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 0xbe34bae8c5b7977e73b2c4737883ae364cb57e631df7283a9fc8faac500b2390. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7a94061a-a0c1-4b00-b2a3-1d4d47b2554c.json and https://artists.proofprofile.net/proofs/artist/7a94061a-a0c1-4b00-b2a3-1d4d47b2554c.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 0x79a05a42c8c11520e25cc0540e8772ef07aca4981189c671fe37961d35e6532b. 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/BRQC01400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x292eaf39719d3366ba6e7fa106807d251b6a44f5da74a54b59e0b88b260a3d0d. 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/BRQC01400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b82b04d2b3ddfd8616b492ccf8090d12f0c46f4b3f015097971720d3be1a88. 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/BRQC01400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60eaf0821c53d9a3a3d92645cc25dddc245e8ac806e1ce7499c557430725aaf0. 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/BRQC01400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52ba8d4d62fd2f13677fbf27a8ac43784f12da7a68af342f3b3d8a504b32ce5b. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/BRQC01400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdc658f75288d60373b150ffd464ba1d5d1554b6f453426e614e3640bbad3bb9. 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/BRQC01400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f173dfc8fa1655e9f8b782e200fc0364f0fabc070e29d1c153923a21acdf89f. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/BRQC01400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe927d5d147f6c2180b694ee9de98d549cfdd2e2250f1112c83696203caea37b. 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/BRQC01400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1789ff630671d97ee2119c804cc79a0f6a8116e5a9d1614b0487a987f242c35e. 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/BRQC01400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9cea37d69de87414789b2b60b0fe021bf3205f14cf8c38c107ff442eff5752a. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/BRQC01400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c0d6aaa41d8761487b9252c93ddef51aa6c3acbede7f3bb0bb25b00e7f736ab. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/BRQC01400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e9e885c1de687b6bc6b0b09de113614d80d63f103524017bf9251f7de8d71e9. Chain 2 (Bitcoin): anchored in block 959147 (2026-07-22T15:43:44Z), 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/BRQC01400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa691d61bb83a539236f546e866675ab20c24efacf22f8c64278535ab44103714. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/BRQC01400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fa382c5ae4534a1c9699ed64cc151498888a75bfd29c628f081c73fe721a355. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/BRQC01400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80302d389bc49ae63abaa01c8930552db2981b4571d384487be43594bc7217f2. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/BRQC01400015.