The Checkmates
type: MusicGroup
genre: doo-wop
genre: indorock
popularity: 15
followers: 424
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xfd05d62f7cdb533a87ea1cd3d8ccab51525474a59b1f26bf93b55fb8333a7d30
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953706
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953706
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/7ba97db9-a5fc-440a-a49d-552bb6e011ab.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/7ba97db9-a5fc-440a-a49d-552bb6e011ab.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/7ba97db9-a5fc-440a-a49d-552bb6e011ab
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-14T23:14:49Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xfd05d62f7cdb533a87ea1cd3d8ccab51525474a59b1f26bf93b55fb8333a7d30","name":"The Checkmates","registered_at":"2026-06-14T17:27:43Z","symbol":"NIM0524442","token_address":"0xa54091a6e71d1f3b9eb529e22441fa66a055ce52","type":"artist","uuid":"7ba97db9-a5fc-440a-a49d-552bb6e011ab"}
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 0xfd05d62f7cdb533a87ea1cd3d8ccab51525474a59b1f26bf93b55fb8333a7d30. Chain 2 (Bitcoin): anchored in block 953706 (2026-06-14T23:14:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7ba97db9-a5fc-440a-a49d-552bb6e011ab.json and https://artists.proofprofile.net/proofs/artist/7ba97db9-a5fc-440a-a49d-552bb6e011ab.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-14T23:14:49Z
  text: {"copyright_id":"0xfd05d62f7cdb533a87ea1cd3d8ccab51525474a59b1f26bf93b55fb8333a7d30","name":"The Checkmates","registered_at":"2026-06-14T17:27:43Z","symbol":"NIM0524442","token_address":"0xa54091a6e71d1f3b9eb529e22441fa66a055ce52","type":"artist","uuid":"7ba97db9-a5fc-440a-a49d-552bb6e011ab"}
album: Come Softly to Me
  type: MusicAlbum
  date published: 1982-05-02
album: Come Softly to Me
  type: MusicAlbum
  date published: 1982-05-02
album: The Checkmates
  type: MusicAlbum
  date published: 2011-12-25
album: Emile Ford presents the Checkmates
  type: MusicAlbum
  date published: 2020-06-28
track: Percolator

Percolator
type: MusicRecording
duration: PT2M13S
duration ms: 133333
explicit: false
by artist: Billy Joe
by artist: The Checkmates
in album: Ace's Golden Age of American Hits, Vol. 1
  type: MusicAlbum
  date published: 2011-04-01
popularity: 7
isrc code: GBBHN0700111
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-06-27T10:22:58+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xe7c9b1a970412f45ced05666ed0ba31325f0beda96848afef9bc9f4a2f32ea9f
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 956304
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/956304
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBHN0700111
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-02T03:55:08Z
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
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
  value: verified-cc-db-prod
additional property: TokenDeploymentConfirmed
  type: PropertyValue
  value: true
additional property: ContentHash
additional property: BitcoinBlock
  type: PropertyValue
  value: 956304
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-02T03:55:08+00:00
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c9b1a970412f45ced05666ed0ba31325f0beda96848afef9bc9f4a2f32ea9f. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBBHN0700111.
  date published: 2026-07-02T03:55:08Z
audio: Percolator
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 150.701
  additional property: Musical Key
    type: PropertyValue
    value: 6
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.721
  additional property: Energy
    type: PropertyValue
    value: 0.547
  additional property: Speechiness
    type: PropertyValue
    value: 0.113
  additional property: Acousticness
    type: PropertyValue
    value: 0.584
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.016
  additional property: Liveness
    type: PropertyValue
    value: 0.072
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.887
  additional property: Loudness (dB)
    type: PropertyValue
    value: -13.902
  additional property: Key Name
    type: PropertyValue
    value: F#
  additional property: Mode Name
    type: PropertyValue
    value: Major