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 0x78a236202c76f397161846bb24f546725fbbd4f92f59082af848ebdf01346b0e. 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/cc1c5964-ce58-45b4-95c8-1d48df7ef4fc.json and https://artists.proofprofile.net/proofs/artist/cc1c5964-ce58-45b4-95c8-1d48df7ef4fc.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 0xcf9894706b2442d71c6e296432b49971a36150275fc1b22fa5680a22e4d7b1d2. 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/QZDA52164314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd33956144dd68c4bd30e7e27a05b9f8a6a4c63a3aa0ae5d259c77f9c9a56e8ea. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QZDA52162533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81f7325fbc3cacf7a9093a2258ce66843fbdb8aec02d89d5dc2637b3383e4f14. Chain 2 (Bitcoin): anchored in block 958681 (2026-07-19T06:14:54Z), 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/QZDA52164317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x702af6500d173c5f81582b31b7acbc495517945046787253bef37687ccd02d2e. 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/QZDA52162535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d40ef28cd87008396089c1996e72606f7ab4300761f685484b40489fbae6d3d. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZHN52367224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x303a6b1007d5ecaefad7b5a70610cb5e8ba36d6ee6e69939f07a33205377b1e1. 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/QZHN52367226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb79d97debcf4fe52aee1aeb29253e74b293e224ee77f9ec9e9e31385d9e6a1e4. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZHN52367227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57bc168bd385fe424fd16766e5444e0e2dd7b97c39aef55bedc5515b2fe7ee3f. 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/QZHN52367229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebcaabffd6c27f92c9133583e230ac7880fe2fb0cb273eb90cb60d389a96f4df. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZHN52367230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcab5f00eed8d78630ef13d849ebced699ae22beb008c041b64c2e987809baa8b. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QZHN52367231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5582118810e75034db2a2085547283f0f27ec5dc851459f370d79bf3415670c0. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZWFL2316533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a9d7e1954f8855b16a0b650301a0dd8b2bf182b4298442a7aff979a03b85812. 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/QZWFL2316534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73f9e5b062dcaddd57eb42d7420e003a128d5c85def08c60500e6e82608e1255. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QMB622406021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa050d9d540b9e240209f25307b6ace768ee154e7bf4b9c94c5650e386162434d. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QMB622406026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73f9e5b062dcaddd57eb42d7420e003a128d5c85def08c60500e6e82608e1255. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QMB622406021.