use-pink-extension.md

Use Pink Extension

Introduction

All the unique capabilities of Phat Contract are implemented in pink-extension. Informally speaking:

$$ Phat\ Contract = ink! + Pink\ Extension $$

It is worth noting that the Phat Contract is not a trivial extension of ink! contract since all these extra functions only work under the off-chain computation.

Pink Extension Functions

Functionality	Function Name	Query Support	Transaction Support
Internet Access	http_request	✅	❌
Crypto	getrandom	✅	❌
	ecdsa_sign_prehashed	✅	✅
	ecdsa_verify_prehashed	✅	✅
	sign (ecdsa/ed25519)	✅	✅
	sign (sr25519)	✅	❌
	verify	✅	✅
	derive_sr25519_key	✅	✅
	get_public_key	✅	✅
Volatile Cache	cache_set	✅	✅
	cache_set_expire	✅	✅
	cache_get	✅	❌
	cache_remove	✅	✅
Misc	log	✅	✅
	is_running_in_command	✅	✅

Refer to our Phat Hello World contract to see how you can import these functions to your contract.