature and checks it against a public key using OP\_CHECKSIGVERIFY followed by OP\_RETURN. If there is more than one item, it assumes a public key and signature, which it checks against a stored public key hash using OP\_EQUALVERIFY. #### Example 2: Multi-Path Verification ``` OP_DUP OP_IF OP_2 OP_CHECKMULTISIG OP_ELSE OP_CHECKSIG OP_ENDIF ``` The first conditional can be entered if either 1, 2, or 3 of the signing parties choose to sign. If a zero value is at the top of the stack initially, the second entity can sign using a single signature check. #### Example 3: Data Capture with Verification ``` OP_2DROP OP_CHECKSIG ``` The output being spent is used to capture data on the ledger which is not relevant to the spending of the token. The script drops two data items and then performs a signature check. This can be used with a scriptSig like: ``` ``` #### Example 4: Complex Verification Chain ``` OP_1SUB OP_DUP OP_TOALTSTACK OP_NOTIF OP_2 OP_2 OP_CHECKMULTISIG OP_FROMALTSTACK OP_DROP OP_ELSE OP_FROMALTSTACK OP_1SUB OP_NOTIF OP_CHECKSIG OP_ELSE OP_FALSE OP_RETURN OP_ENDIF OP_ENDIF ``` The spending party must indicate using an integer value of 1 or 2 which path they wish to take. The first entity requires a 2of2 multisignature solution with scriptSig: ``` <1> ``` The second entity would use: ``` <2> ``` If the top value is neither 1 nor 2, the script enters the nested OP\_ELSE statement where OP\_FALSE OP\_RETURN causes it to fail. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://hub.bsvblockchain.org/higher-learning/bsv-academy/bsv-opcodes/op_nop-op_ver/practical-examples.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.