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 0x238ab9a525e436c5bcde5c53b40625922d760af0b03cc6041b780a2b0bfd8143. 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/9d328519-f270-48dd-bb83-ac1208ed4b3f.json and https://artists.proofprofile.net/proofs/artist/9d328519-f270-48dd-bb83-ac1208ed4b3f.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 0x3400b04e90987c3454f6fb1487c315f3b8e71c7d19f70fb118ef969d94cb6504. 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/GB8KE2214692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ea1773bd78ec7a55335e2841635b079de7e9fea4e5e418409dfd578d801a0f. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GB8KE2412453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1a7d77041ec0d63ffa193765d6c7689e74ac8e51f1a177d246c1cf3bdc21955. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZK6J2159321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c2b8d5e954a7f58e0b5c735e0470e0c6154f3cbe1a82cfb0bc20b6051f7ef45. 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/GB8KE2303559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4574cb2abbe9bff7e75feff1fe1a48223e6f6c645e3d47b3ed562112148c6cda. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/GB8KE2057092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe00c44416ce031d953fb1e726d1edcfa3f541ef86b4693ae089160875b8d1f6e. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GB8KE2208270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b3fb4dbd287a3bbe0c3cb1373e7376c68930c6180ba77f5dbbd560ebc73e75. 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/GB8KE1958386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb0d276a5e6b1323b4662a884c830acbe3f5149763fadff04b3aee011af5e16b. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GB8KE2206810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3cc6dd8accba262b498ac07d25611b9ab690c7bc36b03e410fd3c41a5050b17. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/UKQHJ2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d2f85adee0a1b23edb6f90fdf23ad4fccb3fb500cfa09327bb6232e83a9edf3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBCJY2300400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d2f85adee0a1b23edb6f90fdf23ad4fccb3fb500cfa09327bb6232e83a9edf3. 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/GBCJY2300400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c2b8d5e954a7f58e0b5c735e0470e0c6154f3cbe1a82cfb0bc20b6051f7ef45. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GB8KE2303559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x981f82a2f922a2ecad85621579540b36da17384741841bd7a2021a2bc3d687c2. 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/UKWKR2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa07ac6a8e79315a6ece7c858b29846c5da8c1be230fb31ccb5c7866eda14f083. 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/GB8KE2323424.