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 0x0f35e9f402b37cdbeb96257700a6e39f269c0ec1d8bd694235f05de3b049f210. 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/9c2c7f91-f35f-4029-9f6c-c0ba98cfb322.json and https://artists.proofprofile.net/proofs/artist/9c2c7f91-f35f-4029-9f6c-c0ba98cfb322.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 0x51c662dbbf295997050af845ae26134b531d3adfbf7ddc67e440a1890770cbdc. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZWFE2341520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaecf6af29656b633f7095bf42489a8265cf400674999aab41c1d029d3eb902ed. 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/QZWFS2305970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51c662dbbf295997050af845ae26134b531d3adfbf7ddc67e440a1890770cbdc. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T15:58:43Z), 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/QZWFE2341520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x240d0a6721e135297bb25f5601fbc3cd867859a5b715f98022ab083b967e2068. 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/QZDA42460406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaecf6af29656b633f7095bf42489a8265cf400674999aab41c1d029d3eb902ed. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T04:10:50Z), 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/QZWFS2305970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9546b578e9cf7048af7d1dc8e1128ef6d736e790e5a398a4a01c91a2a85e9f5. 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/QZHN52466827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a3ab3d66a363353ea793417d69ba3814aae794c4211c2bd2375375965d344c6. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T19:06:39Z), 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/QZHN52466828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab94b2e9df7da4c75b3f9689b98698d859ced1c7e348308602856f3520eccdcb. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZK6L2475193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x304f2c747f2a06b2f13d76fc17d459477dd55f2ca34ec9bc6aaf9f89c50240d7. 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/QZMEQ2488389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9935dbe9427e1b65e49e75f6c81076014bc4779957688716907d4d6129fe47c9. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZTAZ2483197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cd5d35c7cdc0c36204d692e24e37749049ff2a59e67ea57a5086dd1edc73042. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:34:19Z), 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/QZTBD2444966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29e99d6dccaf495ff3fde5bd220f31a60086a4f874b13571a8f5d2c1d66f6b65. 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/QT3F22494833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b594056a038127a478f6e8d1f1938aee47a9404edaccff2c7ab41c7428486ab. 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/QZK6L2542374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46383608a58d212052df51c2cdba7ee9cf05085862d69592b411e0633b49dd71. 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/QZNWT2581123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dbe4fc07c5e51a119d7919a55f97dde7c6228b0b702b6f57be658c201e45ffd. 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/QZTAU2502861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e0bb90281c969cb15ca0e76bb75f26388ec2ec8c9d460f71e2c4767a2f5c65. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZWFQ2502074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecf837068d618c1a87dd3a1840cdbaada6eca361d31a4cef9cb94a71c8932638. 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/QZZ7V2550744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03a76b940b1b90ddb28a4028efb97d4534a4ea2cc1101f36a914dde48f81f02a. 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/QT3F72537733.