Using filters for storage and retrieval deals
Storage providers might demand very precise and dynamic control over a combination of deal parameters.
Boost, similarly to Lotus, provides two IPC hooks allowing you to name a command to execute for every deal before the storage provider accepts it:
  • Filter for storage deals.
  • RetrievalFilter for retrieval deals.
The executed command receives a JSON representation of the deal parameters, as well as the current state of the sealing pipeline, on standard input, and upon completion, its exit code is interpreted as:
  • 0: success, proceed with the deal.
  • non-0: failure, reject the deal.
The most trivial filter rejecting any retrieval deal would be something like: RetrievalFilter = "/bin/false". /bin/false is binary that immediately exits with a code of 1.
This Perl script lets the miner deny specific clients and only accept deals that are set to start relatively soon.
You can also use a third party content policy framework like bitscreen by Murmuration Labs, or CID gravity:
# grab filter program
go get -u -v
# add it to both filters
Filter = "/path/to/go/bin/bitscreen"
RetrievalFilter = "/path/to/go/bin/bitscreen"
Here is a sample JSON representation of the input sent to the deal filter:
"DealParams": {
"DealUUID": "48c31c8c-dcc8-4372-a0ac-b5468eea555b",
"IsOffline": false,
"ClientDealProposal": {
"Proposal": {
"PieceCID": {
"/": "baga6ea4seaqh5prrl6ykov4t64k6m6giijsc44dcxtdnzsp4izjakqhs7twauiq"
"PieceSize": 2147483648,
"VerifiedDeal": false,
"Client": "f1sw5zjcyo4mff5cbvgsgmm7uoko6gcr4tptvtkhy",
"Provider": "f0127896",
"Label": "bafyaa7qsgafcmalqudsaeidrunclaep6mdbipm2gjfvuosjfd6cbqd6th7bshy5hi5npxe727yjaagelucbyabasgafcmalqudsaeieapsxspo2i36no36n7yitswsxdazvziwvgj4vbp2scuxasrc6n4ejaage3r7m3saykcqeaegeavdllsbzaqcaibaaeecakrvvzam",
"StartEpoch": 1717840,
"EndEpoch": 2236240,
"StoragePricePerEpoch": "1",
"ProviderCollateral": "363196619502649",
"ClientCollateral": "0"
"ClientSignature": {
"Type": 1,
"Data": "SmgcBnQE+0ZIb4zAXw7TpxLliSaliShEvX9P4+uwvxBhRDlJD+F6N3NFoNrA2y5bTeWF5aWWuL93w+SSmXFkoAA="
"DealDataRoot": {
"/": "bafyaa7qsgafcmalqudsaeidrunclaep6mdbipm2gjfvuosjfd6cbqd6th7bshy5hi5npxe727yjaagelucbyabasgafcmalqudsaeieapsxspo2i36no36n7yitswsxdazvziwvgj4vbp2scuxasrc6n4ejaage3r7m3saykcqeaegeavdllsbzaqcaibaaeecakrvvzam"
"Transfer": {
"Type": "http",
"ClientID": "",
"Params": "eyJVUkwiOiJodHRwczovL2FudG8uLXB1YmxpYy1idWNrZXQtYm9vc3QuczMuZXUtY2VudHJhbC0xLmFtYXpvbmF3cy5jb20vcmFuZGZpbGVfMkdCXzAuY2FyIiwiSGVhZGVycyI6bnVsbH0=",
"Size": 2000177948
"SealingPipelineState": {
"SectorStates": {
"Available": 684,
"Proving": 307,
"Removed": 82,
"TerminateFailed": 1,
"TerminateWait": 5
"Workers": null
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