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 0x6c5b3c8e87dd8e5a5698f4ee8347e229acd9e79ee28f6b2903beead37f71d389. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b4dbb864-4774-464d-a1f9-c2a51b06d7d7.json and https://artists.proofprofile.net/proofs/artist/b4dbb864-4774-464d-a1f9-c2a51b06d7d7.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6f870bd5c46f8f54f1e76040aa4616cf5f823b8b2798d880a2a6077800157ac. 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/ATME42000122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa32ad9a944256bd0b51602cf1cc118234446729776a14f2d4b47b862f574b496. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ATME42000137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b3f711c577bd938dc288431235397cb31f4ccac8fa0cc1477503ae111b229fd. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/ATME42000121.
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 0xfc75aeba734c5d8d6c5f5a2b5a6e3b276e926cbd1f32c3dd91fd752ec0843230. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/ATME42000123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6d4bd18454d0de32fe4c360acf098c2932e52320979603afb16f6448da1c4cd. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/ATME42000125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6225f943307c562675755db2194cc55bacb9d58cb9023221d379865c998586e3. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ATME41700107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00f429aaf4c2870ce07976a53e02834987561bc85c4cb2d9d76ec8a1edbcf552. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ATME41700108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00bc255a629a221c8a1ccf2dd3ca89b6eef9bb8fe05451e42d6bf09e523c8249. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ATME41700111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7788308fd8f216a4bfb80e4f48fec5619d71c221e77147eb192c4260ba205b2. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ATME41700113.
Fünf Stücke für 2 Violinen und Klavier, OP. 97: V. Polka / Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98e32198f949081a1cf237ca85f94a6523a8f27e5c153c16bab2b5110d6918fa. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ATME41700117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03c44d4cf3c5a09e59f04fa387795519ff09cc2e03b0c0c484941a44d6796464. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ATME41700118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19fd0b021bccda7653e780dee71333b893dd345faddb89cbd995f81433205fe1. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:49:26Z), 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/ATME41700119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b7d251b988b2e90c84a76e50b4242e54ab8b3aab027c190fda32c7fc5309666. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ATME41300067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72a8d16891b41112df53afc84cc416c929eca947ec2c10e6be0759284672f517. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ATME41300084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3889818228492676e6ca0c46e1bff4a5c701898991de92ccd005f698a273f1e. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/ATME41300064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5855b926167cbac6d4802f2eb3e73a9fb908b98f7710e05fc8dcf9e449f1f89b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ATME41000048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde796b787179cbff0eb30b0929ab8b95de7d2b43d6863647335bca1f8ab73b3c. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ATME41000049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70e50cb75fe7ab376a746e981f8bc6902684b67ada1928443f9d1d09f25b1066. 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/ATME41000050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0fd61f8a7b61c7721b8e96ce771ac00d4f8eb62faf9df0558f4cecf26e0af36. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ATME41000052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1925a14c7c7988276c31103f28530609ef79adf1e58ff79bb6199c8bc93933e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ATME41000053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4860cfad744f59fd7a3a26923754c0f0061f8281d04311d0517acc266779de9. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/ATME41000054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7208698e7f8d061afefe98f71c324946872cbcf7dc454ebc24777ef3cc518c2. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATME41000058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c7b08fe491d293352e660ca339800a24c1f689ec4ea6881e5be881f61b9de4b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ATDD70900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bddf2b46b37a47cf13237b965a4ce6642537281190e66644a5fe558fa57c696. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ATT251116190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a6a11d4f917ddadde7a4cef9a1c6e1b93ef5fe7cf868b5dc1c3850dae63a90. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEEP81100668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26c4b18dabc2d41617ee22ab5c34ea7ef7a00baf8321e8c1b87ea57ce6b2c036. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ATT251000830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaed5ef1cf47985ca92c5196a65e5ee4c7a0f65eec2fcc5c84f59d95451482ba. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEEP81100683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x607d598cc7b1cc5982dd15488fbf1dfbc46d5eb4eee764e076eda2b86b0ff500. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ATBH81100305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5b5fa6a7861ab28f6b71b4a6feb42d11fc66477bc6897a3c8879b5c76663921. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEW241000386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ff317923e70cf3557f732039490c7f3117061708474b8a3ba9e0fa1c420a419. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ATT251101320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31938b8c26a6c5aa8481fb12651dee25b667fbe3bdd53a1e1b778fbfae4ef061. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ATBH81100314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6990ab55203565f3137a846c8b57a637a2458bb23482cdf33c4aa9f063193483. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEEP81100669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dd238797fdd58e04345d6eb2bfb17925ef3f0162d2f8625ffb277d24ad7fd3a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEOM41100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4065dafad811effc3054be48af79aca143bb3d92ffcbe98addabdf104d860884. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ATH301010030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafdb9b6efc167a15bae85d6e947b35415b7d4e47c0c6e5e15c0b1d476ea9cf4a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ATT251104480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a932e38714f0c57448975ab2f50e124654ecec604be2a291bab9ed91af5a2aa. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEEP81100680.