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 0xe77b2b24577c06e35aa149b7eb7aff26004a8482f684eaef0991fa52634a508d. 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/9dd7b96d-c3fa-4c2c-801e-13b5b039cd84.json and https://artists.proofprofile.net/proofs/artist/9dd7b96d-c3fa-4c2c-801e-13b5b039cd84.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 0x4bc60005d7e1d9038ba3bb2fa82f67dc96eb3727dc74ba16b60f36331bcc115e. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QMFMF2340914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf6040c00c922073d2a2abdd4a19ca4eb4ab7237beaeec883464665d6d134a92. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QMFMF2340917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x202e12c0ffd8334f2bacad135932bccdb838395702d1ea117fa44f19dec20119. 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/QMFMF2340918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0574f84c8c978769ac2a203eca60f6f36d1da816dd0c3b58fde7aa288630da22. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QMFMF2340922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55ab0a1ea1d369d44f112f3e68728b5d9bda377a8869074b91cce25ba6d986ef. 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/NL3AA2250019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3372e6a98ed5955bee6e36903dd77ce45c86f81640f9212faaf2ac7719be1b84. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NL3AA2250065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0a70d8b4c4205f8e3304648d0d3967d2fb46b65daed61ccf3c0f02643a45ed1. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NL3AA2250016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe69c4ae9a4a918aafe065400640e3966bfe57eb5ad0462e9406693559f9783d9. 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/NL3AA2250017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3086117bd1f517014fe61858fac579b7a44d87034a746ff1260b5d282bb77b3. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NL3AA2250067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7160e2c0b0271ed1710551ceaa144b882561e29afa1102fe5b061f68832a7a59. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/NL3AA2250068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadb87ae7971cde646b99dc3b00e22c64608d5c33426d5bf671fe669a64b0f3d3. 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/NL3AA2250018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb029173b3ee08f2fa12a6504c2fb76b283d035df52ac4d28925847b0c1978ee8. 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/NLSB72201651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ce9067cbbc26ced43ae6e9b1d33b6629244f01478395fe47de866d5c0578ec3. 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/QM6N22244221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaba1a5de0cae28ba686862b7931e0eb90a8f765d6727d0680d9cafa49fa476e1. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/NLSB72200769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6efcd9dbaf7a1dd2d2d53cd726639a02af053c1830b938784e69c85b28903cd0. 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/QM4TX2280668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fbcd8a6830979430fc6e03855dd29e868dbc07655a36a60c7b58fc2e6572804. 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/NLSB72200616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09a1c818e569781fd6fbfaf070dde37bc5cf1fb8744a0640cbc717c842f42984. 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/QMDA62112129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb48eb36bb0c25565853eb0f0376067ff7b55315abeea7fdc9a8c7218e8a1a415. 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/NLY3F2100044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a78798d427256e2e6940bc0ddd1550511af3781e5388d870d144382356e68ce. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/QM6N22183300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e21526a320fd7506f67085e7706c981713e3758fc07ee4dc8b8434164db588c. 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/NLY3F2100040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77f6c1deca5cac651cac8a5da1d8b52c50a25821a275dce75b2f222d1232a0e7. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/NLY3F2100041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdae966eb338e797eb4fbcb491179e14b641fe54264afaa780adecb145ee6d442. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/NLY3F1900002.