BitcoinCash/specification
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@@ -28,4 +28,170 @@ Additionally, in order for the combined script to be valid, the following must b
- **Max Script Length** - the locking and unlocking script must each be less than the max script length of 10,000 bytes (for a combined script maximum of 20,000 bytes). - **Max Script Length** - the locking and unlocking script must each be less than the max script length of 10,000 bytes (for a combined script maximum of 20,000 bytes).
- **Contained Control Flow** - an IF/ELSE block cannot start in the unlocking script and end in the locking script, the script must be in the top-level scope when the locking script execution begins. - **Contained Control Flow** - an IF/ELSE block cannot start in the unlocking script and end in the locking script, the script must be in the top-level scope when the locking script execution begins.
- **Permitted Operations Only** - the locking script must not contain. - **Permitted Operations Only** - the locking script must not contain.
- **Push Only** - the unlocking script must contain only push operations (i.e. those with op codes 0x60 or less). Added in [HF20181115](/protocol/forks/HF20181115). - **Push Only** - the unlocking script must contain only push operations (i.e. those with op codes 0x60 or less). Added in [HF20181115](/protocol/forks/HF20181115).
## Op Codes
The table below lists the currently allocated op codes. Op codes marked with **(ignored)** are permitted but will do nothing when executed. Op codes marked with **(disabled)** are permitted in scripts so long as they are not executed. Op codes marked with **(do not use)** will make a transaction invalid merely be being present.
| Op Code Range | Name |
|--|--|
| 0x00 | OP_0 / OP_FALSE |
| 0x01 - 0x4B | [push data](/protocol/blockchain/script/op-codes/push-data) |
| 0x4C | OP_PUSHDATA1 |
| 0x4D | OP_PUSHDATA2 |
| 0x4E | OP_PUSHDATA4 |
| 0x4F | OP_1NEGATE |
| 0x50 | OP_RESERVED **(disabled)** |
| 0x51 | OP_1 / OP_TRUE |
| 0x52 | OP_2 |
| 0x53 | OP_3 |
| 0x54 | OP_4 |
| 0x55 | OP_5 |
| 0x56 | OP_6 |
| 0x57 | OP_7 |
| 0x58 | OP_8 |
| 0x59 | OP_9 |
| 0x5A | OP_10 |
| 0x5B | OP_11 |
| 0x5C | OP_12 |
| 0x5D | OP_13 |
| 0x5E | OP_14 |
| 0x5F | OP_15 |
| 0x60 | OP_16 |
| 0x61 | OP_NOP |
| 0x62 | OP_VER **(disabled)** |
| 0x63 | OP_IF |
| 0x64 | OP_NOTIF |
| 0x65 | OP_VERIF **(do not use)** |
| 0x66 | OP_VERNOTIF **(do not use)** |
| 0x67 | OP_ELSE |
| 0x68 | OP_ENDIF |
| 0x69 | OP_VERIFY |
| 0x6A | OP_RETURN |
| 0x6B | OP_TOALTSTACK |
| 0x6C | OP_FROMALTSTACK |
| 0x6D | OP_2DROP |
| 0x6E | OP_2DUP |
