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 0x6dd8fda5c8a1d7ee59d665dd259cdfaf8af0b251eadd8c7cab6068d0bc4c6a6b. 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/bb11a58d-aa49-4dab-9ed5-bd6a9f90dc01.json and https://artists.proofprofile.net/proofs/artist/bb11a58d-aa49-4dab-9ed5-bd6a9f90dc01.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 0x7626851f44c2df6c1c08c0ff7c598d4eeb23e2ea22bc90e7889791a7a8de1fd5. 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/USQZ31508806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b3cc93df1dffa67b38277b54dafcf60d03658b1dd6d431ed7493b03f439e929. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/USQZ31610403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c6f716e487b4c4987f6f3d75668fedf81570a2f882ec250c20f6cb6c00996a1. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USQZ31711001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29d56b633b553e027ed5d681feb69247e3f3ad2fb0d162ef0bde82d0f2518d71. 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/USQZ31812102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3d0ff26bca08b1b1ae2e7ad07e118be1e4fa6f8c50c039d0b1fcb612816527c. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USQZ31812110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0b7ffdc9a8d3e3218f3d6c88c7f1b5551b154bfbbfcf11d00de8c668e3fd55b. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/QZWFH2322347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x923acba4d63b7959bcefa76fcdb5ad0d1c37a247668895fbb5ae6b0ee0ad7d00. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/QZDA72319165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9ce66bc0a1c2341a783160e8fc4538ebdea4dff403ce772bd917c71505ba9d7. 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/QZHN82255949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cae5ad85723d098e1999deed49bdb6441698f9b2050e1c576ce7a9ae4b13367. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZFZ42258713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c8ff0e15f7bb0387313ae75a0d913ac97f7295fe025b649ccbf9cceec89b6db. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QZHNC2108149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1938ee6dbd1c4ff831f744c2631653dd7c7ef4ba4e0e281837bd93fa0b1b0d41. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZMEQ2119273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0b7ffdc9a8d3e3218f3d6c88c7f1b5551b154bfbbfcf11d00de8c668e3fd55b. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZWFH2322347.