BCH opcode reference

139 entries covering all 256 byte values, current to the May 2026 upgrade. Including the ones Bitcoin Core is still debating.

Oldest check

push

Hex Opcode Stack Since In BTC
0x00 OP_0 ∅ → 0 original same
0x01–0x4b OP_PUSHBYTES_N ∅ → data original same
0x4c OP_PUSHDATA1 ∅ → data original same
0x4d OP_PUSHDATA2 ∅ → data original same
0x4e OP_PUSHDATA4 ∅ → data original same
0x4f OP_1NEGATE ∅ → -1 original same
0x51 OP_1 ∅ → 1 original same
0x52 OP_2 ∅ → 2 original same
0x53 OP_3 ∅ → 3 original same
0x54 OP_4 ∅ → 4 original same
0x55 OP_5 ∅ → 5 original same
0x56 OP_6 ∅ → 6 original same
0x57 OP_7 ∅ → 7 original same
0x58 OP_8 ∅ → 8 original same
0x59 OP_9 ∅ → 9 original same
0x5a OP_10 ∅ → 10 original same
0x5b OP_11 ∅ → 11 original same
0x5c OP_12 ∅ → 12 original same
0x5d OP_13 ∅ → 13 original same
0x5e OP_14 ∅ → 14 original same
0x5f OP_15 ∅ → 15 original same
0x60 OP_16 ∅ → 16 original same

reserved

Hex Opcode Stack Since In BTC
0x50 OP_RESERVED reserved ∅ → (fails) original same
0x62 OP_VER reserved ∅ → (fails) original same
0xb0 OP_NOP1 nop ∅ → ∅ original same
0xb3 OP_NOP4 nop ∅ → ∅ original proposed-for-btc
0xb4 OP_NOP5 nop ∅ → ∅ original same
0xb5 OP_NOP6 nop ∅ → ∅ original same
0xb6 OP_NOP7 nop ∅ → ∅ original same
0xb7 OP_NOP8 nop ∅ → ∅ original same
0xb8 OP_NOP9 nop ∅ → ∅ original same
0xb9 OP_NOP10 nop ∅ → ∅ original same
0xbd OP_UNKNOWN189 reserved ∅ → (fails) Never assigned not-in-btc
0xbe OP_UNKNOWN190 reserved ∅ → (fails) Never assigned not-in-btc
0xbf OP_UNKNOWN191 reserved ∅ → (fails) Never assigned not-in-btc
0xd4–0xff OP_UNKNOWN212–255 reserved ∅ → (fails) Never assigned not-in-btc

control

Hex Opcode Stack Since In BTC
0x61 OP_NOP ∅ → ∅ original same
0x63 OP_IF cond → ∅ original different
0x64 OP_NOTIF cond → ∅ original different
0x65 OP_BEGIN ∅ → ∅ 2026-05-upgrade not-in-btc
0x66 OP_UNTIL cond → ∅ 2026-05-upgrade not-in-btc
0x67 OP_ELSE ∅ → ∅ original same
0x68 OP_ENDIF ∅ → ∅ original same
0x69 OP_VERIFY x → ∅ original same
0x6a OP_RETURN ∅ → (fails) original same

stack

Hex Opcode Stack Since In BTC
0x6b OP_TOALTSTACK x → ∅ original same
0x6c OP_FROMALTSTACK ∅ → x original same
0x6d OP_2DROP a b → ∅ original same
0x6e OP_2DUP a b → a b a b original same
0x6f OP_3DUP a b c → a b c a b c original same
0x70 OP_2OVER a b c d → a b c d a b original same
0x71 OP_2ROT a b c d e f → c d e f a b original same
0x72 OP_2SWAP a b c d → c d a b original same
0x73 OP_IFDUP x → x | x x original same
0x74 OP_DEPTH ∅ → n original same
0x75 OP_DROP x → ∅ original same
0x76 OP_DUP x → x x original same
0x77 OP_NIP a b → b original same
0x78 OP_OVER a b → a b a original same
0x79 OP_PICK … x … n → … x … x original same
0x7a OP_ROLL … x … n → … … x original same
0x7b OP_ROT a b c → b c a original same
0x7c OP_SWAP a b → b a original same
0x7d OP_TUCK a b → b a b original same

splice

Hex Opcode Stack Since In BTC
0x7e OP_CAT a b → a‖b 2018-05-upgrade proposed-for-btc
0x7f OP_SPLIT x n → x[0..n) x[n..) 2018-05-upgrade not-in-btc
0x80 OP_NUM2BIN n size → bin 2018-05-upgrade not-in-btc
0x81 OP_BIN2NUM bin → n 2018-05-upgrade not-in-btc
0x82 OP_SIZE x → x len original same
0xbc OP_REVERSEBYTES x → reverse(x) 2020-05-upgrade not-in-btc

bitwise

Hex Opcode Stack Since In BTC
0x83 OP_INVERT x → ~x 2026-05-upgrade disabled-in-btc
0x84 OP_AND a b → a&b 2018-05-upgrade disabled-in-btc
0x85 OP_OR a b → a|b 2018-05-upgrade disabled-in-btc
0x86 OP_XOR a b → a^b 2018-05-upgrade disabled-in-btc
0x87 OP_EQUAL a b → a==b original same
0x88 OP_EQUALVERIFY a b → ∅ original same
0x98 OP_LSHIFTBIN bin bits → bin<<bits 2026-05-upgrade disabled-in-btc
0x99 OP_RSHIFTBIN bin bits → bin>>bits 2026-05-upgrade disabled-in-btc

