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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 0x59ad44917ff293e3ff9a14dee5173fea6250d3532b80e15c141df8c930c0e15d. 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/4b4b7ce3-8ef9-49e7-b2c4-7e15894368e6.json and https://artists.proofprofile.net/proofs/artist/4b4b7ce3-8ef9-49e7-b2c4-7e15894368e6.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 0xe427a42c284b5167a4afe781e673ac81b16fc2f59cebbb4bcdde4c6ac3fe1ae7. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T19:05:13Z), 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/JPU902100732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b04550db0a05c32a5fcb81f257555531a12b3e5fbd6150c12a623dad4f37bc4. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/JPU902302971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2440f81ae3c4711e86490e10df4fab1de87506363b2cc695393f5776caf421c. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPU902303093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb809a0aac570b6736d9d145639839214ae4972a39d691e6654a18472ca3ff28c. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/JPU902303152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2440f81ae3c4711e86490e10df4fab1de87506363b2cc695393f5776caf421c. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/JPU902303093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe427a42c284b5167a4afe781e673ac81b16fc2f59cebbb4bcdde4c6ac3fe1ae7. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPU902100732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b04550db0a05c32a5fcb81f257555531a12b3e5fbd6150c12a623dad4f37bc4. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPU902302971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91df3f1414b212e549928e65315a05046b42868aa24b73c11d092c5ff654fb17. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T04:21:37Z), 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/JPU902303153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9abdb7b6edc5efa8c702a311fd56d31c8b6221e1674acba7bbfc1099129da5. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPU902303154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21b8bd5df1ee69dabdfaafa9b9e77f5c21e8f4c3f72a7623f985c10e10812770. 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/JPU902201396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5ed4c1a06bb325fc14bf629e2e3b57a893bf3d5dcec40f57ac9c51d11299185. 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/JPU902303155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdad86d2bf48fb71aea20f265e3ef5cc5e2a85cfb1413240b2abb09f9ede63f0e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/JPU901900249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc35b8864acbf9acaa3375012aa847f1394cdcbf40d2faef17dfc20abd1b0b473. 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/JPU902301821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdad86d2bf48fb71aea20f265e3ef5cc5e2a85cfb1413240b2abb09f9ede63f0e. 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/JPU901900249.