Confirm deposit script `pospubkey` params and validation

[Rygoatei]

I noticed that the validation buffer length for the pospubkey provided by others is 33 (hex is 66). The example code I was given uses a posaddress with a 42-byte address length. I need to confirm parameter validation and the correct parameter values for deposit script.

Reference:

btc-script-factory/src/covenantV1/bridge.script.ts

Lines 18 to 20 in 8c169ae

	if (posPubkey.length !== PK_LENGTH) {
	throw new Error("Invalid public key length");
	}