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 0xa05171de741e82e7f0d97e183674ea75463b5f2cf4a28e80bfcafdb15b9cf91c. 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/8f4f727a-1297-4ba7-99f1-800b3b878cb1.json and https://artists.proofprofile.net/proofs/artist/8f4f727a-1297-4ba7-99f1-800b3b878cb1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x6cccec1f55d8b52776ecc4654dea3da9798fb7ed8b932109f51020a7fc2f6cd9. 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/USUM72213272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x075aa01e2715b9f4a840f38bf5684eae13f999e09c067563954b2b81af75410a. 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/QZGYN2400168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e43d15830cd2889eeab945b436cd5adc8ab175fcd85e04ab76b985e9e037956. 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/QZGYN2400169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71e2be2784f7c60a23f1d3cce4e1487c1c18844475ccec92fa47791ceb5fae2a. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-21T17:35:50Z), 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/QZGYN2400170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8035bc514a38d39a4f76e8e061b610a79e5bb16b24417d3b8ffa779d56ee8c0f. 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/QZGYN2400171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa25f6ad548913cb817f84a994fc89e61f97b66374b86c28b70716b2ef2db7826. 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/QZGYN2400172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf2f9ded6390c61cb349102df6ace03c15676152b3ec5d4dea755cde0303520c. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T08:47:39Z), 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/QZGYN2400174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf609201970ede509dbe2c5f51da98b49705cb73a346a23b275fa83d7b7276290. 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/TCAEP2037331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x610d360ef5bbc08e4caeb0c43314c8fcc3eecdf3d74a7348cf0e5c0d39614959. 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/TCAEP2037334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57547d739575b6c0862d12449b8a7f6f362b26c4feab472f56c5d69440dab39e. 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/CH7811113314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50c4beb563cd2c1ed02e70e24fcff68a026d67ec8d440e83fbef536af941f990. 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/CH7811113505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4256be6d486020c8e7f484434800405be36b87d6e2f541166af09352a0acbcfc. 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/CH7811113316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640e94a9bb1dc15b9c47eb6453ac572dd670392f4af3cca6a01133b43c2be324. 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/CH7811113317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e43d15830cd2889eeab945b436cd5adc8ab175fcd85e04ab76b985e9e037956. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZGYN2400169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29779eb0050b3909c6b606d27a3970e2b43b655261d6d9fc10eda4f69f6203d6. 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/USLUU2300197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0698eb1a318dc3e94eaebd4fba3c2edc51057a601d8061227e5f4debbd306c7c. 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/USLUU2200970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1732028949dde19e047dbf9024dfbbe11640d1f58ca37bcba06e560361932008. 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/QZES62212811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a494dd31932619bb24a81c44c28c587b097890abccbb33bf3d5918cf52bc07. 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/TCAFP2143717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3a34a7834e802e9d7d2241b16ce9d92f65419ff9c83ad6dab192c9493eba88c. 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/TCAFP2113400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4718c6b3d51819b8074c5e29c277a26c58adc565bf40994b0b9d9a1f3558a9a3. 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/USUM72105616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4718c6b3d51819b8074c5e29c277a26c58adc565bf40994b0b9d9a1f3558a9a3. 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/USUM72105616.