eth_newFilter

Creates an arbitrary filter object, based on filter options,
to notify when the state changes (logs).

To check if the state has changed, call eth_getFilterChanges.

note

Filters expire after 5 minutes of inactivity (no queries).

Note on specifying topic filters

• [] “anything”
• [A] “A in first position (and anything after)”
• [null, B] “anything in first position AND B in second position (and anything after)”
• [A, B] “A in first position AND B in second position (and anything after)”
• [[A, B], [A, B]] “(A OR B) in first position AND (A OR B) in second position (and anything after)”

Parameters

• Object - An object of type Filter
  • fromBlock: QUANTITY|TAG - (optional, default "latest") Integer block number,
    or "earliest", "latest" or "pending" for not yet mined transactions
  • toBlock: QUANTITY|TAG - (optional, default "latest") Integer block number,
    or "earliest", "latest" or "pending" for not yet mined transactions
  • address: DATA|Array of DATA, 20 Bytes - (optional) Contract address or a list of addresses
    from which logs should originate
  • topics: Array of DATA, - (optional) Array of 32 Bytes DATA topics. Topics are order-dependent.
    Each topic can also be an array of DATA with "or" options

Returns

• QUANTITY - A filter id