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 0x4ec7865eebad71263716703efb0284806278b26df74599ba26d85a2a3ac4ad13. Chain 2 (Bitcoin): anchored in block 953701 (2026-06-14T22:16:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/75794a0d-5241-4603-a409-d79129d60f52.json and https://artists.proofprofile.net/proofs/artist/75794a0d-5241-4603-a409-d79129d60f52.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 0xd17028762e7ef4e064683c7cbf6eacd5fcd6abe9fe48b8f54681b551ed1c6434. 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/NLCK41058648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4a8210a7df8ba4fc75051704c3b433cc070fd7aab49ee93e1695aa16fdaa616. 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/NLCK41058649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x978c19d00828df3549b17cceda27bef947960d1f03e143d0e26af3186a57449b. 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/NLCK42235632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeb8bbe0e630982580f42b17f37cf8d0a099d0b1c25a1bd28e7769f0c5e4684c. 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/NLCK42235633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17e040e8db2d7c8489949f719fee8e8c08d35129f80343db3e82a17e84da0010. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-21T16:54:40Z), 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/NLCK42235635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bbc4763bac748e6edf07fe864a514ed0aa83499e4ec4fcfe428821a97d65dc2. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T09:05:47Z), 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/NLCK42235636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa39faf1f60846c5498b42a67255717c9e250412a591aba1e70c3aad1e269d92c. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/NLCK42219574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf497392ffde3e260becfa09e62cd76311cb70fe930642abbcdf062ee37963bf7. 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/NLCK42215676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6d7dc97a84ecf2c485820cb2a7fcbef6ff4b826747097bd060c3c9e758a1b11. 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/GB8KE2209228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4592404b4a79057909fa47911f3e141dec7df9d8a93ff9344370fae8151833d. 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/NLCK42217039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c980ab173d0abcf16c12bba4d924c3968dcb2c1626fa4ca954b6e8f7deaf7ea. 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/NLCK41054504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b55774bf0d206617820db1328ff19939d7aafaae37925d44a1cd65a828a06ff. 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/QZHN52290259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa03183c38fd5a63429ef7c1f95143b15e4aaef6958cda96ccae83c4e029c5ba4. 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/NLCK42405927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83b9b6bf3ab6e92af7cebe3967192d21a97cf131f9951609dc53e21c280b5125. 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/NLCK42405929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10520efebb2ba650e9f872e00a862dda37b8d706c8bc3fec5cdc29d6c6555e8c. 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/GBCJY1800042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aff8f14742489d2f8ab148467cad8a44b404cca6a5ac66af76bc85ae8e7b005. 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/GB6TC2075016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60c4245de05e1527e8f896d926f55f8b05185865a3c94fd58a10f20308bda7e1. 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/NLCK41085179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ae570f92b3739f43a03f62687a8b3abfab8b8eff8b473ab033d01256c14d98d. 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/GBCJY2000124.