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 0x4d2af47ae0e38b111b877612e1f3ef1ba05aa88f8041180143c7ba7ea52d266f. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5f81060f-9aa4-4b10-ad28-15186689212f.json and https://artists.proofprofile.net/proofs/artist/5f81060f-9aa4-4b10-ad28-15186689212f.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 0xe248b3a00855f4dad9788618534c53378aee995d4807a58175e6af402b3cbb30. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZTAZ2297761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe59f75602b40a4783fa4b050f4a9eb94fbb35f94ad1fec421c8144ff7b4e2b0f. 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/QZTAZ2297762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c5316bd2c9f54def2fb081e02ef12aa1fe99318f963a3f438dc1d4ff9842b91. 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/QZTAZ2297763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc77153cc7aefeebd44b1d01ba4d35b1a709519a65edbc005be25ae662e8dd95. 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/QZTAZ2297764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de1adf3691a2d78a070042fd60e1de2cabd04068cbe3743e265ccdbff691de7. 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/QZTAZ2297765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22d71ee963418c1e87f2ffd8477779babb652dafcf164e130ffe65186d775dae. 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/QZTAZ2297766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe14b67d9950544df2d5f6bb4ac1e10a0cd7b03671f925153361595d4642a4f17. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QZTAZ2297767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10d7a049a915cb37fff59537e044229132226d6c82062746eb84aa49238b3af9. 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/QZTBA2450538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba9b51caed04a4ea5cd281a42092d0f6d24ae5d5e7fa4eabc30c8d33b5bd3439. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZTBA2450539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f01fb8b201c74849d65a2dab0856ddc24607d7d1b5c3c0b1a34d245c826b89. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZFYW2011173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0275bfbc7afc477aa0bb7bf2f2c4b64b70c8d67082d373d8c8a9872f6b8b166. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QZES62414145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02eedb87d4b51b0bcb5f389b472cf16bd1365f6fcf12d55da68b5dccc298b5e3. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/BENG52300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf30a84c9db7974f279773a7a31ed691fbae76cf5defdf8ec75cf3eb69586a726. 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/BENG52300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bb03901e013c81463e830b70f722ba9085b61f0303cbe87d5a6c6c533223577. 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/QZK6P2560713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55b9695b281edf63ee93fd7062c00fa94e5c32d1527fabd2bcae8869596b5f68. 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/QZK6P2560714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17a76f784d2863daf6eef5bb718a20b67c0f5e50012959be62533e88e3a0de0a. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZK6P2560715.