mixHash is always zero and difficulty is always 2, what's the behavior of difficulty (prevrandao) opcode on bsc?

[wtdcode]

Question

What is the behavior of difficulty (prevrandao) opcode on the bsc? It seems that it always returns the difficulty but not prevrandao and I notice that the mixHash value in the header seems always 0 and difficulty is always 2, is that expected?

Steps to reproduce the behaviour

curl https://bsc-dataseed.bnbchain.org/ \
                                     -X POST \
                                     -H "Content-Type: application/json" \
                                     --data '{"method":"eth_getBlockByNumber","params":["0x2cabf02",false],"id":1,"jsonrpc":"2.0"}'

Response

{"jsonrpc":"2.0","id":1,"result":{"withdrawalsRoot":"0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421","withdrawals":[],"hash":"0x658dc8c5619528000959be420074ced513a75eb9a1f35bafa08bc0df9c9dcffa","parentHash":"0x08993cbb99da6dde7da083863ac592d931c347a4253899d181f0d93105eb485e","sha3Uncles":"0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347","miner":"0x38944092685a336cb6b9ea58836436709a2adc89","stateRoot":"0x71f820955ef6b1ce6059c41a992e51baa8d26389d3a8e581493270613549d120","transactionsRoot":"0x4e17829b7279c231b482173ae05c4c4f44da3ab1b794f95bdf5b0f57217a70e7","receiptsRoot":"0xb6292af8c1389262eebc7d43a429b0f33b19b47923768852459aa1f36f9eb271","logsBloom":"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","difficulty":"0x2","number":"0x2cabf02","gasLimit":"0x83f4b54","gasUsed":"0x11db618","timestamp":"0x67b7ea54","extraData":"0xd88301040f846765746888676f312e32322e34856c696e757800000060adae27f8b5831effffb86083920bbf18fcd69a7596e55a62523f3d134b596de943b27f29df6b9186f6f9ab16a9114e51a7beb3e666c07f95919b790c0b4fc0f8ba3cd631a464b1794d37a79089c9e2c0d96e12180a9ef21bf9dfbad1e5c6e794e12f699ff8af29866b54d4f84c8402cabf00a0a4aa34d53c664b74fc0ad166a845dae37c69807b6569cda8210c27d71c1f64238402cabf01a008993cbb99da6dde7da083863ac592d931c347a4253899d181f0d93105eb485e80bc6e2e68a4296897c14e9c52053639c49110eae5dca9cf71828e64409369411f4f9381116a491033e0ffe8fee7d4d2d07997226eaf6718a7a11e9c87a020530e00","mixHash":"0x0000000000000000000000000000000000000000000000000000000000000000","nonce":"0x0000000000000000","size":"0x10222","totalDifficulty":"0x58ca9cb","baseFeePerGas":"0x0","transactions":["0xb7ec2cb5babac520131e4f2dbfc303dc8b978c88354610a7d318b19bdd6d8147","0xc7bc6481274cee32824e9cb8d8e035387bf2e777be54216dad28f4d310b598ad","0xd48c23acd7f28d3731fa908baaf77fc9282eda7be5beee2a8cd0e8dc97eab3c1","0x5550487eead617616f1b09d456ca839b71f0e973a0121ae42a77deda3635ea8b","0x592b2d79e4efc7ee955fa6e5952690ec1c918694dd2b83585f6541a8ab61be96","0xbd4059550e7881dc5291104a1ebf341c8e671f6855d5413298a650b19921a65c","0x378bd38df2c566123f8066a52db3677a4fd046776e52e7a894bd722d8afda329","0xfebfacfc829d46843667a7724c6a934f597bd2fc7a2b9e16336cc2e06ce5faa0","0xd1ec260e0fc76b0db35c3216106dd71e1056a4c600e4f01256d4a69d90f787b0","0x75b753b29bdf5887d0d9ef94704f2eed01745a8f7e1571ee1f4c3bca93391476","0xbe9eeefd01fad37bd6d9e1c738d2d186980b5d5aed39fd5bd71c1573cc21593d","0xd5f62c854842b193bad711813d2a278c72b74fd3584600b7ced5dd05fd168f53","0x0ffaa694645ae9812f05a60540aa1521