Infura is unreliable during large Ropsten reorgs

[MaksymZavershynskyi]

I have observed that when Ropsten undergoes large re-orgs (~500 blocks) Infura start returning data before the re-org instead of returning new data for at least 15 minutes (but I suspect from old logs that it can be outdated for much longer). Specifically, when I tried to identify what is the hash of 8574767 Infura disagreed with etherscan, and it seems like etherscan is the right one.

Here etherscan:

And here is raw request to Infura with response ( 0x82d72f is hex for 8574767):

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getBlockByNumber","params":["0x82d72f", false],"id":1}' https://ropsten.infura.io/v3/<infura_project_id>
{"jsonrpc":"2.0","id":1,"result":{"difficulty":"0xbe6f7e6","extraData":"0xd88301090c846765746888676f312e31332e38856c696e7578","gasLimit":"0x7a1200","gasUsed":"0x797ff0","hash":"0x9d6714e1d19dd1991b70964a2ae58127e6a7a9e6bd268c381bc7fa491b150c45","logsBloom":"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","miner":"0x773b556e7f3222f3b93d6519484cef0c443b9d7e","mixHash":"0x6ed1b18268bc96ce53943aa1f808e523d1c662fa2423e2e2db8f679f02969900","nonce":"0x43342018adee7310","number":"0x82d72f","parentHash":"0x21b3f6c00344e72dc2fdc77b1cbf9c38e44896fb8da2c4e425ac8b7b879dd732","receiptsRoot":"0xa81856b29410971d136cffed331e33a43cc7a12c9640d37d60cd4adfda60cd86","sha3Uncles":"0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347","size":"0x65c7","stateRoot":"0x4020224aa7b0f848bdeaa9a151cdb3fe94b411f35daab03dd0338320e3660010","timestamp":"0x5f49c417","totalDifficulty":"0x6f9733138d44ef","transactions":["0x7fab69ba36c8e4af74e8439820143199a4f8161aab5d28bbff6b2fd94b2ea111","0x387b09759af8b262edc4b842d3803a1c646bf300ffe1adfe9296ee548f6b3a3d","0xf6f601c7cd9588bfc2815deb288bcef736520a63729640cff5da6cf433d3660e","0x8595a5e67337c36f9663356d2f3b3e333a5f810f424be6a8580db8942137a40b","0x022c485987391fe9875aa04700fd4fe714365f5b33e4a3804607504ac6a5edce","0x6bd3a0849c9a4a9a2822f078a98bb784514901a95b29ec79afefeed5f68a480d","0xb98fa57ca8d94511858ab1f546cb0d77ec2f8dd9c1eaf35546c1fc4905afe014","0x5c6a1b3299576e12823608b04b20d82b1bc8c474e772cf8e303212b30c51dc31","0xedbc4bed72e799435d812510b27578aef9e9e8896503b7783f414306eeb9da11","0xa90a93eeef9257a94332792902cb6b79965e3984c2a10195d8df5f3c3e64ea68","0x10fa8228b4ec7c2c840a956e7c190ef956bcfa6fbd66b7ba94306df47579e9ad","0x4913c0820296fadbd05cd56c5e205bb676da62a6db31ece89fe56c8405213b1f","0xf10c032f4b25c8e0cf62ffffcf847410a7879087ad5c1bd4b989d43067ea914a","0x07b4f7bb299222f01179603eb91a9fdfe7395b14fc75da76b118882c88078f1d","0x9a52f965e226cd50d606095e83f5344d44cc8dd979f7403afcf3ef992d16ab76","0x4b173ef2c3bd21667ae052b9bc24ef2f493e92c0013541526ba33eb301f5a139","0xf0d62a332018bea4e5b34799570a1b34a82280049e2ac9dcef9fefb6dac881a2","0xfc6898b50b281b849b99e5bb151851209720baf8c46623783fb91f269ef38e85","0x5f24258afe7f94dfa321