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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f34970df0806d9af3cd8543bade04e511400017c5b62291588057ecc9d5300b. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/da3c21aa-624f-4c2e-a45a-08eb754b39a0.json and https://artists.proofprofile.net/proofs/artist/da3c21aa-624f-4c2e-a45a-08eb754b39a0.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71236e3aa50c9008d8ebace18f4891031ce7e015c365bf1ae6bec4f68ad292e5. 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/USPKU2412001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd52671557ab27b364f02d7fef6a1f9127dbaf00c762f2d9cf0a3851743b057f2. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/USPKU2412002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ead65b37423e93a1229b3596c0005ed5142feb3570c0ffb0f33f05877bb3879. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/USPKU2412004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf86b8ec6c2dc9870f9a564e157a443efeb67f92fe9386aa67d875e8c8f9a92f8. 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/USPKU2412005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02cdf9dcd81ef28437162dfb678f0e0d8d43ab78f802eaa3ba254ea4e82c794b. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/USPKU2412006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3644288347409b50f7a1a146a37e531c2ebdd3ec238700a3e6e4b6ba0e28f30e. 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/USPKU2412009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e5b5f99db94c821e6beac2e85a2b2f1689c295017753822acf0638e3702090. 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/USPKU2412010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13b7993f790b2f894edaf210a45e6bf23fae481def42ebb00bae75a6e769b735. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USPKU2102008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b469a3acad0059aa6d96510474ec84a1aed1cf3b7ca41cfdbbce5e7b95090e2. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:20:00Z), 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/USPKU2412003.
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 0xfa530a4c0439411e9bd4a83e3fd04d51b478ec58e675d31709f7d57a2dc5309d. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/USPKU2412011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6a3c4f31dbd6e4d5eb6cced43f5fd67ae6512c3de3599655aa4c15e8861c83b. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USPKU2412007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4cac349564f5a30a4f47b74f46201cbeeeb2a2ba79cd549ee8202211035ed74. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/USPKU2412008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0d6420e3d25eae08773d7df6fdd2385ecc927dbef2837d41ecacf82212d5665. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/USPKU2102001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ce18d6a3f87f79a4fb1aa1786f2e3b71405307c537edf842fd5e247a2327d48. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/USPKU2102002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0be1295ebad662b953a4b25daca694f0be23554533c7b6083e819a6c1cbc22df. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USPKU2102003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcca656f6cc0be64a67376ee9baada6ee85ba8699217306407fb917fd623bb9f7. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USPKU2102004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48e463808d945f8c9df24bb64deada1d06880b6ba41ab5401d87a34d7f032438. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/USPKU2102006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a1127d55bfcb7b3fdd9607d70ee67618ed4a3d570ae2d5b36f7a3089e9338f5. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/USPKU2102007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa6e97805dc63a0a93e58f562b5c1d601135a765b6615a06cb36696d2da03b8a. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/USPKU2102009.