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QUANTITY - A filter id.
// Request curl https://arbitrum.blockpi.network/v1/rpc/your-rpc-key -X POST -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"eth_newBlockFilter","params":[],"id":1}' // Result { "jsonrpc": "2.0", "id": 1, "result": "0xd4df0a04ea4f51817369790e3db5d08e" }
Creates a filter in the node, to notify when a new block arrives. To check if the state has changed, call eth_getFilterChanges.