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 0xd01cdff1303e56eed946e51df15f1e05609898ed83870b7606ba98d36c3f2e50. 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/1dc520dd-beed-4268-a43d-80673059a290.json and https://artists.proofprofile.net/proofs/artist/1dc520dd-beed-4268-a43d-80673059a290.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 0xf6c1788b43f0a9e630b2e46d61aca29fbc743bf7e59e88ecece7effad9d16967. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T17:01:39Z), 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/QZHN62263702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb0432d244cf872a3805e2f8871738a0e222cf2ec6101a9218ad8469fe93b6a3. 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/QZHN92294001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ee1bfa603998141cc426d2d10e809b2f6d32f7bbfef635ec5de031be544259d. 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/QZHN92294002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd48a42788067419651b7435055600e7a5eda8aaa1a4bb1561bf43ba7d0e257f. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZTB22418784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fdeabc5c1db6ed38f6a07c8a792fd76d54e1c43f18fcc5142b67cef4e382c52. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZZ772510815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89a3734dce12b74a210eea5b11cac6eededffcf1ad2d22b04d213d80dfa71a11. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZZ772510816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63d109088e87554b8fdaecc757b1b98a26841ac9bb5c0e164a950b18609f0f36. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZZ772510817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87ca024c403231ce66a7dac8702886fd7e9a27881b9eeb5d3d2f33cff605f44b. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/QZZ772510818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74519d48f59b2166f916a9ae2185c298211d06ccb34a346a9434368f21210b7e. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZZ772510819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fce1b91d447aaa59bf507bfc0ce5736dec972aaf071a5f7f35f6c131cb80d05. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T16:29:47Z), 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/QZZ772510820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x426391e4d6628a12faa0b8a48cb929c10ea5e28219a54bd12e2ac8539afc460e. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZZ772510821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf5f104f4fdc3c59d3030a5c4d230799e9405042c5514e79f55c7155ed922046. 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/ZAKN82000106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d470691edb797ab578c3cb8e72dafede80afe316e6566e1b8f691d217d74ccd. 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/ZAKN82000111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb8a5af8aeb5f3264b60a8ef8340ba3be18b7b2b912d352a10eadd4d8b742ebd. 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/ZAKN82700111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c7c1cca41137c5a67009cf5c90a410ffe1c7f290cda92f504938520c4c29a68. 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/NL4DU2000154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc09eade5abb883564bbb0ca392a3638964959b9006ab01489dee36c353d76115. 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/NL4DU2000155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x796c771cf064f4596cc40ce84c2f1904958e9d304bb255208f580240bb44b0d3. 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/NL4DU2000162.