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 0x4d423e162b54dabf6e7d41d4980f68bc4fb03c2fcbc507f0f477c657618d1469. 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/f715ec0e-6f96-4917-acf8-3a4f76696100.json and https://artists.proofprofile.net/proofs/artist/f715ec0e-6f96-4917-acf8-3a4f76696100.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 0x54e0c51cb1506627dc56d40275035e6f3193d6a48bf110792d66b50079fb1409. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/CA5KR2218544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44db130a727947470176dc2920e8efab1db3db9116c24b89e9739ca19ac95f1e. 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/CA5KR2319893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10914138035e37f03eb7191ca743dfb32311c554ea9edc7019250276d4e1047d. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/CA5KR2321686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b16f4f8f63d76df48d456ee0ed9422119021197d72b0da70cc1c0e619abeda7. 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/CA5KR2328999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bc21a70bc0172bbd8298c1dbbd574d01bad4fa292ed0ca1594c1409957e0d51. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/CA5KR2336836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf5082baee9dd28b16e8c626f9cd2496d27a888925a0f0a3cf1cbc81a7b473a5. 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/CA5KR2336837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57fbf75b7a51aeed0a8b6539ba43f815397dde7a6a94f2599275f199e6a50438. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/AUK3B2300016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b39ccd72b87d0bd3f9b619af2840e298c3a5a53a92204c411a69f8a4b66e5be. 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/CA5KR2414165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b7365f3374c12b3cfebf77b079da9a5ba079755aa567d67282041d2a1daaa72. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/CA5KR2433809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65f0520c8cb1649b7a08ed27bd80fbb7302da2744810d8a7fc2fba22dea9e1c9. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/CA5KR2440039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4444b734110c54e1c0b87b2804d8225b298baa26c5a4ddd5b48addc24921abc5. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/CA5KR2440040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc52891adfb895aff4588b96a1ccc6f6e5366d4bfcaf308b9ba223f0d49fffd98. 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/CA5KR2440042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x600903d5d0454ed73906e31534135da53cbfde7f8c7d4056057ea4fce63889a5. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:07:14Z), 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/NL8RL2460998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfab4b13574ba7687f2ca43bbd1adf9537cbe5638443b2a88486c1097e7e55ca1. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZTGW2407111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6f6fb2402d49ba9a646c7fab6895130a57fbfbd769386b8ada08abb47e0227d. 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/CA5KR2177605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0686a449c0982e865b9cfcc2ebeb81c4e7e08338fa07459255bd360d74525b70. 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/NLRD52302482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42b7229897ae496a612aef79e3f9d8f420204e52cd51039f0efc44e8e2629a3b. 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/CA5KR0009941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42b7229897ae496a612aef79e3f9d8f420204e52cd51039f0efc44e8e2629a3b. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/CA5KR0009941.