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 0x9bd9cd511d3682e74dadcccca123a9d1498970d2223aa780d44ba215acbbf16d. 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/d651fca3-8fa2-4a5f-b682-d50b11ef8e33.json and https://artists.proofprofile.net/proofs/artist/d651fca3-8fa2-4a5f-b682-d50b11ef8e33.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 0xe36e56a7748a1eaf25047c5fa4e94639cb406f9103686ca8e0001e0bade0329b. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/PL41D1900079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x688b0fe60134eea44f5dfce676aa6e0f53cf8b184b953333fe4375895b056008. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/PL41D1900082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ccbc2af23520b14b656681b5d99a37bf1f5bd0aa9d37bc2347b44fd240bba38. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/PLA391360601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67ad9b440c4b5705a0fe53aebdf6efa9fcfd795d35a00017a6f9b395fbd98371. Chain 2 (Bitcoin): anchored in block 957892 (2026-07-13T18:21:16Z), 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/PLA391360602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x429206d64825209c4353f9ce6c36b58abd508085c86682da389eb0c70f760036. 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/PLA391360608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9df46770c1670844e5207a666845faac229d46892474f2b138c3a00df701c95d. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/PLA391360609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b0b21cf84837d249a6f676c6b413a958ff25a2886900fa5bd1a973cc9924309. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/PLA391360611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36392ff13540950bd9abb60ee0c27abb6d089491415af7c0d3451e058a8c2a75. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/PL68L2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbcc4ac5d8833817947017053ff6c694a8a6bd4acc44dd86685144dfca063444. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/PLA391488608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd9ce593fa282507b0f9f66f7815abe7d4a7037ea926b8072781af48d062fa4. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/PL0981500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49f0cdce8013d8d950ad34d9cc358fb777878bb47354e556542c321fa13b1c45. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/PLA391360111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a98954ba40ba56f77f680ce3e2933d23eae64ad35ba8ce53f6fb5a3883c47c. 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/PLB381200224.
Alex Band Aleksander Maliszewski - Polskie Przeboje 80
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6558c308ef57857b3a45f2d78fcaa4c0f0fa6e7be1719362532af7aed122f15. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/PLI531400070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbcc4ac5d8833817947017053ff6c694a8a6bd4acc44dd86685144dfca063444. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/PLA391488608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebb3db4f78d4a4cb207b1594ecb2be51cf8ce338c8780d4b7b8869e4ae04f240. 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/PLA391591712.