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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3848240ac5186db086c56a58d844a83d8e4bd9440661d6e515ad94cfdb3e421d. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/176f4222-60de-4774-9f36-5cc9b51fc7bb.json and https://artists.proofprofile.net/proofs/artist/176f4222-60de-4774-9f36-5cc9b51fc7bb.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
TVアニメ「ピアノの森」 Piano Selection XI ショパン: エチュード イ短調 作品25-11「木枯らし」
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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67cd24f8ad11075d12d633e48e4e81ba9b483958b3d555ff0b92a87907c342b5. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO01812530 — a six-check JSON result.
TVアニメ「ピアノの森」雨宮修平の軌跡
モーツァルト: ピアノ・ソナタ 第2番 ヘ長調 K. 280 〜第1楽章
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x180dc1fe2009d8adbfa0abe2ab80cd1bc2fda340da4de89ec4c469c9f17a2b32. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO01903060 — a six-check JSON result.
ショパン: ワルツ 第1番 変ホ長調 作品18 「華麗なる大円舞曲」
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x955e22c927bd45a36d7210fb5cf7596c0b88c7272409892a1e5adc96d2978410. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO01903070 — a six-check JSON result.
ショパン: エチュード 嬰ハ短調 作品10-4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x456f4808d93cfbfa5f31273563de01235f5ed2418b6d03ee4f05d32dc61bee2b. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO01903080 — a six-check JSON result.
ショパン: マズルカ 作品59 第3曲 嬰ヘ短調
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa445bea30f584ae2587a4cb9d1e71dd5251d31503fcb61fc60f00e7f0a66c41d. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO01903110 — a six-check JSON result.