Margriet Tindemans
type: MusicGroup
genre: chamber music
description: Margriet E. Tindemans (March 26, 1951 – December 31, 2014) was a musician, specializing in medieval music. The fourth child of Wilhelmina Coenen and Henricus Tindemans, Margriet demonstrated her musi
popularity: 13
followers: 46
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
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additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953695
additional property: OTSProofURL
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  value: https://artists.proofprofile.net/proofs/artist/72b3bfa0-fa6e-40cd-beae-43b668ecdee6.ots
additional property: OTSRecordURL
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSCanonicalRecord
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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
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeb727ef9024dffe2b88a9e19946433e8af445c05c259fab7576dc2bd425157f. Chain 2 (Bitcoin): anchored in block 953695 (2026-06-14T21:42:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/72b3bfa0-fa6e-40cd-beae-43b668ecdee6.json and https://artists.proofprofile.net/proofs/artist/72b3bfa0-fa6e-40cd-beae-43b668ecdee6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-14T21:42:01Z
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album: Jean-Fery Rebel - Sonatas pour le Violon & Suite in G
  type: MusicAlbum
  date published: 2012-09-06
album: Jacquet de la Guerre: Sonates pour le Viollon
  type: MusicAlbum
  date published: 2012-02-21