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 0xf9e8466b1f50606d2d56a5a331a3ec38f2c4be4f8138b3554bc84911f5f1e2bd. Chain 2 (Bitcoin): anchored in block 953918 (2026-06-16T08:55:04Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1abdae98-f481-4429-945a-e66d9def5d86.json and https://artists.proofprofile.net/proofs/artist/1abdae98-f481-4429-945a-e66d9def5d86.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 0x7e159da7d44b1ac0f1c18aed81e0440dbde6777edec808c849185d1bcc8a914e. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/QZFZ42159276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae46a72d7c6f577ce2782170d1ca2dbff2c5f54c92a1b0fb58f6b66f6312a80b. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZFZ42159277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x148dd2190b6089cc34d139a11a0c28671cb58134e310e826837b816c22023920. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZFZ42159278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc101b2cd59dbe4de7fb157d02751aee93a0eba92f2f32bfaf6503d43dbb948d1. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZFZ42159279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x447033b19c05dbbaf3f0f20a347e3990382d546c3cd1d1f94e8e8fc8d027c406. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/QZNWY2086279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x024baece69169a613fee5616e4d4697078d54bfb391a7a74351efea9b20ef3de. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZFZ42159281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc41d1960df31daeb0aeab35cf211460a46a32cb140a8fe0e7c663c901f7e09d. 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/QZFZ42159282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc58240a89b15a3b7d08ed0a00bdeccfb427e481d40a4a87c3419b71cef0203d6. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZFZ42159283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe421473ec871b184dee9d6c262e98ff9ab44efc01f4eedf6c1b025d4fec2c3cb. 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/QZFZ42159284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f72ea97f8d0dd6103ed9aa25db816eedad4d750fb215fab34a984b715952f08. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZFZ62389402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa40e0c66348c78d9f94f1154dfa023c7e5babdfdf1eea5f98ece8ba98223721a. 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/QZDA42314708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfca55d0db6217dd6f8cd668edf6c8d8a6de03cf18b7abaaf9199ce3dd97bd702. 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/QZDA42314709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26b97969fbd4096043495f261aec002afe743abe23c374eb1f8b83afae088767. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZDA42314710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f72ea97f8d0dd6103ed9aa25db816eedad4d750fb215fab34a984b715952f08. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZFZ62389402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dea9a5db1abf75a51be8cdba38031a2081337caf2a0070b364db5fdf78ce80d. 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/QZFYX2306150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77f906593c866c492b4ff6ed7f7f16e4d2ae79a819cebfe470af9a477b43371b. 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/QZHN92088199.