Circa 1500 dir. Nancy Hadden
type: MusicGroup
genre: medieval
popularity: 2
followers: 13
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x0d5d2f9f1e2ced9bd3b2f88cfc30af98d4bb7bc017cdb97b7227c4bc3d8e581b
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954667
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954667
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/d5982ea7-d979-4d2c-951b-6526fd228141.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/d5982ea7-d979-4d2c-951b-6526fd228141.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/d5982ea7-d979-4d2c-951b-6526fd228141
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T07:29:20Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x0d5d2f9f1e2ced9bd3b2f88cfc30af98d4bb7bc017cdb97b7227c4bc3d8e581b","name":"Circa 1500 dir. Nancy Hadden","registered_at":"2026-06-21T02:38:48Z","symbol":"NIM1794227","token_address":"0x56c41d1befe3b43799f4eead4ef41abfff8cd201","type":"artist","uuid":"d5982ea7-d979-4d2c-951b-6526fd228141"}
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 0x0d5d2f9f1e2ced9bd3b2f88cfc30af98d4bb7bc017cdb97b7227c4bc3d8e581b. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d5982ea7-d979-4d2c-951b-6526fd228141.json and https://artists.proofprofile.net/proofs/artist/d5982ea7-d979-4d2c-951b-6526fd228141.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T07:29:20Z
  text: {"copyright_id":"0x0d5d2f9f1e2ced9bd3b2f88cfc30af98d4bb7bc017cdb97b7227c4bc3d8e581b","name":"Circa 1500 dir. Nancy Hadden","registered_at":"2026-06-21T02:38:48Z","symbol":"NIM1794227","token_address":"0x56c41d1befe3b43799f4eead4ef41abfff8cd201","type":"artist","uuid":"d5982ea7-d979-4d2c-951b-6526fd228141"}
album: Sacred Concerti
  type: MusicAlbum
  date published: 2009-02-18