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 0xbc1443828353ad217c95adfc75c5c4e0a471d6c008f73e28982cf5a6efe8aa1d. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d5dcf4f2-b27e-4ceb-985b-0341b438000e.json and https://artists.proofprofile.net/proofs/artist/d5dcf4f2-b27e-4ceb-985b-0341b438000e.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 0x2399b4ab0c6e962a5a082763aa3875b2f2d0619a1a6c63042daec067d496ae19. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/USLD91722097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd224152940b5d45af9785839186d0458800eb4684d5bab3bfe7209f07068f7ce. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USLD91722094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee00472cd4cee10a06039ac0b819a00c0968adc5d6048d6262adf5206c27598e. 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/USLD91730044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4bcbaf3a832ad8226e029d2416c90b98d5fa507bf55def4a805d55d20cb01eb. 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/TLREW2220664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae98aff7e8d018a8cfed51dcc307129b7a2bd317e8163ecff336c5428f51078c. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TLREW2220660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd747e058f686547e3dda05508d34b54e4338bcb26b9d27c6fea2503c3c670e29. 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/QZAKB2133196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea627dacd8c4208e4fb0fd61bb768565a1f057286bcb0f0ca6d25693fe17cc53. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/CH7812221764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86864be3a33de152d46ca297509ffaa1e2900ee5b51dcd0d9c44f57a81d3b718. 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/CH7812225664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x178f2b378a1dac240d654554d7e393ebd1946f9245b84ab00c7251bc267c9e1e. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/QZVEM2322840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8efb2852a379d7ff7e0ab224453eea2644e0e69205adfdedcfc40bcf1604d31a. 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/TLREW2232654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d6839525a49bdf7aeeb0faa54d44697bce81f4a61c1724014cd4b4b40935beb. 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/QM24S2305493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d6839525a49bdf7aeeb0faa54d44697bce81f4a61c1724014cd4b4b40935beb. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QM24S2305493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd159884b9eb1060f7f0c11adad982ba1e7525fa8668b9d2b65071a5540f3dc89. 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/USLD91765481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x075e38b32086ef74388422e9fd44a7ef50ee46129fa35c5f96c53f7d8fa49c5f. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/USLD91765780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5277fc2274602f251eba8b7e3b39549dda56036b9399da0482cc3e103f8f604c. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/USLD91765782.