Софи Кальчева
type: MusicGroup
popularity: 2
followers: 82
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xe1451b3d1add756a9790d14ad5a573aad5a6d1e325801bf65c0c784749515ebe
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954638
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954638
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/d46646b9-4652-4f2e-8544-0a73d654c9bb.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/d46646b9-4652-4f2e-8544-0a73d654c9bb.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/d46646b9-4652-4f2e-8544-0a73d654c9bb
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T03:45:44Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xe1451b3d1add756a9790d14ad5a573aad5a6d1e325801bf65c0c784749515ebe","name":"Софи Кальчева","registered_at":"2026-06-21T02:31:30Z","symbol":"NIM1792072","token_address":"0x179190e3fcbbf61ed4131574b916b329266037dd","type":"artist","uuid":"d46646b9-4652-4f2e-8544-0a73d654c9bb"}
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 0xe1451b3d1add756a9790d14ad5a573aad5a6d1e325801bf65c0c784749515ebe. Chain 2 (Bitcoin): anchored in block 954638 (2026-06-21T03:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d46646b9-4652-4f2e-8544-0a73d654c9bb.json and https://artists.proofprofile.net/proofs/artist/d46646b9-4652-4f2e-8544-0a73d654c9bb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T03:45:44Z
  text: {"copyright_id":"0xe1451b3d1add756a9790d14ad5a573aad5a6d1e325801bf65c0c784749515ebe","name":"Софи Кальчева","registered_at":"2026-06-21T02:31:30Z","symbol":"NIM1792072","token_address":"0x179190e3fcbbf61ed4131574b916b329266037dd","type":"artist","uuid":"d46646b9-4652-4f2e-8544-0a73d654c9bb"}
album: Давай забудем
  type: MusicAlbum
  date published: 2019-07-18
album: Избранное
  type: MusicAlbum
  date published: 2019-10-29
album: Избранное
  type: MusicAlbum
  date published: 2019-10-29
album: Избранное
  type: MusicAlbum
  date published: 2019-10-29
album: Телефон
  type: MusicAlbum
  date published: 2020-10-09
album: А что если можно
  type: MusicAlbum
  date published: 2021-10-05
album: Дождь
  type: MusicAlbum
  date published: 2023-11-24
album: Венеция
  type: MusicAlbum
  date published: 2025-09-26