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 0xcc52fa97cd6dbc9ece360a23d11a04d78590af41342cc0d7547a29b4f2651f9a. 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/f092dffb-7c02-472f-8946-cf8386d8a642.json and https://artists.proofprofile.net/proofs/artist/f092dffb-7c02-472f-8946-cf8386d8a642.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 0x55a6bd15554f74c36fdab5eed7c6c8489476c7fd2aebba18d8cc47ae5c4d1539. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-07T20:41:57Z), 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/ZBU4P2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3e8256fcc93da21514691618ad51ee092fbf8bf7440f8513340eb5c60fb71d6. 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/ZBU4P2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25c570e0bd946a9fac89ff20f8890165b6a1a808350a4fd67f966345a1d98978. 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/ZBU4P2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xace7f0f536343f8c234d22576b7b15839c9463fae40eb923a32ce734690ce507. 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/ZBU4P2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf93fe881f90df0181d5811c620ff70c4901ecb46d42c490e6f12c81bc2f11366. 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/ZBU4P2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28fb272e1818b8626c4ad11c377d7c40f81b462de4ad6b4ab8b9e5db328b6a3f. 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/ZBU4P2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3434ad093bff964434bccb147d982bc32c197e41eb45c8f58cd15f0ba5f2d200. 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/ZBU4P2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x055d178323750e220497de60a109484907d183ca5082b04cb36316f8043b81c6. 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/ZBU4P2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc723e359d048fa990f562eb95cb7dffc7edf440d8c4683aed195efcf28e0c6d9. 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/ZBU4P2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aaa5198b5383b78eba0f01c9f85ebd5ddbc6b4401c79bef8022b9f1184fb46a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ZBU4P2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc85b47cf6caec59e610e55fd34e57156d5bc59d275a6411b7c98f7dd2289e4b8. 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/ZBU4P2400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38ff4c601a8be8eac2e9e095d3259cf3935b66b668ab278d33d20907afb4539d. 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/ZBU4P2400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc88ccb7da8c2f61efa253e3da5dd84aafaa9f4d9fe265745b39c397147be1355. 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/ZBU4P2400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c711895afc9aa5691b59159d4b13b1563db223f2f0f87a142bb6c33f8baaf1c. 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/ZBU4P2400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe17729862a44a9afd56ec73772eb96b27fc23f49c5e936228dd144d8e31de1bb. 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/ZBU4P2400015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe64b6c5d2e67511e278a3daa9e8f76e9086d715ae9be7725ef301b59238bdb21. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/ZBU4P2400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2de56a5e89deb84036e514ef5dd3a8e466eaf8667de17de7356aac0cc64787b2. 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/QZYFZ2475476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40f29196f6d6c2c074d70ee068eab83cbc8c6cdeaa58c621e5d75120410f10e5. 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/ZAC012300686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53af28496a4b232006aa407e18bcbb3f4eb1a802482b9d68edef8976effacf6a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GX38U2245345.