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 0x0d6312a0b903aa05dc780a56bf2a24bc23981588c609f017917733d53d03e261. 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/27accf0b-c468-4eaf-863a-abe577978a2f.json and https://artists.proofprofile.net/proofs/artist/27accf0b-c468-4eaf-863a-abe577978a2f.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 0xa1af5e48854cc59399bfb80297f436c01e12340d14c2beb1d118038337ad9759. 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/USUYG1244707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f44e9b7e432c4e8e4bfd4d98ce24c2188cfa4bd4b5551cf3c97e31b014ee7ff. Chain 2 (Bitcoin): anchored in block 957522 (2026-07-11T04:46:56Z), 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/USUYG1276036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x295b16aba9ab536ee7ef519bd1e7c809ce58b851852b456f2dd3d07061970cfa. 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/USUYG1332375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf16f7cdfd97d14e8c96f70a28e683e653f4a90875e75abafd42ce971051e78eb. 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/USUYG1358408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeab052d5ed091706eceb7ce58e188f5acc666cb686c175608625b9b785be4be6. 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/USUYG1362737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd60e8ccc67cee5526458d5c0fc6e5f29c768943272963666c357352ee57130e9. 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/USUYG1384180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d08c9a4cff164bdb90e4937f351138154f7069c758054721cce0d97b4ef17a. 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/USUYG1442199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42f718e544dbab408f1014c58ff3431d39b3b38c4a656b50ffb320d12b403ad3. 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/USUYG1469951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57d0df36eb83e80fd0bc04ba938c159f81035732127420d9b9133fae013ff3c4. 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/USUYG1489686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c1735d1101b7909fabd79b1c1d010f8a930203eea191170061204f08e677342. 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/USUYG1494413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x448a48418eac84fd53132711a20fdd664e7e5e75492b23842d348f713e2e4ccd. Chain 2 (Bitcoin): anchored in block 957959 (2026-07-14T05:54:20Z), 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/USUYG1505112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5acb3e726f84ba77dfb43c3166c1aa90e5edc9b2383ab9cb7aad8a129be5ec6f. 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/USUYG1544367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb027eec215cf573a061b8e4e4a87780d59314b382421177d349084ec44d89fdb. 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/USUYG1544370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x261dfcbf085632138cb0acd72580fbeeb5d791b48d5a86120c1cebc0f1b7f370. 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/USUYG1535347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9ab61c4c3859e063fbeaf52d20ec4ca735304134a5f422c6406a2d4133b4895. 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/USUYG1559260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2318c116919f45a64a49ef3a6edb5b52659d6e33b2f99c8b376b81f4cad3572. 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/USAT22402332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1354e8b7c8e656ca4203953718505a9219d9ef10df06ebd30100abb6fc73f4f2. 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/QZFZ22316846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fe80a2b4289fe09c2fbc7bd3d03bdf48aa6b00f77d7bdebf7266db76e103fbd. 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/QZMEN2281872.