data-registry-costings

Baseline costings for writing raw data to chain.

All data is writen to a simple mapping data structure using a key value store where the key ios bytes32 and the value is a variable type depending on the test.

See ./contracts/DataRegistry.sol for the actual smart contract tested. See ./test/operational-costs.test.js for the test script to which generates the below outcome.

Results (single write)

• All tests at GAS price 10 (gwei)
• Gas usage worked out with a price of $210 per ETH

Strings

Length	Gas Used	Costs ($)
20	437060000000000	$0.0917826
40	842470000000000	$0.1769187
100	1253750000000000	$0.2632875
200	1871690000000000	$0.39305490000000004

Bytes

Length	Gas Used	Costs ($)
20	435580000000000	$0.09147179999999999
40	840990000000000	$0.1766079
100	1252270000000000	$0.2629767
200	1870210000000000	$0.3927441

uint256 (Unsigned 256 bit integers)

• 10 digital number used 419040000000000 GAS at an approximate cost of $0.0879984

Results (overrides)

• Same costing model as above

• Data overwritten using the same key which will reduce the storage slot initialisation costs

Strings

type	Length	Gas Used	Costs ($)
initial write	100	1253750000000000	$0.2632875
update	100	461750000000000	$0.0969675

Bytes

type	Length	Gas Used	Costs ($)
initial write	100	1252270000000000	$0.2629767
update	100	460270000000000	$0.0966567

uint256

type	Length	Gas Used	Costs ($)
initial write	10 digits	419040000000000	$0.0879984
update	10 digits	227040000000000	$0.047678399999999996