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 0x1f134c7402f1932f90df9fcdd2da372eff8cb9592e067c32e48ea336446cb4ed. 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/7b139a4c-51d3-4ce1-a9b6-67123141cc3e.json and https://artists.proofprofile.net/proofs/artist/7b139a4c-51d3-4ce1-a9b6-67123141cc3e.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 0x82e4bdc2fbbc02bd03e8a350633bce32da5e7d97196f5344976da357b2ffb758. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/USCGJ1806040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c60997519f377fc2bcfe295095c7751165925e84345bf072c0590431ff28f85. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/USCGJ1806043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe28cf659b9bd07ffa48c56e9c9d62ed4e16d2a53b0711353d30936d3b3d94399. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/USCGJ1806045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ae373bb33a63c6507c46b5238eeaab7839b9bafbc03bea638e8553496468e5b. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/USCGJ1815293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa6ca99176a4cf55483dfc4bed048b03f93256d0afe25218c27e277fda046cee. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USCGJ1815294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c58b8e3ffd106acd584d3bfda70d3d4da5b220c7ffd360713e67ef5ef18141d. 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/USCGJ1815298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef1f8f1c5f9412efc80046a1c531d1f444149cbebdee775fd592ef5fcdf30152. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/USCGJ1815301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ab7e57dd002d5c6f193328e6ea4a9156e827d25733636787d5ac8d2213b8a9c. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/USCGJ1815304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e4201ab0bd399f078888fa73568d79ff0676c9464ddb1c45fb2db9ad36227f8. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/USDY41779754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x864a9a6cb62a46e9986a0dc9c29c968efa841b83ee097fb5d89c9e8dcd0e89e8. Chain 2 (Bitcoin): anchored in block 958573 (2026-07-18T15:49:54Z), 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/USDY41779758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x720dd7c8dd60cfbe2877c6d7c0d8197d2c8323d2ef37ca3bdd9cbd5852c9e7d5. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/USDY41779766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f25c55639fb669c4db7c42ff9ce74ce33edef68557d861d4918710375336467. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USHM82161267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aad6b8dd846cffbc7a4ed1f07bc8028d6ab7e9e8c57f6a40b712302b9a47c0f. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/USHM82161269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a153c017446ecf9027bfe49f1e2db7962030bb1ec469314202ca0601a5770bc. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/TCAHT2448129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5378434960b719efc770b7ddf47fa0510280faad87af45ce31e1bb12c56c79f3. 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/TCAHT2448176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97a32a8411f21758570b254fbb29ee49356a335cb1f9e8a51268cdc228df69cd. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/TCAIO2421503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e0e6d5fef8197abc0b894a05efe7e237d183e49f08d61ace94f1bbb7ca2eb9b. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/TCAIO2421520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29ebb548e93d0756adfbed4156f416040080d8af4e1269011f07fdbd4cc6a61c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAIP2421530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc32dbddda09a22f36490fc3133f766a39006aaf329559fafb6dc0c621b09ab8. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/TCAIP2421550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea48b9e43d1685d68df9ed720c8c402e8c8b91c6c4c2e6131fdfebbdd853a6a4. 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/TCAIO2421559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b1c809b381ffeacd5d46704f67d1e359c1a2f64c4902e8892c23e54ea0bcd1d. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/TCAIO2453893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x668143d3548431f6031231446fc9dc4cc4df3b1fef094a10d14b32815976fa85. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCAIP2453912.