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 0xd94b5eba97fb5088d3093fd76f1ce4fc000999008e99ace60f89d7310819f838. 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/1b3c1a8f-cf32-489d-832f-5ebbea70ba82.json and https://artists.proofprofile.net/proofs/artist/1b3c1a8f-cf32-489d-832f-5ebbea70ba82.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 0xda86ecbb1b2cb8829b380461f3a9695dc57bfab9e127077a7b39e91a65bb4557. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZFYZ1915350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee53334e36b62c0d91767f2dacdb52fd129d5349953207dbe5fe8bcf894d3acb. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZFZ21901232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ef0ba211e6a6f090f9d7ba242c20148580575a557cddaee0f202f0ed280a5ac. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZHN51928875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd520a378752d081d5f447493561e817c33672c77b18e3fa322ca830f0b412c22. 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/QZK6K2112320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c167d869ad3cb93cd3289282331691e496ea3d99bea6403b5f20e067b9ad6e4. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZES62257666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf103d4a6e9d2ea8af5b31ad65515da8fdae8e241e28d9c1dbc23dcc3ec792a30. 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/QZES72251735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33c248bc15e2da2581ed0542f2864d094febdeb26a2e1aea314bd97e0f642860. 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/QZHN72255891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aab57b0f02674733fbf87ee6760a2b03b867027e27c2d3cf0e11dbb42c36e60. 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/QZHN72255892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d31be72253043f6824d9fc655f88bba7502bd0d2c10d34529d4603e820b63f. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZHN72255893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fa2833b132377f8156eb0c71ff3e77e49941f73af64d7ee737678901f5d65f7. 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/QZHN72255894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93c260f420fccc2c51a73736096483b31feed0ddb819653a0fbc68811eb470ff. 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/QZHN72255895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fdc93c8edeac418cdefaad2aed027bb36aabfbdec980d4bd834882b0f59070c. 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/QZHN72255896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2161c6610a4ca861f26008a727b6fe593babff86e857a76815f68a0277bc91c6. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZHNB2260803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f72c36e661285aa801fcb851623a631d1d54efb55e5a04b96d72d3931ba82f9. 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/NLD321900058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f72c36e661285aa801fcb851623a631d1d54efb55e5a04b96d72d3931ba82f9. 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/NLD321900058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x942ff17308ff851ef1cb6ae626c7db4169df9ee0cc45b2e708e2a4ff6370e68c. 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/NLD321900781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6bffd6c7274a317d82cc6c3ce51c991a647b9577185eff95e357ba8af2783db. 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/NLD321900782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x207a3ddea08d8d5ff325fb5fad613cf60c4b53595f51550c91641699bb3ab2c7. 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/QZK6H2266523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb356fbf5c19a3a6e14d9bdd90d4634d78c786c15ddbc0da74ad54ad673408380. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLD322300200.