cfc6da53d4b9d54a5365ee2ad91432ee3d6719927fb7","0x7e498c015c027070983acdb4874499aa26d418210accdd35cd925a66e4638609","0xe6baeeb87f1cdee528ee80e8c919bac9210140f46b373393719247207b4ccca0","0x7ef6acc707efa8958335ea20803b50a312a48146a37d00102bbf41340afa1ae2","0x35ae10eda9596d64316bca64f9b64b8fa68e6a66bb244d4b84301f44ce40587f","0xd09c5b5ddcc9c545575a1ebb215409abc1dd6a53cb6a77395b1ce8f53bf7970d","0x050eefafe97b2d1481f8567775595bdf573f007d81b77a39a6ffdb60316187ff","0xdde7935503387dd9cf0a06413ce4976b5f11ea479c639f5b513061f6a9dd6035","0x0db88e7af756a5ffdd3aced54064c7c1fb4661fe092a62df51672e8a0e65ebca","0x60b149e05c021a48af9b3436a1386928d6c5ba8ce137f79f42c091addd9555e4","0x21fae6714509971f17a9797306e50832c910b1bd901f339ee44fa39fab80635a","0xa872de4c5084d20549e248cf7ba352e5ec9a32cb477f95bd2e2a4f45a6ea4dc5","0xe408b6431b1a21fbb572947d58e111aa32a60244bc0870544a751573a6ab30bc","0x1ded5f56b008bf385dd79a60c4a0482c868a00af524c9d553483f57cde7e25ba","0xc21a123e3e252c0fa23e68c242e69ed723c06f5b314ef5175d92293cafac9d93","0xed22619ad4e0f3944ad84894705319999e599a8f533d3b8110ad61b85d064a1d","0x1b828d5ccf173f399120e2bd5d56991bd8216cb48d5ae193dc07c912b23ed33d","0x6f7398246dcdd7d337a7dae53d641440adec113101129ec4d78f83c3f535df28","0x3d5cbc3fcd49e87eb211d309524026e00d151bd7cda4a79d4a0f434b6626ff0f","0x2b63fc75029201cd630c4c777758054d33c67aec91c35847262e93f2687d2f9b","0xc3bfe72851972e049a136a4f0eed739692b34e13dc5c0d45a95b1fb999d8d316","0xf5a4b872ed03a166f3527da54960bacdd8ff7e1338490be135d72d40749e5df0","0x0f2334d728e0bdb4390d21c600cc473ceafcc0ad7545a542f75951e9fd807d9b","0x7e7fc93a18ae937bdcd8f3f484e1b00412166e6fcbf0e5643aa9b5f5e7ec0a0d","0x0ee3edcc5ac92538cb440b3ac1965f6a38606a7845c1e38624825b5eb3f46816","0xa97a6b03e3d46bf4bffed9210041f56ddf7b4b3c9cab003b45f51ed995608a40","0x376628ecebc6e9c3b620a94a3a4a86fcaa99fb26d904231490de763037f27848","0x847dd3fcf2ee3972fe89322eb9ce09045c111375cb1a1f4744ab558d594b62b7","0xe4045e7fcfddff538c9e8dd0add6b5b2e9493ca98dcb9b81818ef6a847c379d8","0xedf3f168d28a6157a4803d62836e4941dcd87918c6a4905d8f92fa8459a8b8e2","0x1df8599961b2317ba968667bbab9d369c2e8fa865da9dc99acd40221e3d1f19d","0x948643ef14a34285d9046a10e51ae90da9455f247ada71dd2a16f5b511f906f5","0xa702eee62ef9e3dc0bd83301bccfcee6d27606583f21dffda565d6a0b846fb2d","0x641f453dd057bdc3278c860d611a3b46c7a060089ad23610aa6af6289c914bc1","0x326fe161c6c2c579c91d0f300a158e5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

Notice that infura returns 0x9d6714e1d19dd1991b70964a2ae58127e6a7a9e6bd268c381bc7fa491b150c45 (old incorrect hash, before the re-org) hash while etherscan returns 0xd08676d6d8a6de29a5a6c8c9c264160e3210b7b69284aa0ed46380db7c15d089 (correct hash after re-org).

Conclusion

We cannot run bridge on Ropsten testnet and use infura. We either need to not run our bridge on Testnet at all, or we need to have our own node synced with Ethereum Ropsten at all times. I suggest the latter.