Maria Kalantzi
type: MusicGroup
genre: laïko
popularity: 4
followers: 102
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xcbef28efbac7ef5dfdf85daa348113dec1d141b16fb4c52a65c0dc2330528133
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/d26c7148-b60c-47af-b51c-0691b316058c.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/d26c7148-b60c-47af-b51c-0691b316058c.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/d26c7148-b60c-47af-b51c-0691b316058c
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T07:29:20Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xcbef28efbac7ef5dfdf85daa348113dec1d141b16fb4c52a65c0dc2330528133","name":"Maria Kalantzi","registered_at":"2026-06-21T01:33:40Z","symbol":"NIM1777569","token_address":"0x69ca38881b5601ee42220e8f0ad7e2e4730b9f05","type":"artist","uuid":"d26c7148-b60c-47af-b51c-0691b316058c"}
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 0xcbef28efbac7ef5dfdf85daa348113dec1d141b16fb4c52a65c0dc2330528133. 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/d26c7148-b60c-47af-b51c-0691b316058c.json and https://artists.proofprofile.net/proofs/artist/d26c7148-b60c-47af-b51c-0691b316058c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T07:29:20Z
  text: {"copyright_id":"0xcbef28efbac7ef5dfdf85daa348113dec1d141b16fb4c52a65c0dc2330528133","name":"Maria Kalantzi","registered_at":"2026-06-21T01:33:40Z","symbol":"NIM1777569","token_address":"0x69ca38881b5601ee42220e8f0ad7e2e4730b9f05","type":"artist","uuid":"d26c7148-b60c-47af-b51c-0691b316058c"}
album: Triantafulli einai to fili tsiftetelia
  type: MusicAlbum
  date published: 2004-06-25
album: Figame Kardia Mou
  type: MusicAlbum
  date published: 2020-02-08
album: Kataramena Feggaria
  type: MusicAlbum
  date published: 2023-03-13
  track: Kataramena Feggaria
    type: MusicRecording
    duration: PT3M40S
    duration ms: 220106
    explicit: false
    by artist: Maria Kalantzi
    in album: Kataramena Feggaria
      type: MusicAlbum
      date published: 2023-03-13
    genre: laïko
    isrc code: FR96X2387287
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-16T07:26:19+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xd21153d7f1dcbf484147440a7bed06cd6ca41ebb0e0e5fbb96a7e3aaa2922081
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958271
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958271
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR96X2387287
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-16T09:16:54Z
    additional property: OTSVerifyInstructions
      type: PropertyValue
      value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
    subject of: OpenTimestamps Proof of Existence
      type: DigitalDocument
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd21153d7f1dcbf484147440a7bed06cd6ca41ebb0e0e5fbb96a7e3aaa2922081. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR96X2387287.
      date published: 2026-07-16T09:16:54Z
    audio: Kataramena Feggaria
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 99.928
      additional property: Musical Key
        type: PropertyValue
        value: 4
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.613
      additional property: Energy
        type: PropertyValue
        value: 0.743
      additional property: Speechiness
        type: PropertyValue
        value: 0.036
      additional property: Acousticness
        type: PropertyValue
        value: 0.038
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.118
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.649
      additional property: Loudness (dB)
        type: PropertyValue
        value: -9.873
      additional property: Key Name
        type: PropertyValue
        value: E
      additional property: Mode Name
        type: PropertyValue
        value: Minor