upright=1.35|thumb|Map indicating travels of first Scandinavians upright=1.35|thumb|Norsemen landing in Iceland (9th century) __NOTOC__ Year 815 (DCCCXV) was a common year starting on Monday of the Ju
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cee29ba40211835d9711a7dcf0ce4359614d4debecc545b244a027d655a01f7. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9082e342-9554-4a10-87ec-0a231a67c5b4.json and https://artists.proofprofile.net/proofs/artist/9082e342-9554-4a10-87ec-0a231a67c5b4.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8b3992ad34e63fcee9fe7b65ceb14316e16b41c33a7170631781c376c6a59a8. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZTB42318466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee47438e1ba850195de066de7198ead5b1d5b98fbc138e79c223ed2b66166594. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZFZ72429548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x989f6c69f7dfb24634b17594339fe4544e330e8542d4d11eacec17678fd6f93e. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZWFR2403302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69a770941ccf7406e3c5b3d2b4b4ede14afb5af6ba42a905c176fe2272390703. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZWFR2403305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ea418d08c9b58e4a1acde91b813676e943ae423b6915a05651d0baec5ff0a49. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZES72533713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17c7e035a40bd4d5159c53c7d9669806c798d0e12f4e29d935ed73abe1b94d70. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZHN62501682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36d65609a399872b1b0580158d8eb429be8e7dcfe53ad418c62a1adc4930d650. Chain 2 (Bitcoin): anchored in block 958635 (2026-07-19T00:58:42Z), 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/QZHNA2534295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7fc2a02bcca65e55466760b4610a5d226c4081d8c351fc622192adebb58ff5f. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZHNC2552853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cb4531bc153dde64d8a54ff5aaa91f830d9934f1be897a784c054ea8ee312a6. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZMEM2564103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec31bef469caea9583e0485fccc0e6975eec5a48bc106fd3af71fadfdd7de938. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T10:48:40Z), 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/QM8DG2543597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c08eb8d57f6ce3992a2697a398f26e907a0f659dee366ffa6459fd3050bfb54. 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/QZWFL2507567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11f6555d405cdac03cdb9f4ffaa2677134e1496d5390b262b5d33b006aba2765. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZFYX2380625.