SKALE Chain Precompiled Contracts

Each SKALE Chain comes with a set of precompiled contracts in addition to the precompiled contracts included with Ethereum (i.e. ecrecover, sha256, modexp, …​).

Table 1. SKALE Chain Precompiled Contracts
Address Function Description Sender who can call

0x0A

readChunk

Reads chunk from file from specific position with specific length.

Any

0x0B

createFile

Creates an address for an empty file.

Filestorage only

0x0C

uploadChunk

Uploads 1MB chunk of data from specific position in specific file by file owner.

Filestorage only

0x0D

getFileSize

Returns size of file.

Any

0x0E

deleteFile

Deletes file from filestorage system.

Filestorage only

0x0F

createDirectory

Creates directory in filestorage system.

Filestorage only

0x10

deleteDirectory

Deletes directory in filestorage system.

Filestorage only

0x11

calculateFileHash

Calculates and writes SHA256 hash of file in same directory <NAME_OF_FILE>._hash

Filestorage only

0x12

logTextMessage

Logs a message:

  • 0 - Normal

  • 1 - Debug

  • 2 - Trace

  • 3 - Warning

  • 4 - Error

  • 5 - Fatal

Used for IMA SKALE Chain testing.

Any

0x13

getConfigVariableUint256

Returns SKALE Chain config uint256 for IMA SKALE Chain contracts. Used for reading BLS common public key.

Any

0x14

getConfigVariableAddress

Returns SKALE Chain config address for IMA SKALE Chain testing.

Any

0x15

getConfigVariableString

Returns SKALE Chain config string for IMA SKALE Chain testing.

Any

0x16

fnReserved0x16

Reserved.

Any

0x17

getConfigPermissionsFlag

Returns SKALE Chain config boolean for IMA SKALE Chain testing.

Any

0x18

getBlockRandom

Return a random number based on BLS threshold signature common coin of the current block.

Any

0x19

getIMABLSPublicKey

Returns relevant BLSPublicKey according to block timestamp.

Any
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