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 0x5872ac620515593e69b1332db4faa2283bd4e67502119dc83c06fdb3d0404ea6. 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/07f9b987-04f1-4a1b-ad7d-b2749f6567ed.json and https://artists.proofprofile.net/proofs/artist/07f9b987-04f1-4a1b-ad7d-b2749f6567ed.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 0xd8d40f03c5d7ea45cf1da769c79435df70207506559d1ee26ae615f26b04d90e. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/QZW9M2375176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39a4d7232d88002ee47dcbf354a454f33fa0c43f3fa2f9eb8364e8a43d70aa37. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZHZ32174383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa71e6bc8f3ccbd7518ce01c69c8555e065d3ca8a6d53e6fd6dd16a32adec586c. 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/QZTPX2110259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe466b3c76fa8ec4eae42d56cdc592be58bbe6e04e1ee0a936c8d5855bb4c0369. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USL4Q2412964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x583fcaf7455ea23fc577daa8afee06c2320897b49f501524cb7860617b17b3e2. 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/USHM22423998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0174ed139fa3289f6e35a86c52325ad3cde9e3cd5d76ae15c95a477bff29b361. 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/QZGLM2409341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x894fe9c0408e283d6ed0e61da3cfbba83bd55bfaed2fec8e89b2754b5fbb5519. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USY282306234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79f36f0ed529d64b3065c679a6e9a4d37e268b13ebd1afc0642fea9ff700cdc6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZTPX2368791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4adfe2b0c7dd45ff47f39c816b8d2cb1361c58b997938c1fb310adad90846ec3. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNJY2373138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d7f3e02d2422574865a8a661b219d8ff062b734955d15bb129dc373cd9fa964. 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/QZNJW2354216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd421202514a7f1477393b5d48ef8cb90ec16b6aa7ad1b9ac6ef4e5fc80b45ab. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZW9M2253418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2d325295e0d0565fe3e711ea70469ec47ee2a789e7b2eb1a69e6b0f850b9530. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZTVM2229712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68c00cc3c3d849437e1c5226596d6e7465f8dff8a83e5f683427d776fe2251c1. 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/QZNJZ2230959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf61562df5e077b05f5a735ccafc0716616a35ef8195d47bcc56cc13d23ae69d7. 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/QZNJX2174503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69d469767749e51fb81cb332fa43d8e125f5a1323ef7514e74d8d0268e4a6c78. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNJW2164097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc730bb5d85aa50decd5c580a9cc81c15879bdaf45f45b7d58f6bd326a29be75. 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/USHM82181348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd06f6b898ab0c9af33da9ea1499599aece6215a04090c57ac9a1310a831b671f. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/USHM22159503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9ae4630817588988f4dbd342555cbafabaf12b79476ccf44719bf947d83fc19. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZHZ62045390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecaac6028c622267e7b352533b1ef39c229ed0e96d4f7bf3635cb48b56caf701. 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/QZTBE2305711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48e5fcbb480f3e70c63fa486a7ad18b71c83a32f643f06b5d60e77782f28da1a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZNJY2115650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32e245998034c9056e31056695416987ca29fa0526866407ed40c2821a24f2b9. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USL4Q2161303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf84d2c80bb4aff13d79b2c7ac37266c1e30b09c6bc351e38f50ac0ebcf7eb46. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZHZ52130756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfed1276f1c707e2a98fd66bb9f37a22df21b5322f28597543682469c2df1df35. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USHM22115987.