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 0x24ad868dfb5433f8e32dacb12e24f674e674b953cc993eeb828a97502e30c654. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a185fdfd-3f51-4e0f-81c7-584703a1adc2.json and https://artists.proofprofile.net/proofs/artist/a185fdfd-3f51-4e0f-81c7-584703a1adc2.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 0x4bc1153549fd5884dccfa547930a4ca06899d35cfaeceb690c201ea4234ae444. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/UKR4Q1933056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d5d65f270b55a69fa1df3d128f20c9892bccb3ee3aa33d3cf61f685a02b06b. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/UKR4Q1933057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x126009944200295cb572376e53a449d5b01c875a0aa70163c6e4e8c28b43e7c4. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/UKR4Q1933058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0319f3ed8e83d954fa881a5446a8a4d75628d7f5ae1001271c1b313440b95b5d. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/UKR4Q1933059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8da891ea7f6f027c78b8cac867519c259ea6ad82d1487271c458e28bf4508932. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/UKR4Q1933060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3036b93f78d43ac1421986c0367d1af5abd5c93ed8ada0cfac241923025896a2. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/UKR4Q1933061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a9f3585db12d3dce1cd5f813c342dbbfe83f3d44b3cddf0e4309fbe6cbaa395. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/UKR4Q1933062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a846d5f7be2e5f37cc83b16b8084c3fbcfa42824736f9a24047b9c684a9edb0. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/UKR4Q1933063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69b054c1d052f1be4cb4de62c64b4864c9c18c5c5075443eb495f193047ccaad. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/UKR4Q1933064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d7aac8e0db44f5f7526ee659bab76d55f4da4599d6401779b717f42ae63af06. 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/UKR4Q1933065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x173d03190a6a75c49af1923864c7b7f1879cc0407606249d95b6f857d5c56694. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/UKR4Q1933066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf49b1ddad4114ea11bb3691add84698041bf2c021b2910468c7cca100723c27d. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/UKR4Q1933067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e5170e51e816605324b06bb14d62b1cc210d1ec29e1e578613b4e940e80bc65. 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/UKR4Q1933068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x179e6d38404fd5c27cb2fcf358ce09f3f434c3b6348d991e79f8540f180adc3d. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/UKR4Q1933069.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7702aa6446e12316bebae05d97977531e6d2fed2fb6e4d4950d8ec178d2f4d32. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/IEWWH2466970.