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 0xf1ce98649baa50b1ccb17f603a2fd91aae16fed003d929eca216422e0458a95a. 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/56076dd0-dc88-4d87-b3d1-1059e393ed9f.json and https://artists.proofprofile.net/proofs/artist/56076dd0-dc88-4d87-b3d1-1059e393ed9f.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 0x014f348960479f8ed65662d4fef8b92b68cb0385705f71e5d4ab617b0495027d. 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/CA5KR2400868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e74348764db99605cc9adeac0ced4397a7918610b59c4e9475af8252332c3d7. 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/GBLV62128616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabed4c7593d0ecf83a5ba22c061459cb3038871fdf89cd525d86583db67d16c4. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/CA5KR0024859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad716a34932fcff5abaa24d58c49ff99c4bce8c231b49d81a26fe91bf9b99245. 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/QM7282366732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88295778b4348f4823b425e8607797bb4934632927adc9441414176a44feb6cf. 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/NLE712200682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d07016f0b5a7dc5a800fbdf21c97ac2c47b95bfbcf8bf3e602b55610c9dc031. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/QZMHL2055330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf25c194949566bd5a9e3b9a70e74f44e3d9d691c68257d5ebbe4085dc7f63175. 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/GBKQU2212108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x468cc785b93deb72eb2f76dac6b2139334dac1b7e730bcb524f0b599c345eee6. 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/NL2VN2200054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x815b654cd9414a83faa429ed62ec06177c2decda8736106efb3aa7e815cb3327. 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/GB2LD2110331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedf3e90ed33db910e3f3e935ea7af1aed307c44526d3f3c01e418ce8b0908502. 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/CA5KR2227053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40e5ceda96c400bae753a81ad91212e4c30400be4c59351f320fc70faaf0ba9b. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/TCAEY2005072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedf3e90ed33db910e3f3e935ea7af1aed307c44526d3f3c01e418ce8b0908502. 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/CA5KR2227053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabed4c7593d0ecf83a5ba22c061459cb3038871fdf89cd525d86583db67d16c4. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/CA5KR0024859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b56cc5da95853d6803a9fd3e62c8357bf48e5065d3fadd80f7ad548669a3965. 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/CA5KR2512999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x014f348960479f8ed65662d4fef8b92b68cb0385705f71e5d4ab617b0495027d. 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/CA5KR2400868.