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 0xc3e9df486256d678b5649f87674b7410057eb55d808231afd4a24a640c66fbbc. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ba77897c-2be4-4ed5-a58e-4bdcb1defb4c.json and https://artists.proofprofile.net/proofs/artist/ba77897c-2be4-4ed5-a58e-4bdcb1defb4c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xc9c3e35ae03cadd0d5ff602f979ad9ed757d8bd23b325296c13752f7bd2a0e36. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/JPPO08391690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc5881e6e8219b61e2ea289792f52b6e35e3de40a20895eefb6778a00b602b87. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/JPPO08391700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcafc1bfc3cc248b055112e6bcf60a5daacf8409511b748786bd8bfda5e174227. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/JPPO08391710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10d4beacf2dc58e2c224a068df44833622327ae8462534385d7e0d38b6e51548. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/JPPO08391720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e2c84f81c077c8cd7f203d30cbe9fa4a4e6a7bb9a294ef0a0c2659d33137f20. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPPC07250152.
はなびら ＮＨＫ Ｈｉ－Ｖｉｓｉｏｎ 山下清の見た東海道五十三次～童心スケッチ～
ゴールデン☆ベスト 石川セリ シングルス・アンド・モア
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8787aced49b6dd4990354de95bd52d40188c47686c5185b6816ae173bfa029fe. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/JPPO00320690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d0f2b870068902bafbb7ede137c55fe6497bba684573288b65e16518d4dfa3c. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/JPPO00320720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76bd00b6ba1617971be79e8232aafd5f62c392ba0e47834d3d27b2c72d58f272. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/JPPO00320740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87c20f41273c3abc19584438ee46e0b361897bc164ffc3933e2d717331823d9c. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/JPPO00320750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc378ecd41482ac733ac3d5419aadb2b0f7beb66b6f2d0d8d5d009f410f163dc1. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/JPPO00320760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85e040a03741722a6b147a1124e8a19aee5257f15963c20222693f4d79defddf. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPPO00320780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ffc762dc79ccdaab9f314383c6f8dbd9986d20a07169fa75c651f082ed8645d. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPPO00320800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09bf661108d7ebd9df670c3b34075642eb283b2f5f326973963169f6c1eeced7. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/JPPO08391730.
谷川俊太郎 ソング・ブック・・・6人の歌姫が詩をうたう
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81745988656e84db9935566f4d205e6179ebfe0f690fdb8fd4ed185c6a5f550d. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPPS00501670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1b8606590ec1a53a1309a241ad40d3fb56719832fb52086ea14825db28e280f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/JPPS00501710.