function

Hex Opcode Stack Since In BTC
0x89 OP_DEFINE body id → ∅ 2026-05-upgrade not-in-btc
0x8a OP_INVOKE … id → … 2026-05-upgrade not-in-btc

arithmetic

Hex Opcode Stack Since In BTC
0x8b OP_1ADD a → a+1 original same
0x8c OP_1SUB a → a-1 original same
0x8d OP_LSHIFTNUM a bits → a×2^bits 2026-05-upgrade disabled-in-btc
0x8e OP_RSHIFTNUM a bits → floor(a/2^bits) 2026-05-upgrade disabled-in-btc
0x8f OP_NEGATE a → -a original same
0x90 OP_ABS a → |a| original same
0x91 OP_NOT a → a==0 original same
0x92 OP_0NOTEQUAL a → a!=0 original same
0x93 OP_ADD a b → a+b original same
0x94 OP_SUB a b → a-b original same
0x95 OP_MUL a b → a×b 2022-05-upgrade disabled-in-btc
0x96 OP_DIV a b → a/b 2018-05-upgrade disabled-in-btc
0x97 OP_MOD a b → a%b 2018-05-upgrade disabled-in-btc
0x9a OP_BOOLAND a b → a&&b original same
0x9b OP_BOOLOR a b → a||b original same
0x9c OP_NUMEQUAL a b → a==b original same
0x9d OP_NUMEQUALVERIFY a b → ∅ original same
0x9e OP_NUMNOTEQUAL a b → a!=b original same
0x9f OP_LESSTHAN a b → a<b original same
0xa0 OP_GREATERTHAN a b → a>b original same
0xa1 OP_LESSTHANOREQUAL a b → a<=b original same
0xa2 OP_GREATERTHANOREQUAL a b → a>=b original same
0xa3 OP_MIN a b → min(a,b) original same
0xa4 OP_MAX a b → max(a,b) original same
0xa5 OP_WITHIN x min max → min<=x<max original same

crypto

Hex Opcode Stack Since In BTC
0xa6 OP_RIPEMD160 x → hash(x) original same
0xa7 OP_SHA1 x → hash(x) original same
0xa8 OP_SHA256 x → hash(x) original same
0xa9 OP_HASH160 x → hash(x) original same
0xaa OP_HASH256 x → hash(x) original same
0xab OP_CODESEPARATOR ∅ → ∅ original same
0xac OP_CHECKSIG sig pubkey → ok original different
0xad OP_CHECKSIGVERIFY sig pubkey → ∅ original different
0xae OP_CHECKMULTISIG dummy sig… m pubkey… n → ok original different
0xaf OP_CHECKMULTISIGVERIFY dummy sig… m pubkey… n → ∅ original different
0xba OP_CHECKDATASIG sig msg pubkey → ok 2018-11-upgrade not-in-btc
0xbb OP_CHECKDATASIGVERIFY sig msg pubkey → ∅ 2018-11-upgrade not-in-btc

locktime

Hex Opcode Stack Since In BTC
0xb1 OP_CHECKLOCKTIMEVERIFY t → t BIP-65 soft fork (2015), inherited at the 2017 split same
0xb2 OP_CHECKSEQUENCEVERIFY n → n BIP-112 soft fork (2016), inherited at the 2017 split same

introspection

Hex Opcode Stack Since In BTC
0xc0 OP_INPUTINDEX ∅ → i 2022-05-upgrade not-in-btc
0xc1 OP_ACTIVEBYTECODE ∅ → bytecode 2022-05-upgrade not-in-btc
0xc2 OP_TXVERSION ∅ → version 2022-05-upgrade not-in-btc
0xc3 OP_TXINPUTCOUNT ∅ → count 2022-05-upgrade not-in-btc
0xc4 OP_TXOUTPUTCOUNT ∅ → count 2022-05-upgrade not-in-btc
0xc5 OP_TXLOCKTIME ∅ → locktime 2022-05-upgrade not-in-btc
0xc6 OP_UTXOVALUE i → sats 2022-05-upgrade not-in-btc
0xc7 OP_UTXOBYTECODE i → bytecode 2022-05-upgrade not-in-btc
0xc8 OP_OUTPOINTTXHASH i → txhash 2022-05-upgrade not-in-btc
0xc9 OP_OUTPOINTINDEX i → n 2022-05-upgrade not-in-btc
0xca OP_INPUTBYTECODE i → bytecode 2022-05-upgrade not-in-btc
0xcb OP_INPUTSEQUENCENUMBER i → seq 2022-05-upgrade not-in-btc
0xcc OP_OUTPUTVALUE i → sats 2022-05-upgrade not-in-btc
0xcd OP_OUTPUTBYTECODE i → bytecode 2022-05-upgrade not-in-btc

token

Hex Opcode Stack Since In BTC
0xce OP_UTXOTOKENCATEGORY i → category[+cap] | 0 2023-05-cashtokens not-in-btc
0xcf OP_UTXOTOKENCOMMITMENT i → commitment | 0 2023-05-cashtokens not-in-btc
0xd0 OP_UTXOTOKENAMOUNT i → amount 2023-05-cashtokens not-in-btc
0xd1 OP_OUTPUTTOKENCATEGORY i → category[+cap] | 0 2023-05-cashtokens not-in-btc
0xd2 OP_OUTPUTTOKENCOMMITMENT i → commitment | 0 2023-05-cashtokens not-in-btc
0xd3 OP_OUTPUTTOKENAMOUNT i → amount 2023-05-cashtokens not-in-btc