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 0x1bb407543d81655487822d0d2f5700f71dc2653cddcfa8dae3109396819b9137. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6f23c451-179b-46a7-b0c2-569c7abf631c.json and https://artists.proofprofile.net/proofs/artist/6f23c451-179b-46a7-b0c2-569c7abf631c.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 0x7e40065a585b88a3ce2f6a785bb7c4ee7985be6cfdbb663a84c20cd6bf75b851. 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/NLRD52355111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3e815e98d1da9d12dcee1aee954f45a45c25d2a10b8655c2aa27cc0450b1934. 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/NLRD52355112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c23d2c011127d506a9d8140f82c7639b644d624d5963339ea33604e22ceb9d7. 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/NLCK42238636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaceddf471c4b15c6ef85cc40fda8bc79f6bc968a502f44d63d702f1215e2fbf5. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLUW22201830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf9d4d02fb3e4e56ea8aed205c610a743cd3f0f3fdbe7777ead6ebc6fbafa3d4. 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/NL3M12412398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31cde5d26969e2d89b99a9be123d7918487e9d391465c17a4c9fe66b274d7535. 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/NLCK42341168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa84e09e495e97f626913bcd7d35031681d0b7b641c10ea763527176486c857b7. 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/NLCK42341169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc82f50cab714f0ef9fedb62136dd3375ef121aa635fab8f3577597630590a5f3. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/NLCK42340510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x403148545fc8ca6d49ddbd6495956e66e17ebfffa64c67745fa2baef1631604b. 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/NLCK42340369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba6309a9ab22a1b6d73c44fad768899113e3651c810c4b5be123da609084debc. 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/NLCK42237076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa873e6a8cd25e469e9d2ccf22242f34fd64882df775bfd4bb430d86f8b90295a. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/NLCK42237867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c23d2c011127d506a9d8140f82c7639b644d624d5963339ea33604e22ceb9d7. 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/NLCK42238636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8966e4aeffac52ce84f41518502a6968010774713e808a54dee8536b726330f. 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/NLCK42238331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5892b8281a9ef42051658d69e919355c5207a1d427ccb504367a4902dd8550e2. 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/NL3M12412390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c8694cb2f1053b2f7eacb19c90671d5d0882c9bdd1030c37f51b25020911bf3. 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/NL3M12412442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc25f6934de6b2d73171113a9ec180aa3bccba3844cab32934adbd8b63a72469e. 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/NL3M12412454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb3c471fed028cb4c2379cf20b77e1508791f4819b694dda4152bdf24560ec87. 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/NL3M12412485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fcdcad6e52f7b6a1fc87bca029c8f01daba65fc989a371be91dc865dc971f2a. 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/NL3M12412411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf9d4d02fb3e4e56ea8aed205c610a743cd3f0f3fdbe7777ead6ebc6fbafa3d4. 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/NL3M12412398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x586dbaf4a917134bd7f0af272cf647fd1c3fc5855b99da2e0092b93e6364c9c6. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/NL3M12412496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3a515bbe31b7eadae70081b5d9f7725f5909455856e3c3bacc4c2645b94eebb. 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/NL3M12412425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9f19a690195c5315e6b003b15156f13458f01e2d2e644c85b32103426d12aca. 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/NL3M12412465.