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 0x1c23430fea633d25355a17c3ba855c3e50a7dd2d0c0e708e66619b323c41f25d. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4f0a0b9a-32e5-4a01-b036-3cff1530c9c3.json and https://artists.proofprofile.net/proofs/artist/4f0a0b9a-32e5-4a01-b036-3cff1530c9c3.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 0x05ba867f6a08184df0de4c11fda5878bbc82a11cd84b2f13cd7bdb3cc305c3bc. 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/USUYG1166825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x217f74b2e2e6820eec65c1aeb0438df3ff122718eb6988bbdafe159713f8baa6. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USUYG1166829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15fc93b31471c633b9a87cd57f23996e929275b577465b5bb7631b766b055d26. 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/QZDA72079192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91d617428f7624b137eb1c980f64bf68e93f170af50f47b50ed4ba3294e558d0. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZDA62529425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee8959281d4cf35e5ace0007465c752bc0df6dc79e2dfbad8a5b88308f0f031a. 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/QZTB62441153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed9331b9dde8a8db93f89e581cbdb072c225be030981fa3e9163bd51f9275777. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZDA62529426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e61ab60dfb89e727fdf5a874f66b21fad4413b76ff7e1599764fa64ad837d9. Chain 2 (Bitcoin): anchored in block 958706 (2026-07-19T08:50:34Z), 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/QZDA62529427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x492833f11f793af6e4eeb1a475847cf897de28cd1554c80b7415c213640df7f6. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZDA62529428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5874f52663f49f6fc5c5adfc8f6e3611802f7268f3612b957646093c61a97a55. 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/QZDA62529430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9895d262c9ebd56a66d15213c58b9f362921c097c2bd0fa270601d58f74f6a7. 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/QZDA62529431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd26577aa4b43476bb9c6084c8e15d87b23b603e4d7900018d8bc7453db4424b1. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/QZDA62529432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bbc9ae713955f133b47e13c545647806000fe5a9323b4ffc25330f5f51faf99. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZDA62529433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d3c6c958fb7123631756601a296c8a6ff3583ca8d917c4f8ceded33598712e1. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZDA62529434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfecfb8f49aa49a280ad3cc6a7430b2d98b6f1bdf82213c9d1ccb7bb4df893451. 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/QZDA62529436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f6095ee36df5165ebf9db428d57a2dc855e240e9478b93d848fc5041fa2d432. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZDA62529438.