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 0xf7ba6b6867ab3568852c5317f953c7d93cb40f66e30ebd4c3a7d752fc7f8f3b1. 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/09b61ec3-29a7-4c32-947a-1d76b3feba39.json and https://artists.proofprofile.net/proofs/artist/09b61ec3-29a7-4c32-947a-1d76b3feba39.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 0x72d793a695e1f39ca8eac03b4dc0999b1b3740dee782f57d6aeccc582e33ae11. 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/CAGOO2153787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x689d9bc5a9bb9c8ac05fb32345dc6c2e8edc246756e259bdce1ff6c881470016. 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/CAGOO2153790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6674a5dae23517b0406975ef8e819f98f95f63280259725409239882f5d20aa4. 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/SE6SA2338539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x830e1ed610a3b3ed491e65db94dace6218938b4bc188023bee5436736a448d24. 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/SE6XY2320035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7446fc562dfacbbea94edac27f7529455be0e6bf8e9144de54d0187c849681bc. 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/SE6SA2355304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8810fb16f89df1681e575fb1f344f2d6a5a289978d2fd5baa25fa70594a3768. 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/SE6XW2342911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e79b3dadbf7f8b1d809dd5773d8b86db17818c522695907e0d8409e50a571e6. 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/CACWV2317716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x256d2757e86245d9e16833d5d47f568c5de592c241ec3abec32e521b2764203a. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T10:02:50Z), 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/CAHQJ2396421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd846c2ad636cb43f7c097370df932ad73dc688992cffe26316e129bd65e4b809. 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/CAHQJ2394558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6de751d79899e55f162aa4f47a1dd01ba53ef6394b189864967594133c9faeb6. 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/CAHQJ2394465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91bca20bd20f939c45bf9dc329dc9aa07162da45f16132030f9518445d84bb66. 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/NLT2H2100509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c470fc36375a21ad1cf4de5cb79d5eb2f60593f886e364c18962e7fc186b63c. 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/QM7282073927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39beaaff731ec8bd2bacf768d163d6bf2f3413cdf91e4922a81b81e7bf56ccf7. 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/QMDA62202910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36fc4f6d264835800af96e14579a7f3bee9a7ad61983506e46fc40daf6e9f6ad. 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/QM4TX2181586.