All V1 sealed proof sector expansion to 540 days

FIPS/fip-0014.md

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+---
+fip: "0014"
+title: V1 seal proof sectors extension
+author: deltazxm (@deltazxm), Neo Ge(@neogeweb3)
+discussions-to: https://github.com/filecoin-project/FIPs/issues/56
+status: Draft
+type: Technical
+created: 2021-26-02
+spec-sections: 
+  - section-systems.filecoin_mining.sector.lifecycle
+
+---
+
+## Simple Summary
+Allow the life cycle of V1 proof sectors to be able to extend.
+Allow the V1 proof sectors life cycle extention. 
+
+## Abstract
+All the V1 proof sectors are sealed with collaterals and gas fees, but they have not received the same treatment as other sectors. The security issue of V1 proof sectors are not enough to threaten the chain security. So this proposal allows the V1 proof sectors lifecycle to be extended. 
+
+## Change Motivation
+In the case of network security, the fairness of the decentralized network needs to be guaranteed. Miners with V1 proof sectors have also gone through the strict sealing process, and have paid the collaterals and gas. The V1 proof sectors lifecycle should be allowed to extended without affecting the chain security. 
+Although the V1 sectors have some security vulnerabilities, these security factors are not enough to constitute a reason for not allowing extensions. This is not a vulnerability that threatens the security of the chain, so extension should be allowed. 
+
+### Actor changes
+var ExtensibleProofTypesV7 = map[abi.RegisteredSealProof]struct{}{ 
+        abi.RegisteredSealProof_StackedDrg32GiBV1:   {}, 
+        abi.RegisteredSealProof_StackedDrg64GiBV1:   {}, 
+        abi.RegisteredSealProof_StackedDrg32GiBV1_1: {}, 
+        abi.RegisteredSealProof_StackedDrg64GiBV1_1: {}, 
+}
+
+## Test Cases
+N/A
+
+## Implementation
+The changes to the miner actor are in: https://github.com/filecoin-project/specs-actors/pull/1310
+
+## Security Considerations
+N/A
+
+## Incentive Considerations
+After making this change, V1 proof sectors lifecycle will be extended and continue to receive block rewards. 
+## Product Considerations
+N/A
+
+## Copyright
+
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).