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 0x85b5a8aa93f9d73c845fbe4b21a17f9ae42cb5ad84f3d66190f826cfd1f126d1. 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/b32dd2a6-4a54-4940-be58-04abf2b726db.json and https://artists.proofprofile.net/proofs/artist/b32dd2a6-4a54-4940-be58-04abf2b726db.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 0xcf60785888e3caf336a1f0e7c27c63b5d4cbb61a2e2d28d10bb18cba6843d378. Chain 2 (Bitcoin): anchored in block 958303 (2026-07-16T16:39:24Z), 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/QZTBE2440412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7bf8142cd0c95d7d17e9cf8b7477ffe27cd5f92f39ebdd29002ba18c8daa405. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZTBE2440413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d32193a710cacd558dede7edea41c11f4f346ef5d3a2ef17037be5517e9f048. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZTBE2440414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d5a98b02d01fb5c5e9de3fd1c93f0817da139ea3e61ce387315389a92beed5a. Chain 2 (Bitcoin): anchored in block 958668 (2026-07-19T05:16:11Z), 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/QZTBE2440415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x079221e9307917f662d302088eb46b6a43af5d9147b7cf92296328c0b0cbe778. 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/QZTBE2440418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd31db0ecc30faa8320a88bc0862a0dc44c4e305f37cd7acbb0e69ec57bcd9429. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZTBE2440419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3f02ed5b75e736e4aa9a991140c59326d1798131703f15ccc2d47d49d8774e9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZWFP2451826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9c75b5d1fe4963ca96cb4afb9ba6b0e3a50f963d9592ee9acb89eef59e1de01. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZGLM2589768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a95ff037be237297051764e60d4b5425aabb0455b87060d022c7ae8f542ae02. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZGLM2598791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70885ad68a2fc486272e8641a6ad2befaa6c1eefc9ff14a0352fadccccf3caeb. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZGLM2598794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b659ed9202be23866b5ae1850dcebf15a1fcb91f8e5e3be9e4988e8b722301c. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/QZGLM2598796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39e7203bcacade79e80b200c367b9dd90523da6ad0ffe4a393f32a06aa5e5bae. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZGLM2598798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b33e4053b043a8382eb1699bdbcb0b075cb0af646a7c595eacf7bf3e8e3d72. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMFME2355190.