Unable to get block details for all block numbers.

[PrernaPadhee]

I an unable to get the block details for various block numbers. I want to understand what would be the first block for which block details would be present in the rosetta api. eg:

curl --location --request POST '10.213.67.9:7332/block'
--header 'Content-Type: application/json'
--data-raw '{ "network_identifier": { "blockchain": "Oasis", "network": "b11b369e0da5bb230b220127f5e7b242d385ef8c6f54906243f30af63c815535" }, "block_identifier": { "index": 1 } }'

response received:

{ "code": 12, "message": "unable to get block", "retriable": true }

Please elaborate on the oasis blockchain and block numbering

aLso oasis scan explorer shows the first block as 702004 (https://www.oasisscan.com/blocks)