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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5fbc44bc419f24339fa1ab6609d24197610013baa47f9277fb0c155a14c137c. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/50ef9327-7551-4192-8feb-5d960e7f05ed.json and https://artists.proofprofile.net/proofs/artist/50ef9327-7551-4192-8feb-5d960e7f05ed.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14b4b1e80a5ab1735a945cdb564a5f2d1977c801725a89ad9edc447f3bfbfe3e. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/QZTBF2366879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5196f3fce475a9344bcf2f2555ca8a9ff3a17bf2e13098565b0352d428f0d143. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T21:57:28Z), 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/QZRP52461907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86f760f7ea88adab4ae255c820e289d5bec6c09eacd6ecef48406edb09c6f041. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QZRP52461908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdad168a3655a0117ac02cafce03b22b901b68d3b4de2b51165e72439b71a25c1. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QZRP52461909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29b33d4086a3a28d7b141e36043f4f87531731d6997fd56e18be732293f1043e. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZRP52461910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e2d4a56f201c54eb9740047b5883a80d3de3a7cca0049e0133a325cf4204434. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZRP52461911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x249290281bdb9de6bbef97d95a2c31964f5da01b2574c551edda55a0317cf235. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZWFL2435063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x739fc51f973d606c172e24706dc93a8d52d287ae3aac1d602c94a6cd21c7c140. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZWFL2435064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa64f8428357b21b3f8cce5cf0100959c76e4900c38147f258286e47857f6740d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZWFL2435065.
Guantanamo II (Archipiélago Bonus Track)