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 0x1668d89d5d0ca9cc31fc47c2ab505cb9a36831bc58ef395f804d1d27ae4c1924. 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/66ca8c05-64fc-46f2-83ce-ef9722a13ad6.json and https://artists.proofprofile.net/proofs/artist/66ca8c05-64fc-46f2-83ce-ef9722a13ad6.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 0xaee272f77333ddf6b92fbea7c1609cd3c57f48c5224d63c6a7946ab0fde3d85e. 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/ES5591500347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff6bf6ba78ab146cd8e4e48566e53e6ef4e1c1b7830053179beacc283c250bb. 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/ES5591500348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1929f23a765a2bc5c81a574b739a65ce61d0311ba6f9cd4cd8b5452403003592. 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/ES5591500351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bc6959b2705a8cd34b845fe5455c2f98943bb8fec23c586e394871b2380dc2f. 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/ES5591500356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x853d27b3512d3c8e859008d4a9ec933aa0ae812620fd2caa4381e9714fe01a23. 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/ES5591100024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec428c368ea742bcaa70e930ddf7be143e8dd1b2c9e5b8883e50464e5390fb67. 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/ES5591100027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf41cda18a8f639b7141ccb4e2d3af6292054a0948a1d250ea67c996691a903a8. 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/ES5591100033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b1f0c9e60718dbedafb3b2778e6cbba60f9de02124a970516954a74539fe1f3. 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/ES5590700000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc64471990baf4ed4c98f732b0d5aecc2dde4684ecba078ee5827a4e6d703cbd8. 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/ES5590700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x303cd83434385248a296d1cd26a621959ab2e954224c3e25a5c5b82ccfa3d310. 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/ES5590700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b218910f6c58d79cfc8777ac76b5c1e86a45b97a9366941a212d73f41ce7d74. 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/ES5590700004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5b7e2591acdabc168cd5f65a8003d0a5aacac2e09ef2ccf394c70d2475ef11d. 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/ES5590700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fba9e3951329ad521e659f7a09f7b75d6d99d2a078cb77ed51e0a64b3f1d6e0. 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/ES5590700007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde3aedfe4ca469c9f834cc0feadbd80dc3919b3917968be580d6ad64e415fca1. 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/ES5590700009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c615ec3b42bb3ca61b0361c4f578ed7058f9575e6f4a72d46fd5a2a796f96c2. 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/ES5590700273.