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 0xfba236039f6121e7fba4f6e79a572afde18961de08d087cf0123a4b592e7c05a. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/85ef3732-946c-4874-803a-c0824501243c.json and https://artists.proofprofile.net/proofs/artist/85ef3732-946c-4874-803a-c0824501243c.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 0xadd8df9f160000e2137fee054f4193060a7caf69a32fd2a6b9ee3a1b182f2b1b. 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/QZDA51962267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc00c71ad69b55c165338da559063549d6745dd9168896e84b31896e9f59e29. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZDA51962279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f2df0cc1a9d99f293ec10c2308ebcb84b848ccc5506dea117d3ccc7a0515dc7. 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/DEQ021904129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73d7ea249aa2fc0396d54d742ca37c5d7730b5ee83c567da32074de98da95104. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEQ021904131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dad1a10f7580d9517195e4e6de2e82f6c3bec1011539c983d2e2457e2af420c. 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/DEQ021904132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7058d7c3739786c5d5f7b855df22d87608530f003c9a42572c133578abcc6088. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/DEQ021904133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fcc4c6c694537312cdaf5cf4532ff6dc416aece67a51917b40557268c6e1018. 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/DEQ021904136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48a50cd260135767644fd7a563910fbfc669f7c65ec421aaccd18be5ba07656c. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/DEQ021904141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7f85cfd83518621e7041052d2efdfded2e7afbde713d79aa0554efd625aa46. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/DEQ021904144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadd8df9f160000e2137fee054f4193060a7caf69a32fd2a6b9ee3a1b182f2b1b. 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/QZDA51962267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb02c7b1d7e1f5370b5697034a94dc84b58b446312616a455ae3590703eafa8a9. 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/QZFYX2387084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x407d6b0caad374a15e29ad5bbcdb5df48603c2438b3e82be644e60328e2dbb20. 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/NZPB12203956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x705e91d5d96265285e677ab58d12ffdf073686c215b474c4c7250336a730dd3f. 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/USY252313170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x971b1f638ff98ccd3d115600d4d41916a5ee9a541909010fea61000149e2bf90. 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/USY252313171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20ecf146d919334a29a50e2852773cab2e7b3fae39aefddf2fbe7a76dcd712f4. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USY252313175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6f09a6affce23916974db3fbe97f4daa6f496cbcb7b6a19c2dfcb2de1e86f9b. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZK6L2503290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc82177e878fbf9ebbb731f984c4e7524cadc92f6cf79dfde27b6529411994fe2. 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/QZK6G2504575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3da63299b8709848c54d99b15af1c3e0d2c1514b933de84c0145b5b51fa52eea. 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/QT3F82528579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8ba1be9ce81286d2d0c6e422da9b24f70ead6560b1dc0642951494d94d1ced6. 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/QZFYW1905494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x549743acba6b4a10bfff483efc7b518c91f24767fbddd1d281f20a71698164fe. 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/FRX762135907.