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 0x52df864e885a9628a8707372a2692d5d83e2da97f4fb0a76eadcb64122526543. 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/4dc03ea9-becc-481c-9921-8c08d2905ee2.json and https://artists.proofprofile.net/proofs/artist/4dc03ea9-becc-481c-9921-8c08d2905ee2.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 0x9906b194dfe460a29fce798e819bb1d19618c655834b50dbe15c1212357be0c7. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZES61886565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x609178d8bc67acc9e0c5c99efbcbfadbabdca33456294c1fc504ad3e9b93cf22. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZEMD1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x182b9a9dc4f398a919f3b59e2e6adfe8467dd6447a2369d7629019f03a088f35. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/QZEMD1900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120d4a6d9b5cae6ed09135bea7ad16b3f9fcc0cf742fd8f4e3d6ddb5be7b5e90. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZEMD1900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa89ddd8671f98b67ed793db7db29400bf77102d5ab3d39e1401d59cbca24cc2. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZEMD1900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x508d3e731a70188f95071e5e86824363229bcac32a199a2512fc2fa265039f23. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZJG51959433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf1209108455f67ba107692d7ab6c7ae22b3cf402fdb94ab68425deea3067295. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/CH7811103002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc68af319c5c3c8d9c1993ccc4948f489cd0a7e453cf70f36a66566e96f3386ed. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZEMD2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecd1c8cd413d406172c3c58d51fa01bb8d77863058c3a5808e0056ab8f533354. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/QZRP42326998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6063bdb5b6b3785b35eba1406e311ed42f42f34135014954b45240d7bc5bc9d. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/QZK6F2497197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565218c04d8db670df7265cec278504e79bb593c539712fcd8b59f727475d952. 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/QZTAZ2447021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbb3ed3111a9365f5e1db6278c59c528cda7bafdbd023b04d748989019e2a731. 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/QZTAU2599169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e44c584f37c1b4f364bd06f308c51567d5beb748cb5e0608612099f745cadfe. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZTAU2599171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9708eb5473d5574b2a5cf02a49b815a477b7b6bf1f6b83f8f4d1cd92774110a. 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/NLRD52349057.