Славка Калчева
type: MusicGroup
popularity: 6
followers: 612
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xd531204084284fac892f2f1f08e348fc45c75660e61d7b4097dee63817dec133
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954659
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954659
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/dcd32fde-0216-48c0-9cde-26ab56b56013.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/dcd32fde-0216-48c0-9cde-26ab56b56013.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/dcd32fde-0216-48c0-9cde-26ab56b56013
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T06:14:42Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xd531204084284fac892f2f1f08e348fc45c75660e61d7b4097dee63817dec133","name":"Славка Калчева","registered_at":"2026-06-21T05:13:56Z","symbol":"NIM1830658","token_address":"0x2e51d37c410ae78edd98f7cf7757e1fde84e4bcf","type":"artist","uuid":"dcd32fde-0216-48c0-9cde-26ab56b56013"}
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 0xd531204084284fac892f2f1f08e348fc45c75660e61d7b4097dee63817dec133. Chain 2 (Bitcoin): anchored in block 954659 (2026-06-21T06:14:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dcd32fde-0216-48c0-9cde-26ab56b56013.json and https://artists.proofprofile.net/proofs/artist/dcd32fde-0216-48c0-9cde-26ab56b56013.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T06:14:42Z
  text: {"copyright_id":"0xd531204084284fac892f2f1f08e348fc45c75660e61d7b4097dee63817dec133","name":"Славка Калчева","registered_at":"2026-06-21T05:13:56Z","symbol":"NIM1830658","token_address":"0x2e51d37c410ae78edd98f7cf7757e1fde84e4bcf","type":"artist","uuid":"dcd32fde-0216-48c0-9cde-26ab56b56013"}
album: Славка Калчева
  type: MusicAlbum
  date published: 1989-11-03