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 0xaa1bcb9d87d6f5b1562251ab7b6a88c7022b4ddd7ee580511b61acca1b96fd8b. 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/8d40e92e-25c4-4921-b5cb-b6f190a9ad34.json and https://artists.proofprofile.net/proofs/artist/8d40e92e-25c4-4921-b5cb-b6f190a9ad34.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 0xfefcbb948bddc58932bb931403f1cdbb7f50cc20ba71bfedb32464f96562d88c. 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/NLRD52332927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4598f9e9e2ac7904f9cc2c5c790c4b53849b05bbd3033dbcd69af250c5d7d998. 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/NLRD52304353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x410ed1616a0716156cbf53ec57e8c6d17a55a7aa5b4862ffabc3f79484b983b0. 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/NLRD52119680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x018d81a208abdfaf09f16a11ba57daa59d4a66d339bfa2464d61050617f3becd. 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/US83Z2205543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fdca7ce630f27de35e46c49f6ebf30616d3a81c07c7eaf7a11d35ce410eceab. 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/DEGA22003228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7ae709763938f0cec503035052788458567a51c42601e46a00b607a1e3effee. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/BKRAP2400018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeccbc947f0fab48cbf4ce6a2d6fe9ecd57fb692debc40f8dcd1e194ef5287771. 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/BKRAP2400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f9741c909724e971f947a49d511b500422d8374faa6dfd1ef71cf3fb81bc1f0. 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/BKRAP2400020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa01264b5f94bf97da787d8732508201c2e288af9d5aba42b73aa9f809613bfaf. 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/NLRD52303962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9cc74e843357ce69b80ce9d0b2e54a540220ca3a62c7a0748ec58781de70bd0. 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/BKRAP2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98c45dba178aae874c177935d8def812d6e326519e5957fa11945e05529d8c12. 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/DEKC42300029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d79e564c2f634fdd3907bfe92e74da6f6b990ce8c9f4105065ecd8ff1590773. 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/NLRD52119692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaabc83e9bf477d3ccd8cb909ca777ddfd5ee012c7d37d3ecd3ab2bb4e620552. 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/DEKC42200051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ee7ee9585a695d28f88003eb9740df24ea848b470b94ae70d663b7b2b4a1290. 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/NLRD52119500.