及川恒平
type: MusicGroup
genre: folk pop
popularity: 2
followers: 344
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xdc4d85714cd3781e25e329c656cab5727ccf9d286ccf9465e6a4847c0eb0ce0b
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/c1e2229b-9a95-4076-881c-3eb06b520c8a.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/c1e2229b-9a95-4076-881c-3eb06b520c8a.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/c1e2229b-9a95-4076-881c-3eb06b520c8a
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T07:29:20Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xdc4d85714cd3781e25e329c656cab5727ccf9d286ccf9465e6a4847c0eb0ce0b","name":"及川恒平","registered_at":"2026-06-20T19:53:15Z","symbol":"NIM1695887","token_address":"0x968a4f9368c474bb7f7cadb716e9d54ba044a0c4","type":"artist","uuid":"c1e2229b-9a95-4076-881c-3eb06b520c8a"}
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 0xdc4d85714cd3781e25e329c656cab5727ccf9d286ccf9465e6a4847c0eb0ce0b. 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/c1e2229b-9a95-4076-881c-3eb06b520c8a.json and https://artists.proofprofile.net/proofs/artist/c1e2229b-9a95-4076-881c-3eb06b520c8a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T07:29:20Z
  text: {"copyright_id":"0xdc4d85714cd3781e25e329c656cab5727ccf9d286ccf9465e6a4847c0eb0ce0b","name":"及川恒平","registered_at":"2026-06-20T19:53:15Z","symbol":"NIM1695887","token_address":"0x968a4f9368c474bb7f7cadb716e9d54ba044a0c4","type":"artist","uuid":"c1e2229b-9a95-4076-881c-3eb06b520c8a"}
album: 面影橋から
  type: MusicAlbum
  date published: 1972-11-10
album: 雨が降りそうだなあ
  type: MusicAlbum
  date published: 1973-05-25
album: 忘れたお話
  type: MusicAlbum
  date published: 1973-06-10
album: 面影橋から
  type: MusicAlbum
  date published: 1973-09-25
album: 東京暮色
  type: MusicAlbum
  date published: 1974-07-25
album: 名前のない君の部屋
  type: MusicAlbum
  date published: 1974-07-25
track: 面影橋から

面影橋から
type: MusicRecording
duration: PT2M50S
duration ms: 170601
explicit: false
by artist: 及川恒平
by artist: 六文銭
in album: シングルス・六文銭
  type: MusicAlbum
  date published: 1974-06-25
isrc code: JPKI07254066
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-06T05:59:20+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xdfa8117340e9ed1a2914488421cd8d2c6650f33aac632507bdacdc3b6a7b0b31
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 956889
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/956889
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPKI07254066
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-06T06:56:49Z
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
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: 956889
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-06T06:56:49+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 0xdfa8117340e9ed1a2914488421cd8d2c6650f33aac632507bdacdc3b6a7b0b31. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/JPKI07254066.
  date published: 2026-07-06T06:56:49Z
audio: 面影橋から
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 165.745
  additional property: Musical Key
    type: PropertyValue
    value: 4
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.339
  additional property: Energy
    type: PropertyValue
    value: 0.397
  additional property: Speechiness
    type: PropertyValue
    value: 0.027
  additional property: Acousticness
    type: PropertyValue
    value: 0.753
  additional property: Instrumentalness
    type: PropertyValue
    value: 0
  additional property: Liveness
    type: PropertyValue
    value: 0.148
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.33
  additional property: Loudness (dB)
    type: PropertyValue
    value: -13.016
  additional property: Key Name
    type: PropertyValue
    value: E
  additional property: Mode Name
    type: PropertyValue
    value: Minor