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 0x42d19928476de58930d0c592475acebc589000be91020b0182db571485854607. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/489bded5-00ce-4a88-8b5c-101adbc82dec.json and https://artists.proofprofile.net/proofs/artist/489bded5-00ce-4a88-8b5c-101adbc82dec.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 0x95ec0d8b8e484e2cd27653161a03383cea6ff8773295b77951278f2b7e4b5ec9. 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/TWK230902101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4380f238c7ca3949541ceb8352400d4fd09766d3103029254fc16a10dfbefc0d. 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/TWK230902102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92b1da46860f4ab63f7867b7411cbbbe89ef021cc2a654b018c77b5533d2ff86. 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/TWK230902104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa694438233333e45bd0a482274dfc01b9aba5ef5257f57fadcd7bfe8812863c6. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TWK230902105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05e0e001226856cde6d54005d0613fb062cae043840135b83720f6e0afd827ec. 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/TWK230902106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70e1fd3255e85ce198a516567c8a7174e53152a66cd66738c3d67845ccbfb100. 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/TWK230902107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c48293d981a86d74dc77ace10fbc9d9d21ed7cdcd1ba34222c3e1e877efe046. 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/TWK230902108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94294324274724e65bf71cbb652e7f4c6f241e9a4d11a244e768f89a2a53cf27. 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/TWK230902109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7183eb95441b793a6d6e152aa4165a8e331fa57047b696aa3eb89939d256c4fd. 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/TWK230902110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x121acda1720c28f17b5280e1f579ad5f998d9b33c5ed602cdac823b3cfc53243. 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/TWK230902111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee881eec043f1be95c5315c7d23e5070d3b188dbd3e2520527e4635bf7b7ca6f. 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/TWK230902112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2848f9dcbab2ff4e70e7a2039187272e5c457aa4334a1b8881de078fa31f483. 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/TWK230902113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9174e6d4376a95d26d6115eb8f5be1dc3b3b1a47fbeee9f5dad156bc56a7122b. 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/TWK230701003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa638d7d1922d0c877e877637363a5da2f3a78dda9f1ee25bf16ca0fe4d98b68b. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/TWK230902115.