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 0xc365030115f60082f6682b4651ce4c35d25b34187023d5f2ee43bdec1ebe7c70. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e82d7a1f-4cd8-4fa7-a428-c7822f3f084f.json and https://artists.proofprofile.net/proofs/artist/e82d7a1f-4cd8-4fa7-a428-c7822f3f084f.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 0x0043c258d4ae720411016411dc064f673820a09239bd6a3455318de281d8006a. 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/BCBA42200019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a31836d4f65fdebb4c6776ab867ee38148b4aa9162d9460b800caf06940d7ca. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/BXYE92000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe607f4fc7bc5dddd54e1b7a701635cf6b926cbe9324aa69fd0a1deaedf892529. 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/BCBA42200017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd8810130a6a8aeb6329c3c6d648bc7ff8fb133500e40c5f2890d48cfd530343. 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/BCMNK2100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7ab952ae79266beb7c457574282be7462ed283e9654cc2979155ba56e1885e3. 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/BCBA42000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3025c7053246b7466f5a6f8d8ce55bae0296c711c3ffdc687b8d6de69bcd3c86. 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/BCBA42000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c983f3c44243cfae8f5245a4a4eb3ff1ab96cbbba64aa359df478a8e09954c3. 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/BCBA42300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x623f8a7159bbab5ff5e99605000b79a75057c5a5b1fa75d97978298ef54743a3. 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/BCBA42500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6955a248d3e88cd072a35adddf29b1ff32100611cb56fe60dea2695c6888e94e. 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/BCBA42400032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe86a1c2cc52ffeaf3477a762020960befac7821788ab93d4329f843a19a5c063. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/BXIV82133790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c092987c9c98f079ec705e0ee108a4d03fa5fb94813e14059fc39768106f140. 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/NLY3F1800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e65df97e467f6bd43ad2a1adaede45f3b7cd426dbf67f58a5879aa310b1d611. 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/NLY3F1800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1766083a675e50b04dfb145ed9d048daca7b7e33ceaf0e858365835659fedf53. 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/NLY3F1800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dfc66cc8de20b299a52df61be337b3cdf2959b2a610aca78b46b2027372685f. 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/NLY3F1800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70b4d7576c34d96995130bcef293a011d8b7ec6a19e7888712e85f5cbde0c46f. 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/NLY3F1800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf442383fea0dda8ae2694d248152ed7b914669855a323a6386cad3c10bef66e2. 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/BRWMB2401660.