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+<pre>
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+ PIP: PIP-0042
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+ Title: Update OP_RECOVER to initial sense described on original WhitePaper and allow ASK FOR PASA feature
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+ Type: Protocol
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+ Impact: Hard-Fork
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+ Author: Albert Molina <[email protected]>
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+ Copyright: Albert Molina, 2021 (All Rights Reserved)
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+ Comments-URI: https://discord.gg/gamPX9E4RF (Discord channel #pip-42)
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+ Status: Proposed
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+ Created: 2021-09-23
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+</pre>
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+
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+## Summary
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+
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+Update current OP_RECOVER operation in order to have a similar sense as described on [Original PascalCoin WhitePaper published on July 2016][1] few weeks before Genesis Block.
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+
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+## Motivation
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+
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+OP_RECOVER feature was defined on original PascalCoin Whitepaper published on July 2016 as a way to allow recover coins that has lost private key.
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+
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+**PascalCoin WhitePaper:**
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+```
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+PascalCoin proposes an alternative to the basic operation of Bitcoin, through which change
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+several aspects for working on the new virtual currency:
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+...
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+ - PascalCoin provides a method set by protocol to retrieve coins that are not used
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+ instead (lost key). This method only applies if after a certain time the owner does not
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+ make any operation with the account private key.
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+...
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+(Page 2/8)
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+```
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+
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+Basically was a way to mantain a constant and predectible inflation and available coin because burning coins are not possible.
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+
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+Current problem is that WhitePaper definition is ambiguous and **certain time** was not specified, initial source code proposal was to **set a time value = 4 years** (420480 blocks in PascalCoin)
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+
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+Another problem is that WhitePaper didn't specified who can retrieve coins that are not used, neither what to do with Pascal Accounts (aka **PASA**) not used.
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+
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+## Proposal
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+
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+This PIP specifies a more accurated OP_RECOVER feature that will mantain initial sense and will allow a fair PASA and coins distribution.
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+
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+Update current OP_RECOVER to work as this:
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+
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+1. The way to know if an Account is not used will be counting how many blocks since last private key signed this Account as an Active mode as defined on [PIP-0037][2].
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+
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+2. Accounts without coins (amount = 0) can be reused to community usage in a ASK FOR PASA (OP_RECOVER special case) after 4 years if Account has not been used as specified on 1.
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+
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+3. Coins stored in Accounts (where amount > 0) can be retrieved to MINER that generates a block as a fee in the OP_RECOVER operation after 10 years if Account has not been used as specified on 1.
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+
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+4. ASK FOR PASA will be an OP_RECOVER special case operation signed by an Authority Account, Authority Account will be the Account stored in the type value of Account number 1 ( Account(1).type == Authority Account ).
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+
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+5. Accounts 0 to 9 (inclusive) are exempt for OP_RECOVER operation.
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+
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+
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+## Specification
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+
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+The following changes are required to implement this in PascalCoin.
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+
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+### New OP_RECOVER fields
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+
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+A new field `sign` will be added to OP_RECOVER that will be used in Proposal number 2. Value MUST be empty in other cases.
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+
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+```
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+ TOpRecoverFoundsData = Record
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+ account: Cardinal;
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+ n_operation : Cardinal;
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+ fee: UInt64;
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+ new_publicKey: TAccountKey;
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+ // New field for PIP-0042
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+ sign: TECDSA_SIG;
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+ End;
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+```
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+
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+### Update OP_RECOVER code
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+
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+#### Changes on check
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+
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+Check proposals 2 to 5:
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+
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+```
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+ let A = target PASA
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+ let L4Years = 420480 ((24 hours * 60 minutes) DIV 5 minutes) * 365 days * 4 years)
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+ let L10Years = 1051200 ((24 hours * 60 minutes) DIV 5 minutes) * 365 days * 10 years)
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+ let LCurrentBlock = Current Blockchain new block number
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+
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+ // Proposal 5 protection
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+ if (A.account<=9) then
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+ Error 'Accounts 0..9 are protected';
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+
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+ // Proposal 2 protection
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+ if (A.updated_on_block_active_mode + L4Years >= LCurrentBlock) then
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+ Error 'Account is still active (less than 4 years without private key usage)';
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+
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+ // Proposal 3 protection
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+ if (A.updated_on_block_active_mode + L10Years >= LCurrentBlock) AND (A.Balance > 0) then
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+ Error 'Account has balance>0 and still active (less than 10 years without private key usage)';
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+
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+ let B = Account(1)
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+ let C = Account( B.type ) // Authority account
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+ let DATA = OP_RECOVER fields
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+
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+ // Proposal 4 ASK FOR PASA signed by Authority account
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+ if ((DATA.new_publicKey) not null) AND (NOT IsValidSignature(DATA.sign, C.accountInfo.publicKey)) then
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+ Error 'Ask for Pasa feature must be signed by Authority account';
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+
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+```
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+
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+#### Changes on Execute
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+
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+Execution is done only **after checks are passed**
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+
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+```
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+ // Assume same fields than check code
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+
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+ // Ask for Pasa
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+ if ((DATA.new_publicKey) not null) then
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+ set A.accountInfo.publicKey = DATA.new_publicKey
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+
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+ set FEE = A.balance
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+ set A.balance = 0; // Sets Account balance to 0, balance will be a fee for the miner
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+
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+ SaveAccount( A );
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+
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+ // Only the miner will obtain coins as a Fee of the block, none other can retrieve coins
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+ IncrementNewBlockFee( FEE );
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+
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+```
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+
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+### Conclusion
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+
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+Only miner can retrieve coins, this will help and add a miners and pools race
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+
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+Current holders will have a reasonable time period (10 years) to hold coins
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+
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+Ask for Pasa feature will be available since activation thanks to 4 years rule
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+
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+## Affected PIP's
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+
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+This PIP deactivates PIP-0012 and PIP-0019
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+
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+## Backwards Compatibility
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+
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+This change is not backwards compatible and requires a hard-fork activation.
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+
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+## Links
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+
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+1. [Original PascalCoin WhitePaper published on July 2016. Accessed 2021-09.][1]
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+2. [PIP-0037][2]
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+
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+[1]: https://github.com/PascalCoin/PascalCoin/blob/c22184dd7a407c6646ab651494822071726ed36e/PascalCoin%20White%20Paper%20-%20EN.pdf
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+[2]: https://github.com/PascalCoin/PascalCoin/blob/master/PIP/PIP-0037.md
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PascalCoin