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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 0x9704445cac7e733833fb752b2a291fa2e90f25989aad6f2effa04c90caa84a8b. Chain 2 (Bitcoin): anchored in block 953717 (2026-06-15T01:05:33Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/88116fcd-551d-4024-80b0-540436a0b398.json and https://artists.proofprofile.net/proofs/artist/88116fcd-551d-4024-80b0-540436a0b398.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 0xb71b6f7451f04a688baafd3486934217e8dfd14fcc85a5afc46042ed1bcb8b70. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USCGH2065474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed3b5a27e753e2fc3817b1e4f1503225ab9983ba46d8a3ca022521eff8b934f0. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM92250928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90c5b7506da483cb98da81cd6c67448badcbc51d1910004fbb03c999b994fb7b. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM92250930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8de6a0d88426aff032f830b7d43579af05692ea654b155e6194bea58de9771c0. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/USHM92250931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x869c3f6a309fe3a9e2fd3a0fea77b9550efcdef7037b4ab54039c2abd76bdbb0. 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/USHM92250933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38baf5bc43b5ab35ea221980be5156d1662a2c47b4b707b85a67f64cbc312265. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USHM92250938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3df42069932cae7337a6ef8ddb71f0e88ff022afef0bd9e88c266ba7f0804f03. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USHM22439435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x858fbc4ebc3603ea42705612af8dbdd6fc5925447c77dabe5a27c0322fbd2e40. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/USHM22439436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3369c6d48f30e08afe822d46769a28e6bca7b8b8726368584ed6d8c0be07d55d. 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/USDY42474623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x051b0d50b652ff16abc8c7e90c2bfc7795be85ac1a3adba8c4f399a9d4a3919e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USHM22439437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x318be3730c031f42261e8ea405092d0c8d8fcdb49daae20ac311663db157a3e9. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USHM22439438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3637f70e42f5ca82d37e0f906f53f9689b3f53ba20f30c766c08564a8e2722d7. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/USHM22439439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46a70c6987d1b1da2014c0c3a775522c80983f3459bc5ea64264904d0f1b4f38. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/USHM22439441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf214be835fdedc3a80c1f82402582c3a1d9ebca104b54ed3c8f8e8c91869c549. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/USHM22439442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc1131eb3778f2b16265bb1944964ce84bf8974570c35f6c6bacd4acecdbe588. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM22439443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb091d25d57f294b61fea7d2e22513e0826101e934f0b6ed65b8af40329696e9. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/USHM22439445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74b43c7b6cb4276e7287d602383e1230b143bbb178783ceac16ef7a1553d9f3e. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/USHM22439451.