Sofia
type: MusicGroup
description: Sofia is the capital and largest city of Bulgaria. It is situated in the Sofia Valley at the foot of the Vitosha mountain, in the western part of the country. The city is built west of the Iskar river
popularity: 7
followers: 191
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x772d1075b0e1acef5c6ec9bdb414b17b1d5921b8021fd487ff346f1264731e41
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954065
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954065
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/49f710e3-595c-4c04-b77f-b339b0a12ad9.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/49f710e3-595c-4c04-b77f-b339b0a12ad9.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/49f710e3-595c-4c04-b77f-b339b0a12ad9
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:10:43Z
additional property: OTSCanonicalRecord
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 0x772d1075b0e1acef5c6ec9bdb414b17b1d5921b8021fd487ff346f1264731e41. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/49f710e3-595c-4c04-b77f-b339b0a12ad9.json and https://artists.proofprofile.net/proofs/artist/49f710e3-595c-4c04-b77f-b339b0a12ad9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:10:43Z
album: Colourful Way
  type: MusicAlbum
  date published: 2014-10-08
album: Colourful Way
  type: MusicAlbum
  date published: 2014-10-08
album: Colourful Way
  type: MusicAlbum
  date published: 2014-10-08
album: Colourful Way
  type: MusicAlbum
  date published: 2014-10-08
  track: Colourful Way
    type: MusicRecording
    duration: PT3M6S
    duration ms: 186553
    explicit: false
    by artist: Sofia
    in album: Colourful Way
      type: MusicAlbum
      date published: 2014-10-08
    isrc code: US43C1400867
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-20T20:53:30+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xd170c29ff2eff6f9816572e3a734a1fdf9be89d99dc22d68361ed472d2895cbb
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958931
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958931
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US43C1400867
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-20T21:15:01Z
    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 0xd170c29ff2eff6f9816572e3a734a1fdf9be89d99dc22d68361ed472d2895cbb. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/US43C1400867.
      date published: 2026-07-20T21:15:01Z
    audio: Colourful Way
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 97.992
      additional property: Musical Key
        type: PropertyValue
        value: 9
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.841
      additional property: Energy
        type: PropertyValue
        value: 0.446
      additional property: Speechiness
        type: PropertyValue
        value: 0.047
      additional property: Acousticness
        type: PropertyValue
        value: 0.783
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.006
      additional property: Liveness
        type: PropertyValue
        value: 0.336
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.893
      additional property: Loudness (dB)
        type: PropertyValue
        value: -6.851
      additional property: Key Name
        type: PropertyValue
        value: A
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: New Day
  type: MusicAlbum
  date published: 2017-11-30
album: New Day
  type: MusicAlbum
  date published: 2017-11-30
album: New Day
  type: MusicAlbum
  date published: 2017-11-30
  track: New Day
    type: MusicRecording
    duration: PT2M31S
    duration ms: 151811
    explicit: false
    by artist: Sofia
    in album: New Day
      type: MusicAlbum
      date published: 2017-11-30
    isrc code: USQY51797297
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-19T17:45:17+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x6856208146cc02bf7d0b968d9ed02adf71fb2c3b8371a7e547ab7b48fe4af4c8
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958761
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958761
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USQY51797297
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-19T20:47:49Z
    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 0x6856208146cc02bf7d0b968d9ed02adf71fb2c3b8371a7e547ab7b48fe4af4c8. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T20:47:49Z), 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/USQY51797297.
      date published: 2026-07-19T20:47:49Z
    audio: New Day
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 98.053
      additional property: Musical Key
        type: PropertyValue
        value: 7
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.735
      additional property: Energy
        type: PropertyValue
        value: 0.542
      additional property: Speechiness
      additional property: Acousticness
      additional property: Instrumentalness
      additional property: Liveness
      additional property: Valence (Positivity)
      additional property: Loudness (dB)
      additional property: Key Name
      additional property: Mode Name
album: Hurting

Speechiness
type: PropertyValue
value: 0.056

Acousticness
type: PropertyValue
value: 0.638

Instrumentalness
type: PropertyValue
value: 0.002

Liveness
type: PropertyValue
value: 0.072

Valence (Positivity)
type: PropertyValue
value: 0.904

Loudness (dB)
type: PropertyValue
value: -7.449

Key Name
type: PropertyValue
value: G

Mode Name
type: PropertyValue
value: Major

Hurting
type: MusicAlbum
date published: 2020-04-24