Marcel Cellier
type: MusicGroup
description: Marcel Cellier (29 October 1925 – 13 December 2013) was a Swiss organist, ethnomusicologist and music producer, internationally known for introducing the singing of Le Mystère des Voix Bulgares, and t
popularity: 7
followers: 175
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xfd71d57917c658b4f112ae05cc146148183cc648bca48c0353f4863286fc510b
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954513
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954513
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/9e57c9c9-df28-4237-a247-25b29d24cf8f.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/9e57c9c9-df28-4237-a247-25b29d24cf8f.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/9e57c9c9-df28-4237-a247-25b29d24cf8f
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T06:31:18Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xfd71d57917c658b4f112ae05cc146148183cc648bca48c0353f4863286fc510b","name":"Marcel Cellier","registered_at":"2026-06-20T04:52:14Z","symbol":"NIM1517692","token_address":"0xe02199cb282ebc0e67eeaf6e7aabfaf86ee39aac","type":"artist","uuid":"9e57c9c9-df28-4237-a247-25b29d24cf8f"}
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 0xfd71d57917c658b4f112ae05cc146148183cc648bca48c0353f4863286fc510b. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9e57c9c9-df28-4237-a247-25b29d24cf8f.json and https://artists.proofprofile.net/proofs/artist/9e57c9c9-df28-4237-a247-25b29d24cf8f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T06:31:18Z
  text: {"copyright_id":"0xfd71d57917c658b4f112ae05cc146148183cc648bca48c0353f4863286fc510b","name":"Marcel Cellier","registered_at":"2026-06-20T04:52:14Z","symbol":"NIM1517692","token_address":"0xe02199cb282ebc0e67eeaf6e7aabfaf86ee39aac","type":"artist","uuid":"9e57c9c9-df28-4237-a247-25b29d24cf8f"}