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 0x8dff02287e47fb158a9d18bd1fbb0ecfd50c62eee89782f70501aa357f21c658. 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/11fb86fb-bee8-4f75-969f-e45fb6fc394e.json and https://artists.proofprofile.net/proofs/artist/11fb86fb-bee8-4f75-969f-e45fb6fc394e.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 0xee68a303ece53124a319cb6de6827651db7e209d134d01af2264e3a53d47bef4. 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/QZTBF2303256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe432e11f831d51edc0e4ee1c979fa5ad6b0bcd76dd3865d8b5d67d1d19318612. 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/TCAHM2369823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd90edcaa559c4310766d51b346a3f5a637be537d975933e76d8079bb59bd2d0. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZHN82467340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b5460a64a973520e9e545caa0c782a1fc23c96dc60b24681d14228552848c10. 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/QZDA42379267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf07bf6b38309805af3e35362751fd5cdafc4f2f01be41ea2ff507772803e33fc. 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/GBKQU2388520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be49104c49c65c37bd28bf0d18e747da3c645597267ee1193e5d39b62b2c66b. 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/QZNWU2332758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b25d8c9891f1fcc91cd33fad90c6a1b2fb583380c9a4cf1e20086fa8f31b682. 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/QZMEN2331544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfebd1c8788b9762b23558a579e2104eadbe1f02beea5a3fb1d37e5e7aa6291c. 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/QZHN82442740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ef00177e4e5380b653c1a37b1349d0014823afdde2d639f529c16c9c9d08a32. 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/MGQ002015287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38639957f8c0e382a3bbfc057142fa2efb440807615f1117fcbe28729c10b259. 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/QZMEQ2473118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52f1b3b50b3271a700d7683863e93e69e50d8bfb8cb9e21f0e0ab044088fd9c4. 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/QZMEQ2473119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ab943f0a8f8e492e58283cf59611939ee6b803bfe383ae2bbfde8328cc86af0. 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/QZMEQ2473120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x969677e6f1f44f2cd3056a98da1f01c3bc51d0bf834b6d187112573a19603344. 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/QZMEQ2473121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99a37200bea65e0fb75ade2f045805d49f4bb50e7bbc16bda2fd558298f29634. 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/QZK6H2471948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9870ea44dea6a4f6ba037912269e3c85af7c3a84bd30493030e4d7524af524e. 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/QZK6J2418214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99a37200bea65e0fb75ade2f045805d49f4bb50e7bbc16bda2fd558298f29634. 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/QZK6H2471948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9870ea44dea6a4f6ba037912269e3c85af7c3a84bd30493030e4d7524af524e. 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/QZK6J2418214.