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 0xd0ae3c2fbfcd40b468c42623ea9f18387c4721c6de38a35df9f196e3a246cb0b. Chain 2 (Bitcoin): anchored in block 953600 (2026-06-14T06:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0f2afe1b-36b4-4c94-a937-1329980be938.json and https://artists.proofprofile.net/proofs/artist/0f2afe1b-36b4-4c94-a937-1329980be938.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
ショパン:前奏曲集全集(24の前奏曲 作品28/前奏曲 嬰ハ短調 作品45&変イ長調)
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」
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 0xcd7609204e80190bc0ae397aebdd37aaa8fc967e0989d641281ba9709c4873d5. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/JPPC09102480 — a six-check JSON result.
ショパン:ワルツ第2番 変イ長調 作品34の1「華麗なる円舞曲」
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff42d77324a63ecbefc299fee09acf6191b97deadbc4a4b666fb4b156e849c8b. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/JPPC09102490 — a six-check JSON result.
ショパン:ワルツ第4番 ヘ長調 作品34の3「華麗なる円舞曲」
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6be46262e82e7624dcff6d86d0c6c327a597f3744447b585f7f241a68428a09. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/JPPC09106970 — a six-check JSON result.
ショパン:ワルツ第5番 変イ長調 作品42「大円舞曲」
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0479dfb861823352480a58768e25ed0b4a6ef0d849b2ed3d6fa616c85309cd3f. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/JPPC09106980 — a six-check JSON result.
ショパン:ワルツ第6番 変ニ長調 作品64の1「小犬のワルツ」
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd3a22ea2976bfa1f42e33ea3c20af46b988ef0a2e24405feacfc6c3524cc1ce. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/JPPC09102500 — a six-check JSON result.
ショパン:ワルツ第7番 嬰ハ短調 作品64の2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f29b130a98cee09c2674ef91e1b37f8de62dbcfca914a6e2f897f64f1f4a7fb. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/JPPC09106990 — a six-check JSON result.
ショパン:ワルツ第8番 変イ長調 作品64の3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fbfbb19fdd5322b9560d40babc53f77f284eb4c6004668c98df52e103d18158. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/JPPC09107000 — a six-check JSON result.
ショパン:ワルツ第9番 変イ長調 作品69の1「別れ」(遺作)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83ea44188e0385c4213cd63226d88f4af966bf7effe41a038eb36afe313f83f8. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/JPPC09107010 — a six-check JSON result.
ショパン:ワルツ第10番 ロ短調 作品69の2(遺作)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa64110f56ff87c5c8e7bdabb51a5e5ed575e748453e6fb655668e2cf55a88f2. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/JPPC09107020 — a six-check JSON result.
ショパン:ワルツ第12番 ヘ短調 作品70の2(遺作)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99180d649caef302be633bf208918aeb013385f3cba8fffd4a14fc760cada70d. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/JPPC09107040 — a six-check JSON result.
ショパン:ワルツ第13番 変ニ長調 作品70の3(遺作)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd6d867a85983e7e879ad584b412503b2e325ea6ff1d1961fcb16c7dfadeb8f9. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/JPPC09107050 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ef36f978e3b4c86a8644ef321adeda46a128d371dfa2b289a8cce93b1c6d22b. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/JPPC09107060 — a six-check JSON result.
ショパン:ワルツ第17番 変ホ長調(遺作)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf13faf5540b899db7ff234db92156a2259421bb5fea5fc96e2ad615f79827a52. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/JPPC09107090 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d706e46cdd563d6780da2cbd9d5b05b5be0c0a09bcdae324a4244aa3856596f. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/JPPC09107100 — a six-check JSON result.