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 0xdd60b5518fc25e6b8a8f12a00e0ca94697473235739599d9669c019aa0632d2f. Chain 2 (Bitcoin): anchored in block 953765 (2026-06-15T08:55:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bd844a96-a701-42f9-833e-612d6cef2d05.json and https://artists.proofprofile.net/proofs/artist/bd844a96-a701-42f9-833e-612d6cef2d05.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 0x5b1cf7e32a23cabe6fd8aef2b02202dcc85ad706ab3a69b978229f4acdec6187. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZ5AB2382648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb79cede2d1625428eb7504eee2d114e9118bc9d7048a22cea9ee68c9d25e01cf. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZMZ92470661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8cf1082e84ef9c19894cdbc310b73c67cb7722543c898d9580bc4d3655ae607. 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/QZNJW2436094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90e067338c49aafb219e38028f33c2553bf557f7248d4a1a375744bb3e09ad6a. 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/QZNJV2498805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50e0a832ed9ca6aa4bdb0b418d4cefd61f88f4794e3d512fd878f28af2c400c2. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZ5AB2445612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5f0adc9187fdf143ae2abd143c78662cac9ecb669b82f1e34600cf26466a48c. 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/QZHZ62145636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89eb7e2de93e5f038d06da3091888f5ffce1192e6dd943f82b665ca915804de2. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NGA602000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x499613820d5d6ac918cb39f524631e6196823e565965a090f70c2e19b4155d2b. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZMZ92472552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd681b8a3575993d8c4d18e106a858149c4ea1f0bfa44acce21222d0ec84a31f3. 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/QZMZ92453465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb3d1d978f6c077531956873f451d66ae6a2cf93929d169ba6839acb00729540. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZW9L2397454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd10e482e43f60d43d69bb83668f10316377e740146c87504f1963c670e722424. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZNJZ2300191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ac0c67cf21b6cd2f28fbb30454c7c2237ea1d75cb2332d526489e1ea37ddae0. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZNJY2317074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd73e9fa3a2cc918ed310de6366e4b2ae754d0a5a57545a4eef537326bad92306. 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/QZNJY2343939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9529a24183028d48f3ce1dfc89748d6215ed740cc174f2a760760d797b0cea3f. 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/QZMZ92365315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x803f469ec292331dced15434ab9859b4569a9d21fd8ce2a374911a70fe306f25. 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/QZS7J2278251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc283abf65d07c3f26c9c6f686e9acc328c049a99a99bf521e0b00dd36bb42dfd. 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/QZW9K2224653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x330460a539aa494beeba651fba046624870dd81bf398a6bd88840916b532065c. 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/QZTPX2258835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eecb2366dfd70aec10d1dc82db38355a485f3eb329e3de01b9a477674d1d156. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZHZ32296238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdf5e96eefcb30f35d415d203077968b441d761d9455031851231f139a6ad94a. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZGLM2291263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49348a153dfec34377f2db0c8df8fea71bc07777dc025c140165791e2a0ccdbf. 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/QZNJY2122184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4da238195da1010fcbc464d9ac538abb714c8f72013c763ad42c50328d5cc0d1. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/QZHZ52066039.