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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36c998629d14a97c1a66c73cd035656a121a477b543f7d5bda328efe811ba2ac. 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/d819a252-cc30-4f3c-b654-a93ff097b935.json and https://artists.proofprofile.net/proofs/artist/d819a252-cc30-4f3c-b654-a93ff097b935.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
あなたへ-旅立ちに寄せるメッセージ（アルト）
今井典子、岩田真奈、西川美幸／吉田けい子
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9197361a32937922b27303c2279b69e2890df163c700369cf43ba0edc6723ba. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/JPU971909071.
あなたへ-旅立ちに寄せるメッセージ（ソプラノ）
斉藤博子、西川直美、弓田真理子／吉田けい子
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72f4af2b08b053fec2a317db07dc3371dcd9ec1470e1e50acfa01bc4911efaef. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:59:01Z), 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/JPU971909059.
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
あなたへ-旅立ちに寄せるメッセージ（テノール）
梅崎英行、金沢平、宮西一弘／吉田けい子
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x573b46d2384cd9e6c0eb4c173597f2466b88937990a3d4c71a9d599df8d36c3a. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/JPU971909083.
あなたへ-旅立ちに寄せるメッセージ（カラピアノ）
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x272a208b53e9779c4881bb75e1cedd2b2da56e02866b234f70b26dd273f92a92. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/JPU971909097.