Black Mass
type: MusicGroup
genre: speed metal
genre: thrash metal
description: thumb|300x300px|The Guibourg Mass by Henry de Malvost, from the book by Jules Bois, Paris, 1903 A Black Mass is a ceremony celebrated by various Satanic groups. It has allegedly existed for centuries
popularity: 4
followers: 3047
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x2c73c2c671bdd6f49548395d5e926be3ddb608b6f2e73733bd1dc16b8fa02f0b
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953997
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953997
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/24a969f1-b6cf-477d-a459-e89e6d7bfc15.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/24a969f1-b6cf-477d-a459-e89e6d7bfc15.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/24a969f1-b6cf-477d-a459-e89e6d7bfc15
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T20:07:57Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x2c73c2c671bdd6f49548395d5e926be3ddb608b6f2e73733bd1dc16b8fa02f0b","name":"Black Mass","registered_at":"2026-06-16T02:12:46Z","symbol":"NIM0905076","token_address":"0xccae9328c6eeb72a5929d67c7d457932c19c153a","type":"artist","uuid":"24a969f1-b6cf-477d-a459-e89e6d7bfc15"}
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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c73c2c671bdd6f49548395d5e926be3ddb608b6f2e73733bd1dc16b8fa02f0b. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/24a969f1-b6cf-477d-a459-e89e6d7bfc15.json and https://artists.proofprofile.net/proofs/artist/24a969f1-b6cf-477d-a459-e89e6d7bfc15.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T20:07:57Z
  text: {"copyright_id":"0x2c73c2c671bdd6f49548395d5e926be3ddb608b6f2e73733bd1dc16b8fa02f0b","name":"Black Mass","registered_at":"2026-06-16T02:12:46Z","symbol":"NIM0905076","token_address":"0xccae9328c6eeb72a5929d67c7d457932c19c153a","type":"artist","uuid":"24a969f1-b6cf-477d-a459-e89e6d7bfc15"}
album: Black Mass
  type: MusicAlbum
  date published: 2015-08-15
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