Clara De Vries
type: MusicGroup
description: Clara Johanna Suzanna de Vries (31 December 1915 – 22 October 1942) was a Dutch jazz trumpeter and bandleader. She was murdered by Nazis at Auschwitz Birkenau during World War II. Family De Vries w
popularity: 9
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x138cdfbd50d966f63df0fe3acee5c8c57c1aab1e65568bf46213033465f1d100
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/9d70ea26-db5d-45f2-86fd-abdc2103a6c9.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/9d70ea26-db5d-45f2-86fd-abdc2103a6c9.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/9d70ea26-db5d-45f2-86fd-abdc2103a6c9
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T06:31:18Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x138cdfbd50d966f63df0fe3acee5c8c57c1aab1e65568bf46213033465f1d100","name":"Clara De Vries","registered_at":"2026-06-20T04:35:26Z","symbol":"NIM1513087","token_address":"0x11908297c17cdb94031a59eee1b6d93e50545492","type":"artist","uuid":"9d70ea26-db5d-45f2-86fd-abdc2103a6c9"}
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 0x138cdfbd50d966f63df0fe3acee5c8c57c1aab1e65568bf46213033465f1d100. 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/9d70ea26-db5d-45f2-86fd-abdc2103a6c9.json and https://artists.proofprofile.net/proofs/artist/9d70ea26-db5d-45f2-86fd-abdc2103a6c9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T06:31:18Z
  text: {"copyright_id":"0x138cdfbd50d966f63df0fe3acee5c8c57c1aab1e65568bf46213033465f1d100","name":"Clara De Vries","registered_at":"2026-06-20T04:35:26Z","symbol":"NIM1513087","token_address":"0x11908297c17cdb94031a59eee1b6d93e50545492","type":"artist","uuid":"9d70ea26-db5d-45f2-86fd-abdc2103a6c9"}
album: Calculate
  type: MusicAlbum
  date published: 2025-08-08