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 0xeec0e302d46fa2178e2cd088dd4136324bc4d43adf6489f5adbd486d51c6784f. Chain 2 (Bitcoin): anchored in block 953667 (2026-06-14T17:49:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5801c09d-8a07-4f5d-8fd4-73a4cd7e951b.json and https://artists.proofprofile.net/proofs/artist/5801c09d-8a07-4f5d-8fd4-73a4cd7e951b.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 0xca66df944aa5bbe926eebff3956cd4084a66d7bf2baf187f7c53bcd451ad1dd1. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZES52222927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63e3e715b934f1f8a3f1bde637694c9db8123018439ae3c3d345a84b5b3eabd0. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZES52222928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1da9951569f50eb8a656fe1124e18f5e212d3c36c1c9db60286e2c18205a8df1. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/QZES52222930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5259d7b8534594127e3e70a613ffb5013587a3fc4e54283ed90360e84ccab71. 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/QZES52222931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa931bd720b745ac436b33b8b77c492cd1829645db1e210bbb5ce77cf7b44b0eb. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZES52222932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17c2200db5a34ae4a80eaa954c579e638260516a527ba0ed49c5fd129aebe8a5. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/NLZ7B2300411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x384c10d1150c1a99076714ea0d8d45838835b15cf0c44373e2f9da31f1ac4021. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/NLZ7B2100198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x976adfe630df31471de8943963c1ab3bba9629bb1ac61086dd79f64b7358a58c. 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/QZPLR2101917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd09e282b3faec86b1d7226bf47f796fc5a713c1445259a8a434010467fb5eb86. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZPLR2101920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f40f1519a25aa28a176ea18830fee5e1b51b3066c0bb3078b44b16f7356f121. 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/QZMEM2164899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cad713e117cf7acf7449be3f4ca610b8868f8e1184fa5d6c2db386ccf56c101. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZMEM2164900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24b3bf5cd54796bdd4923030b23bb16c545f2ce7b8629a8f6988b2bfcc98e730. 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/QZMEM2164901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x723da3bedc85e172ee236c28895005e9018a9646fbfb819f836fc2deace72a15. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QZK6Q2592262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1529a5c362efb8273f417c660ff0d2edde685f25cad0245bc9ac6e4b5d9456b4. 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/QZK6Q2592263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeb87dcfb8b7bea34bd8ed558c13a2b5356809f130832bb522504672b805b556. 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/QZK6Q2592264.