Precompiled Contracts

SKALE Chains ship extra precompiled contracts beyond Ethereum’s defaults (e.g., ecrecover, sha256, modexp). These precompiles unlock native file storage, logging, randomness, and configuration helpers without deploying custom contracts—ideal for builders who want performance and simplicity.

Address	Function	Sender Who May Call	Description
0x0A	readChunk	Any	Reads chunk from file from specific position with specific length
0x0B	createFile	Filestorage Only	Creates an address for an empty file
0x0C	uploadChunk	Filestorage Only	Uploads 1MB chunk of data from specific position in specific file by file owner
0x0D	getFileSize	Any	Returns size of file
0x0E	deleteFile	Filestorage Only	Deletes file from filestorage system
0x0F	createDirectory	Filestorage Only	Creates directory in filestorage system
0x10	deleteDirectory	Filestorage Only	Deletes directory in filestorage system
0x11	calculateFileHash	Any	Calculates and writes SHA256 hash of file in same directory <NAME_OF_FILE>._hash
0x12	logTextMessage	Any	Logs a message: 0 - Normal 1 - Debug 2 - Trace 3 - Warning 4 - Error 5 - Fatal Used for IMA SKALE Chain Testing
0x13	getConfigVariableUint256	Any	Returns SKALE Chain config uint256 for IMA SKALE Chain contracts. Used for reading BLS common public key
0x14	getConfigVariableAddress	Any	Returns SKALE Chain config address for IMA SKALE Chain testing
0x15	getConfigVariableString	Any	Returns SKALE Chain config string for IMA SKALE Chain testing
0x16	fnReserved0x16	Any	Reserved
0x16	getConfigPermissionsFlag	Any	Returns SKALE Chain config boolean for IMA SKALE Chain testing
0x18	getBlockRandom	Any	Return a random number based on BLS threshold signature common coin of the current block
0x19	getIMABLSPublicKey	Any	Returns relevant BLSPublicKey according to block timestamp

Use these precompiles to build richer experiences (randomness for gaming, native storage for media, config reads for bridges) without extra gas costs or custom infra.

SKALE Chain

Chain Types

Run a SKALE Chain