Marc & Katt
type: MusicGroup
popularity: 12
followers: 53
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x32a7974f89a8d564a23172388c26e0c9ccc57a019ef28cd4a5e2ff3aa6ff8d70
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953772
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953772
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/c7f29461-b662-4a6a-947c-28c4de939b15.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/c7f29461-b662-4a6a-947c-28c4de939b15.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/c7f29461-b662-4a6a-947c-28c4de939b15
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T10:33:29Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x32a7974f89a8d564a23172388c26e0c9ccc57a019ef28cd4a5e2ff3aa6ff8d70","name":"Marc & Katt","registered_at":"2026-06-15T01:28:06Z","symbol":"NIM0639047","token_address":"0x2e44c5ddd32b0c16f5ae5de91f148f377b4449d5","type":"artist","uuid":"c7f29461-b662-4a6a-947c-28c4de939b15"}
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 0x32a7974f89a8d564a23172388c26e0c9ccc57a019ef28cd4a5e2ff3aa6ff8d70. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c7f29461-b662-4a6a-947c-28c4de939b15.json and https://artists.proofprofile.net/proofs/artist/c7f29461-b662-4a6a-947c-28c4de939b15.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
  date published: 2026-06-15T10:33:29Z
  text: {"copyright_id":"0x32a7974f89a8d564a23172388c26e0c9ccc57a019ef28cd4a5e2ff3aa6ff8d70","name":"Marc & Katt","registered_at":"2026-06-15T01:28:06Z","symbol":"NIM0639047","token_address":"0x2e44c5ddd32b0c16f5ae5de91f148f377b4449d5","type":"artist","uuid":"c7f29461-b662-4a6a-947c-28c4de939b15"}
album: Broccoli Dance
  type: MusicAlbum
  date published: 2024-09-13
album: Creepy Crawly Things
  type: MusicAlbum
  date published: 2024-10-24
album: Monkey On My Bed
  type: MusicAlbum
  date published: 2025-06-27
album: Find in the Garden
  type: MusicAlbum
  date published: 2025-10-17
album: Little Christmas Star
  type: MusicAlbum
  date published: 2025-11-07