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 0xb055f2afec4b47dd4d99f3dc549292f185e4889228eb5d25e1695da04772da7b. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/58999ecc-efae-4918-ad2d-7e204e78a63f.json and https://artists.proofprofile.net/proofs/artist/58999ecc-efae-4918-ad2d-7e204e78a63f.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 0x945fcf8df48efe3aa855d737f4dfbd18485118411e51f8e240cfc90fe9257f8c. 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/QM4TW2027099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66076ca8cef5a2f979abdd95418b6581f3225843a2f21cad6599eff3f3e65fa7. 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/QM4TW2027100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf7fc437cb367d88869df7f5444d8e4935e508e01f333da017b51e1c9ada2ad6. 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/QM4TW2027101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc564b5e94420a1c4a1b94b41ebcc125e97bc6cf5290a786f84f641ef1a4cee. 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/QM4TW2027102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09e25cdddb5a8d63f0374fec6379d90b76c0ad064b12130cb83d7fbbccc2f094. 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/QM4TW2027103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe44e42cf16d365597f9cc7d3701d42c2f5bd0eced5c7b8e9d705e58a3f4f9e8e. 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/QM4TW2027104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6b342ec49e705603fb8b4ec0e989ed403652bfe0d583e3c8991cbd27b1cfef5. 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/QM4TW2027105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef952aabf3aabf64c4ad19f85bce1d840f634773f81a79fc9a8ff044a06f3c03. 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/QM4TW2027106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba63381455948d45b52bb419ba78b0502a7cd6d216a38aba8c38488fb0ce0ee0. 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/QM4TW2027107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63904faeaff91a68cbff5891ad622fe583740adc87b65ec0213d17a23cec8903. 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/QM4TW2027108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a0f435ecf3dbe7f90fbbee3f853e9608fe5b99ea81a822b72f5d4f13ba9cd67. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QM4TW2027109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcb1b69aad961ff91bfc59df872b3ce240af0fc2266cc4d88d3caca6acc4a8a4. 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/QM4TW2027110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8edbcc8c922ae22ccb43ac7e78e988254d42838b412cbf40565109b2cf854c6. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QM4TW2027111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b38f4a95848c06fd02f91a9b5f0b298a63d4121815c944711e98df7d89ddf70. 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/QM6N21921067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6668fa106f565fad49cfdd39c1d8f8f88ab660b23faff4327de36e9fdd4baf8. Chain 2 (Bitcoin): anchored in block 960101 (2026-07-29T11:46:30Z), 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/QM6N21921068.