Nikola Ivanov
type: MusicGroup
genre: opera
description: Nikola Ivanov Ivanov () (2 March 1861, Kalofer – 10 September 1940, Sofia) was a Bulgarian general and a minister of defence of the Principality of Bulgaria. One of the first graduate of the General
popularity: 11
followers: 3
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x9e05962e1acc7a3d4f94ba88dbee7e8ed70e8f23e1bfa174e98a352fa12c1311
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953727
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953727
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/8f9ee325-2b68-4a5c-8224-d7030aa29f65.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/8f9ee325-2b68-4a5c-8224-d7030aa29f65.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/8f9ee325-2b68-4a5c-8224-d7030aa29f65
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T02:33:01Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x9e05962e1acc7a3d4f94ba88dbee7e8ed70e8f23e1bfa174e98a352fa12c1311","name":"Nikola Ivanov","registered_at":"2026-06-14T19:33:05Z","symbol":"NIM0554303","token_address":"0xbc164ffd9379633cf2b92b795c0373d8943e8a42","type":"artist","uuid":"8f9ee325-2b68-4a5c-8224-d7030aa29f65"}
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 0x9e05962e1acc7a3d4f94ba88dbee7e8ed70e8f23e1bfa174e98a352fa12c1311. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8f9ee325-2b68-4a5c-8224-d7030aa29f65.json and https://artists.proofprofile.net/proofs/artist/8f9ee325-2b68-4a5c-8224-d7030aa29f65.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T02:33:01Z
  text: {"copyright_id":"0x9e05962e1acc7a3d4f94ba88dbee7e8ed70e8f23e1bfa174e98a352fa12c1311","name":"Nikola Ivanov","registered_at":"2026-06-14T19:33:05Z","symbol":"NIM0554303","token_address":"0xbc164ffd9379633cf2b92b795c0373d8943e8a42","type":"artist","uuid":"8f9ee325-2b68-4a5c-8224-d7030aa29f65"}
track: La traviata, Act I: Libiamo ne lieti calici
  type: MusicRecording
  duration: PT3M3S
  duration ms: 183160
  explicit: false
  by artist: Giuseppe Verdi
  by artist: Marta Torbidoni
  by artist: Michail Michailov
  by artist: Anton Keremidtchiev
  by artist: Elisabetta Lombardi
  by artist: Emilia Kircheva
  by artist: Alexander Baranov
  by artist: Orfey Petrov
  by artist: Nikola Ivanov
  by artist: Peter Petrov
  by artist: Sofia Philharmonic Orchestra
  by artist: Ljubka Biagioni
  in album: Verdi: La traviata
    type: MusicAlbum
    date published: 2018-03-02
  genre: classical
  genre: opera
  isrc code: DEAD61605003
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-06-08T12:36:56+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0xc99df7b5ca1ade12ff0c2289dddb2c2b7f5efbf1692214bf49f6e851891da5c0
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 953520
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/953520
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAD61605003
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-06-13T13:32:09Z
  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 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 0xc99df7b5ca1ade12ff0c2289dddb2c2b7f5efbf1692214bf49f6e851891da5c0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEAD61605003.
    date published: 2026-06-13T13:32:09Z
  audio: La traviata, Act I: Libiamo ne lieti calici
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 100.933
    additional property: Musical Key
      type: PropertyValue
      value: 10
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
      type: PropertyValue
      value: 5
    additional property: Danceability
      type: PropertyValue
      value: 0.316
    additional property: Energy
      type: PropertyValue
      value: 0.091
    additional property: Speechiness
      type: PropertyValue
      value: 0.053
    additional property: Acousticness
      type: PropertyValue
      value: 0.939
    additional property: Instrumentalness
      type: PropertyValue
      value: 0
    additional property: Liveness
      type: PropertyValue
      value: 0.43
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.281
    additional property: Loudness (dB)
      type: PropertyValue
      value: -23.98
    additional property: Key Name
      type: PropertyValue
      value: Bb
    additional property: Mode Name
      type: PropertyValue
      value: Major