Topka
type: MusicGroup
description: Topka () is a rural locality (a selo) in Bichursky District, Republic of Buryatia, Russia. The population was 483 in 2010.Всероссийские переписи населения 2002 и 2010 годов There are four streets. G
popularity: 6
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
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  value: https://explorer.copyrightchains.com/tx/0xcbe673e54c9ea7070387d0a9ff4a8af584b04e3aad2e4b425a8be7bac6c1844d
additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
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  value: https://blockstream.info/api/block-height/954065
additional property: OTSProofURL
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  value: https://artists.proofprofile.net/proofs/artist/4fe26666-4921-4955-913b-683d6f1bde7b.ots
additional property: OTSRecordURL
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  value: https://artists.proofprofile.net/proofs/artist/4fe26666-4921-4955-913b-683d6f1bde7b.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/4fe26666-4921-4955-913b-683d6f1bde7b
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 0xcbe673e54c9ea7070387d0a9ff4a8af584b04e3aad2e4b425a8be7bac6c1844d. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4fe26666-4921-4955-913b-683d6f1bde7b.json and https://artists.proofprofile.net/proofs/artist/4fe26666-4921-4955-913b-683d6f1bde7b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:11:48Z
album: Beach Day
  type: MusicAlbum
  date published: 2024-08-18
  track: Beach Day
    type: MusicRecording
    duration: PT2M30S
    duration ms: 150920
    explicit: false
    by artist: Topka
    in album: Beach Day
      type: MusicAlbum
      date published: 2024-08-18
    isrc code: GBMA22354164
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    additional property: OTSVerificationAPI
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    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-17T03:18:09Z
    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
    subject of: OpenTimestamps Proof of Existence
      type: DigitalDocument
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb36c1dcd03e9fea1be108ec6ef43d0807aae98aa862a54fde8fb0f797e14ae2. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-17T03:18:09Z), 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/GBMA22354164.
      date published: 2026-07-17T03:18:09Z
    audio: Beach Day
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 132.974
      additional property: Musical Key
        type: PropertyValue
        value: 11
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
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      additional property: Energy
        type: PropertyValue
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      additional property: Speechiness
        type: PropertyValue
        value: 0.03
      additional property: Acousticness
        type: PropertyValue
        value: 0.469
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.275
      additional property: Liveness
        type: PropertyValue
        value: 0.158
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.3
      additional property: Loudness (dB)
        type: PropertyValue
        value: -15.358
      additional property: Key Name
        type: PropertyValue
        value: B
      additional property: Mode Name
        type: PropertyValue
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