Black Mask
type: MusicGroup
genre: heavy metal
genre: speed metal
description: Black Mask may refer to: Film Black Mask (1935 film), a British crime film directed by Ralph Ince The Black Mask (1952 film), an Italian historical adventure film Black Mask (1996 film), a movie
popularity: 3
followers: 995
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x3e745d1bcf0eb216de9a2df2f5d5f41a91db4a9a579ffce6e2af1abd3962deac
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954693
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954693
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/e8aee812-4d39-4663-88bb-ed64d52a904e.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/e8aee812-4d39-4663-88bb-ed64d52a904e.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/e8aee812-4d39-4663-88bb-ed64d52a904e
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T11:50:32Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x3e745d1bcf0eb216de9a2df2f5d5f41a91db4a9a579ffce6e2af1abd3962deac","name":"Black Mask","registered_at":"2026-06-21T09:29:53Z","symbol":"NIM1889282","token_address":"0x4cbb30af4b5094535739c07d9e554f76c5eaca0d","type":"artist","uuid":"e8aee812-4d39-4663-88bb-ed64d52a904e"}
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e745d1bcf0eb216de9a2df2f5d5f41a91db4a9a579ffce6e2af1abd3962deac. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e8aee812-4d39-4663-88bb-ed64d52a904e.json and https://artists.proofprofile.net/proofs/artist/e8aee812-4d39-4663-88bb-ed64d52a904e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T11:50:32Z
  text: {"copyright_id":"0x3e745d1bcf0eb216de9a2df2f5d5f41a91db4a9a579ffce6e2af1abd3962deac","name":"Black Mask","registered_at":"2026-06-21T09:29:53Z","symbol":"NIM1889282","token_address":"0x4cbb30af4b5094535739c07d9e554f76c5eaca0d","type":"artist","uuid":"e8aee812-4d39-4663-88bb-ed64d52a904e"}
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  type: MusicAlbum
  date published: 2020-12-04
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