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 0x6483964e97a456bc61cf6b8f36afcff53c6ceacee5961e51912b223ae16f2781. 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/49bd30fc-5a95-4120-8df0-60dd50a4d1cf.json and https://artists.proofprofile.net/proofs/artist/49bd30fc-5a95-4120-8df0-60dd50a4d1cf.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 0x9120b79ed5b154d26c78da58c8ed7cade295cc0ab71d3c50ca9117b8658319bb. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZHNA2299850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91822763edf1e4b1ff20ee2fd633652ea329ff74a582e1676bd1eb4d72d86d26. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/QZHNB2201250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x768fde558597ccf36ac94365b2a8e74d2ca85bea23c8a47b2f9632388ead2778. 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/QZHNB2223363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84214c9733bef7084b01a29bee15f88250e94bda92b2dc0be574eccc568c033b. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZHN82281396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d89213d98b71281e7c4583bfc29f9f8047b94d457e01f5e70a452cba4cb66e. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZHNB2241924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b2eb9ee02deb36050d867260f260e055de663539293544c2bab0bfdd3b3f02c. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/QZHNB2243266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x613e7ce104fafafaa7ae2949688edfd2320f90f414644c498f5f0d41b3c0f0ac. 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/QZHNB2225371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x619deb9864e2483c1a8718d4cc05f19561b456fa2e018e42ca9dd09bb4182bce. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZHNB2243265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48f00a2cc7326d44679c6b709716ab509890a8411585ff994adda522112cb608. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZHNB2201251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa303f71980b1430d9d4d8f0cbe19cdf278c962c215cd491fa0cae4dccd10a4f9. 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/QZTBC2443312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe68c647470c66334af2f1972ef4a3da34947c982f7f8d95fc53f2037470a5cd7. 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/QZTB72496910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6940b3a628a6fce935cdea556d6c554df1b97000ae409251f468dd9b72d5f643. 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/QZTBC2443313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d31172b0abe86306fafea4cf407a451881488d3785739908a39e271270ffb23. 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/QZTBC2443314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a284430b7529b9536c707d0a53c0fb07312da3c90201fb20bf8addfc3dcf35a. 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/ESA082400421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb34e63f5186aa8d59601edb8c5f15f7d9cec4210de76998571858418dd12e1d8. 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/QZTBC2443315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a284430b7529b9536c707d0a53c0fb07312da3c90201fb20bf8addfc3dcf35a. 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/ESA082400421.