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 0x78eb21621b26c2a1f7d3f565f63937c66c850620e0860c4d46f1fe179be48b5c. 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/c276c582-e11d-45c1-8f46-66e5eef039e7.json and https://artists.proofprofile.net/proofs/artist/c276c582-e11d-45c1-8f46-66e5eef039e7.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 0x46ecc222963d280d39aa9fa250fe869d525fdc04404e27e3d42e7b01ee99a669. 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/QZDA62178496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd25e8ad9b91017d7b5d89dd5ca33811d335a124fbc67fca74fec80d8db94eebf. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZFZ32341835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddb5d80feece93f26745fabbd501dfa4657bf60215d3b6e75fa701e45cc06f53. 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/QZFZ32341838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd59dbf3b296565c2426acb9d2ea24d9906ca97115bca2fe7f9d98a46dbe1c4a0. 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/GBKQU2317892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dc7bbaa872abe6d2fd4ca94af5747d5b8d6db0e607d74b6f3547b1745c36a67. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/GBKQU2401998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb9b48a5c3c64f61e1823b60ba0e3bdc6a51797b0625e781b22e7d3dd4cd9c25. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/GBKQU2439888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf14738ece2d04e84f94be39ba5500f3f4b53cfa04ff64c5f4162fa77f56ab90. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/GBKQU2443592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc558a5ccb86c95fd2bcc1ad6fe044892bd16a77d2e7fe50661b93967af585914. 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/GBKQU2473298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f60cc2f131ab7480851965acaed7e73f158bcfd2ac3265c70ec560b5349e7d. 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/UKU932431679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd8b6be08e4fdbf8261532e9ebeb62753110a4cbfa312477568be9fdea197881. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QT3F22473191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0729778587f087eea7801564f87ba391b4ff065de3615ef4e3686c4c3047e521. 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/NL4AW2224904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0729778587f087eea7801564f87ba391b4ff065de3615ef4e3686c4c3047e521. 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/NL4AW2224904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf14738ece2d04e84f94be39ba5500f3f4b53cfa04ff64c5f4162fa77f56ab90. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/GBKQU2443592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81be7ad16d929b96d9c5c6c28d9235b49612d73725d8105c3c34a4d6f0230aff. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/GBKQU2456415.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ec5cfa93fa0b5c7d91107a562b45f153c5dd2fbe69a9724ed28f005f6bcaff0. 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/NL4AW2535702.