c3d75ac147ecb7f733ef43ec90f20377","0x91c330d4f68366da1e2e357363292880860b4d0da872b1cd960cba45c33348de","0x3eb62ef6d8dba5d708d9b6448ccda7c6a75ef5215c6e5fcac1a3153de6f392a6","0x0f6197bbcea70b73e2aa9212cd34977ced48a42f818f51c3f41c84586618ffbe","0x9bd6cb63684ee248cb438c579d7c045e8dac4651007f80d88dffb2b32e1c8cb7","0x91da8864b1bf6d8e3a58d099c48882c45218b625ef3bc360c62eeceedce7524b","0xca18c137d5c18286ba0d54694dd230f185ec2e8eb50aca000ec64fcb801a4677","0xb58b9cb07a30daddabd05ab3561ed69752656276508043c93de2c3408e05d771","0x21a4a598a00f29c51895d2d73118c0088df64f509a2a34368fda2e5f9e3f11f9","0x7da38a44056da0a65f0ac90140ae9b934c3861c7c84a48511332e85e9daf8d94","0x97a66092a95fd56c37151f02a02e0e59827ae24c34b87ebef2faf259f2ddde46","0xc6a5f6ae7531d33773bcd69086206540fd8fac31b6e9ea1740c865d6dd407fe0","0x8fbd6255c7847fc21595c477ffc7969a1ca4c7671301fc17359b28b23058e832","0x98a79397a11cfed6e4a923ccdfeb840461b5dfdb41724bf706792e18b1e00fb3","0x7d835d8f907bd8d5247cb06489797645e531ddc09a717c5b96363e487f8d69bc","0x827cf1797f0955e546e6dc7e9a1d5bb3a032cc3098d05146dc34102b37a0e1ff","0x3b9b6b975c03e793f51f80ed8c765da38242073577af7affdf49f3249fdfe050","0xeba0fbce18eb733197a38879f7c6e2a5d6621a794920f88639ecc0111a23b17c","0x6cd6d543135796555e1516bf7fe66144585a41b8466efe0298d667e2c4567c37","0x3f21d01e478c62ec83525aa3b488aef7f2525537c6a2d9bca679d6bf4d33a6ed","0xac73a866c288302a486c9e1963acf23b1db9f19a9e2b28d49cb4fa2df1e618f6","0xa5b130e9c36189db908a01555a3c2e8df1b37e87c1e1c5b4507dc6882ecd8a93","0xcd1ec91e4df9855bc08dd3217870a3e008ab80508bc5ef62e47ddf0b140e37d9","0x117912228d1bcac5a727964568e2836917afe87c925589b4f9f2b55d02867e8d","0xb264a3544f0f052883994f1c87aa9371bf0a030bc9e780584401cddf84b17528","0x86e709c8df61171e9c7b2efc1345d5b9d2dde2dc0045d75834e4aa7b7e1481b7","0x65fd697cadea691cb98748b65f13a0e4cceb0bc0981e6c5559acd91d27bde710","0xc2c559c4428d01d24eef2769f930f412f07418baa187157ccb340ff97a381c74","0xdf9072d8031cfef429f7a68df3deca848da6ffd05ec4b3db80f71c0390946ff6","0xee1108520d276bc16c5e47f5c3d42096dd475c7f6ec8a76e7f7b40cddea58184","0x0c3b2d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[wtdcode]

2 seems from here:

bsc/consensus/parlia/parlia.go

Line 78 in 847cef9

diffInTurn = big.NewInt(2) // Block difficulty for in-turn signatures

but I have no idea why mixHash is empty. Does bsc adopt EIP-4399 ??

[wtdcode]

Even EIP-3675 seems not landed, checked from releases.

[emailtovamos]

On BSC, the difficulty field is set to a constant value , mixHash is 0x0, and there is no actual PREVRANDAO opcode. This behavior is expected because BSC does not implement Proof of Work or EIP-4399. So the difficulty and mixHash fields have no real PoW meaning and are mainly placeholders.

[wtdcode]

On BSC, the difficulty field is set to a constant value , mixHash is 0x0, and there is no actual PREVRANDAO opcode. This behavior is expected because BSC does not implement Proof of Work or EIP-4399. So the difficulty and mixHash fields have no real PoW meaning and are mainly placeholders.

Hi, thanks for your response. Is it considered an official response?

Btw, I submitted a ticket with the same content to Discord and the ticket disappeared today. Is it the response to the ticket?