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 0xaa67c05916dd4719290568be971175bea39f8436d23bf4a4b69b43157883c3fa. 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/d1dc76a2-5f7c-4c9a-81d2-f663f40d14c7.json and https://artists.proofprofile.net/proofs/artist/d1dc76a2-5f7c-4c9a-81d2-f663f40d14c7.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 0xb0b39e20cb3e27414ec48759698175b6232c58c8d28130ffb69af07f4380c512. 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/CNZ502000594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2461a07c3008125697fc0ab6e53b94adf8d0c169dbecfa15ce04c67f9a189cd3. 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/TWCT52324694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17e782e1162bd7cdc853c176367011f5f70d9a3491dc440b31dc069738a92aa6. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/HKE022200123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x068fdfe5ee7a09354238904838c67656afe40b84c0dbf5ea9d6f0335bee9739f. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/HKE022200113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3652c9f899e716da1932d0b8d4cc6bb7e1cb7c8614907ed84e4794a9cbf2299. 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/HKE022200111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93229346435bbcf8109c67d9ecc3777db2af3107f291d81784ba40cd5d86d824. 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/CNZ172200126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf32062c6b67eb746ead2100862d3c0ba1117f1ec22eee3e2bb1d7476f474e64d. 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/CNZ502201249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6ed71eae80479027c74b0bd38e9b50ab74ba8be9386af17d68dd1d893761dfd. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CNZ502201173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4946bfd7a052e608a71814c25984f47048d11495710775760c2c31e0c6b65ed8. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/CNZ502200977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa768e5434deabf3281634066fc621b06b3aadf88b255b70d4bb25395e93f2f32. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/CNZ502200949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d033306a0a822933a25bf86e115984e9957ed2ab01cc12cc3f7269853932d7. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/CNZ502200115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88e2b01af97f1a3edb279d9b8899da08fa65eafa9a8a49b7896b23d6c8735c13. 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/CNZ501900939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15474d27ae3247795824863eb9c1c82396d36a949da8f47576d2fa8d965356eb. 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/CNZ501900933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6fbedd5c80c8ab6d7dccd57a6b06c1c6e6d59423f7f4206d3c53b87338150ba. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/CNZ502000827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x484014f3917ac602bcd2f621799d25a1440861bc3da702fbb5cd334fc60f00a1. 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/CNZ501900953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6602ea6e1ba733d55358d77d26fe2a370be1f5e2a008401969941686d16c9594. 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/CNZ501900960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ec9dd3031ee2d7700e7b6e63835baa5bb053d6a70f4a02108282f3cd3b2a15c. 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/CNZ501900954.