| 0x6F | OP_3DUP |
| 0x70 | OP_2OVER |
| 0x71 | OP_2ROT |
| 0x72 | OP_2SWAP |
| 0x73 | OP_IFDUP |
| 0x74 | OP_DEPTH |
| 0x75 | OP_DROP |
| 0x76 | OP_DUP |
| 0x77 | OP_NIP |
| 0x78 | OP_OVER |
| 0x79 | OP_PICK |
| 0x7A | OP_ROLL |
| 0x7B | OP_ROT |
| 0x7C | OP_SWAP |
| 0x7D | OP_TUCK |
| 0x7E | OP_CAT |
| 0x7F | OP_SUBSTR |
| 0x80 | OP_LEFT |
| 0x81 | OP_RIGHT |
| 0x82 | OP_SIZE |
| 0x83 | OP_INVERT |
| 0x84 | OP_AND |
| 0x85 | OP_OR |
| 0x86 | OP_XOR |
| 0x87 | OP_EQUAL |
| 0x88 | OP_EQUALVERIFY |
| 0x89 | OP_RESERVED1 **(do not use)** |
| 0x8A | OP_RESERVED2 **(do not use)** |
| 0x8B | OP_1ADD |
| 0x8C | OP_1SUB |
| 0x8D | OP_2MUL |
| 0x8E | OP_2DIV |
| 0x8F | OP_NEGATE |
| 0x90 | OP_ABS |
| 0x91 | OP_NOT |
| 0x92 | OP_0NOTEQUAL |
| 0x93 | OP_ADD |
| 0x94 | OP_SUB |
| 0x95 | OP_MUL |
| 0x96 | OP_DIV |
| 0x97 | OP_MOD |
| 0x98 | OP_LSHIFT |
| 0x99 | OP_RSHIFT |
| 0x9A | OP_BOOLAND |
| 0x9B | OP_BOOLOR |
| 0x9C | OP_NUMEQUAL |
| 0x9D | OP_NUMEQUALVERIFY |
| 0x9E | OP_NUMNOTEQUAL |
| 0x9F | OP_LESSTHAN |
| 0xA0 | OP_GREATERTHAN |
| 0xA1 | OP_LESSTHANOREQUAL |
| 0xA2 | OP_GREATERTHANOREQUAL |
| 0xA3 | OP_MIN |
| 0xA4 | OP_MAX |
| 0xA5 | OP_WITHIN |
| 0xA6 | OP_RIPEMD160 |
| 0xA7 | OP_SHA1 |
| 0xA8 | OP_SHA256 |
| 0xA9 | OP_HASH160 |
| 0xAA | OP_HASH256 |
| 0xAB | OP_CODESEPARATOR |
| 0xAC | OP_CHECKSIG |
| 0xAD | OP_CHECKSIGVERIFY |
| 0xAE | OP_CHECKMULTISIG |
| 0xAF | OP_CHECKMULTISIGVERIFY |
| 0xB0 | OP_NOP1 **(ignored)** |
| 0xB1 | OP_CHECKLOCKTIMEVERIFY |
| 0xB2 | OP_CHECKSEQUENCEVERIFY |
| 0xB3 | OP_NOP4 **(ignored)** |
| 0xB4 | OP_NOP5 **(ignored)** |
| 0xB5 | OP_NOP6 **(ignored)** |
| 0xB6 | OP_NOP7 **(ignored)** |
| 0xB7 | OP_NOP8 **(ignored)** |
| 0xB8 | OP_NOP9 **(ignored)** |
| 0xB9 | OP_NOP10 **(ignored)** |
| 0xBA | OP_CHECKDATASIG |
| 0xBB | OP_CHECKDATASIGVERIFY |
| 0xBC - 0xFF | Unused **(disabled)** |
### Node-Specific Behavior
Some node implementations define custom op codes.
#### bchd
| Op Code Range | Name |
|--|--|
| 0xFA | OP_SMALLINTEGER |
| 0xFB | OP_PUBKEYS |
| 0xFD | OP_PUBKEYHASH |
| 0xFE | OP_PUBKEY |
| 0xFF | OP_INVALIDOPCODE |
#### Bitcoin ABC
| Op Code Range | Name |
|--|--|
| 0xF0 | OP_PREFIX_BEGIN |
| 0xF7 | OP_PREFIX_END |
| 0xFF | OP_INVALIDOPCODE |
#### Bitcoin Unlimited
| Op Code Range | Name |
|--|--|
| 0xF0 | OP_BIGINTEGER |
| 0xF1 | OP_DATA |
| 0xFA | OP_SMALLINTEGER |
| 0xFB | OP_PUBKEYS |
| 0xFD | OP_PUBKEYHASH |
| 0xFE | OP_PUBKEY |
| 0xFF | OP_INVALIDOPCODE |
#### Flowee the Hub
| Op Code Range | Name |
|--|--|
| 0xFA | OP_SMALLINTEGER |
| 0xFB | OP_PUBKEYS |
| 0xFD | OP_PUBKEYHASH |
| 0xFE | OP_PUBKEY |
| 0xFF | OP_INVALIDOPCODE |