鎌田琥珀
type: MusicGroup
popularity: 2
followers: 191
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xaa69e893292eb8b5e1e42c1a79ac5cf7c935eadd7227d30801fcc9f8447726a2
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/b0b6605d-8d03-4fcf-9e41-64e5a1d6e1b8.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/b0b6605d-8d03-4fcf-9e41-64e5a1d6e1b8.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/b0b6605d-8d03-4fcf-9e41-64e5a1d6e1b8
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T07:29:20Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xaa69e893292eb8b5e1e42c1a79ac5cf7c935eadd7227d30801fcc9f8447726a2","name":"鎌田琥珀","registered_at":"2026-06-20T12:35:43Z","symbol":"NIM1612949","token_address":"0x62db5deb37bb1f6e0c2d614313d1c11fd4e9dfc8","type":"artist","uuid":"b0b6605d-8d03-4fcf-9e41-64e5a1d6e1b8"}
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 0xaa69e893292eb8b5e1e42c1a79ac5cf7c935eadd7227d30801fcc9f8447726a2. 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/b0b6605d-8d03-4fcf-9e41-64e5a1d6e1b8.json and https://artists.proofprofile.net/proofs/artist/b0b6605d-8d03-4fcf-9e41-64e5a1d6e1b8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T07:29:20Z
  text: {"copyright_id":"0xaa69e893292eb8b5e1e42c1a79ac5cf7c935eadd7227d30801fcc9f8447726a2","name":"鎌田琥珀","registered_at":"2026-06-20T12:35:43Z","symbol":"NIM1612949","token_address":"0x62db5deb37bb1f6e0c2d614313d1c11fd4e9dfc8","type":"artist","uuid":"b0b6605d-8d03-4fcf-9e41-64e5a1d6e1b8"}
album: 満員電車
  type: MusicAlbum
  date published: 2023-05-06
album: 空色
  type: MusicAlbum
  date published: 2023-07-29
album: ひとつひとつ
  type: MusicAlbum
  date published: 2023-10-01
album: stay with you
  type: MusicAlbum
  date published: 2023-11-01
album: 僕のため
  type: MusicAlbum
  date published: 2023-12-01
album: 花のパレット
  type: MusicAlbum
  date published: 2024-02-10
album: 泣くだけ笑った
  type: MusicAlbum
  date published: 2024-03-01